From hbr@mailman.qth.net  Fri Aug  1 05:44:30 2003
From: hbr@mailman.qth.net (Hugo W. Catta)
Date: Fri, 01 Aug 2003 00:44:30 -0400
Subject: [HBR] Fw: Building a HB-65.... (sort of)
References: <3F29635D.19303.1CE83EA@localhost>
Message-ID: <014c01c357e7$98f857e0$45245643@dell2000>

...snip....

> The only thing that might be an issue is the change of mixers.   A
> 6U8 will certainly work as a mixer but has much lower gain than a
> 7360 or other beam deflection tube.  Looking at the HB-65 diagram,
> you have two mixers, one IF stage of modest gain (6BA6),

....snip....

....TWO I.F. stages.

a no-gain
> 2nd detector (solid state diodes) and a moderate gain AF amp.
> That's probably not really enough gain if using a pentode instead of a
> beam deflection 1st mixer -- you may not have enough volume or
> decent AGC action.  I'd consider using a 6BA6 RF stage between
> the two front end coils

....snip...

> A second issue is that a beam deflection tube provides better
> isolation between the VFO and the signal path than does a pentode.
> You might want to consider using a 6C4 as the VFO and making the
> triode of the 6U8 1st mixer into a buffer.   Otherwise, voice signal
> peaks will tend to pull the oscillator off frequency and cause
> distortion.

Unfortunately the limitations imposed by the lack of space and transformer
power don't leave room for such alternatives. Also the 20-15-10 M converter
is out. 40 and 80 only. And on these bands I am concerned more about strong
signal handling rather than conversion gain. I guess an RF stage will
further "soften" the 6U8.

BTW; the cabinet is from an old National NC-60.

....snip....

> The HBR2K project has been shelved the last few weeks due to
> outside work, a family wedding, and other such trivial non-homebrew
> activities;  I'll be back to it shortly.

Is there a site where to see pictures/diagrams/circuits of the HBR2K ?

Thanks
Hugo
AA1XV




From hbr@mailman.qth.net  Fri Aug  1 06:07:03 2003
From: hbr@mailman.qth.net (Stan Wilson)
Date: Fri, 1 Aug 2003 00:07:03 -0500
Subject: [HBR] Super Gainer
In-Reply-To: <3F29635D.19303.1CE83EA@localhost>
Message-ID: <000001c357ea$bf2bfa40$0101320a@CPU>

Has anyone built the Super Gainer receiver from the 1937 Jones Handbook
?  Interesting circuit since it employees both regen and superhet
circuits.


From hbr@mailman.qth.net  Fri Aug  1 11:03:39 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Fri, 1 Aug 2003 06:03:39 -0400
Subject: [HBR] Fw: Building a HB-65.... (sort of)
In-Reply-To: <3F29635D.19303.1CE83EA@localhost>
References: <002601c35797$0d725220$45245643@dell2000>
Message-ID: <3F2A02BB.21805.2E32A4@localhost>

I wanted to make a couple of further comments.  First, that I actually 
*do* know how to spell toroid and I am now going to teach my 
spelling checker.   

Second, I think that Hugo's HB-65 project (with a pentode replacing 
the 7360) makes an excellent 'first serious receiver' project.   That 
design should be stable enough and have the dynamic range and 
selectivity needed to be perfectly usable on 80 and 40 meters; with a 
good crystal controlled converter fronting it (as in the HB- 65 
handbook article), the sky's the limit -- certainly it would go to 10 
meters.    

At the same time, it's free of critical circuits except for the usual 
issues with a VFO -- in other words, about as free of such circuits as 
is practical.   Using double conversion with a couple of 100 kcs 
transformers for selectivity rather than a mechanical filter as in the 
HB-67, it's easier to get avoid leakage problems and the higher first 
IF (compared to 455 kcs in the HB-67) is an advantage.   With the 
gain and selectivity distributed as they are, the problems of a beam 
tube gone, and a fairly low parts count, this design ought to find a 
place in many 'homebrew station' setups.  

We'll be watching for pictures and further reports, Hugo!

Walt Hutchens
KJ4KV

From hbr@mailman.qth.net  Fri Aug  1 11:58:59 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Fri, 1 Aug 2003 06:58:59 EDT
Subject: [HBR] Fw: Building a HB-65.... (sort of)
Message-ID: <2b.452a7adc.2c5ba1f3@aol.com>

In a message dated 8/1/03 12:48:08 AM Eastern Daylight Time, 
hugo@optonline.net writes:


> Unfortunately the limitations imposed by the lack of space and transformer
> power don't leave room for such alternatives.

I've got bigger transformers. What voltages do you need?

 > 40 and 80 only. And on these bands I am concerned more about strong
> signal handling rather than conversion gain. I guess an RF stage will
> further "soften" the 6U8.

Why not a Pullen mixer? More gain, good strong signal capability. A dual 
triode with a 300 mA heater for the mixer and a 6C4 or 6BH6 (150 mA heater) for 
the HFO, so there's no difference in power requirement. Just one extra tube. 

Let me know about your transformer needs. 520 VCT @ 90 ma work?

73 de Jim, N2EY


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From hbr@mailman.qth.net  Fri Aug  1 12:25:44 2003
From: hbr@mailman.qth.net (mike)
Date: Fri, 1 Aug 2003 07:25:44 -0400
Subject: [HBR] Super Gainer
In-Reply-To: <000001c357ea$bf2bfa40$0101320a@CPU>
References: <000001c357ea$bf2bfa40$0101320a@CPU>
Message-ID: <200308010725.44476.mike@kd0ar.homeip.net>

I built something similar, from the 1942 handbook I built a RX that used =
a 6K8=20
followed by a 6C8.  The 6K8 was the mixer, the 6C8 was a regenerative=20
detector operating on a fixed tuned frequency of about 1700 kc.  One hint=
 if=20
you build one of these, use a fairly high C tuned circuit in the regen=20
detector, stability will be better.  It worked VERY well, and I used that=
=20
receiver for about 2 years when I first got started in BA operating.  I h=
ad=20
acquired a Phasemaster TX fer $1 at a hamfest but had no RX to go with it=
, so=20
I built that radio.  Worked AM, CW and SSB mostly on 160 and 80 with that=
=20
setup.

Mike, kd0ar


On Friday 01 August 2003 01:07 am, Stan Wilson wrote:
> Has anyone built the Super Gainer receiver from the 1937 Jones Handbook
> ?  Interesting circuit since it employees both regen and superhet
> circuits.
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
> http://mailman.qth.net/mailman/listinfo/hbr


From hbr@mailman.qth.net  Fri Aug  1 18:01:31 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Fri, 1 Aug 2003 13:01:31 -0400
Subject: [HBR] Fw: Building a HB-65.... (sort of)
In-Reply-To: <014c01c357e7$98f857e0$45245643@dell2000>
Message-ID: <3F2A64AB.26386.B5F41D@localhost>

Hugo observes:

> ...TWO I.F. stages.

Arrrgghhhh!   That's what I get for taking a quick look at a circuit.   
Well, I was only off by 50%.   

Having looked again and counted more accurately, I don't think you'll 
have a problem if you replace the 6BA6's with 6EH7's.  These tubes 
not only have higher gain but also a much better characteristic with 
large signals -- they were about the last tubes developed for TV IF 
service and they are *good* -- as well as cheap because they were 
never much used by designers.   A 9-pin socket is required and the 
plate current will be a few mA higher.   

There are even higher gain IF tubes available but I think you won't 
need them and they're more likely to lead to stability problems.  
Should more gain be needed, the 1st mixer is the place to get it -- 
there are higher gain versions of the 6U8 as well.   But I wouldn't start 
there.   

Using toroids for the front end coils will give you more gain there -- 
because higher Q (than the standard Miller coils recommended) will 
give you more voltage step-up from the antenna.   You also get better 
rejection of unwanted signals which will make the mixer happier.   
Downside -- I'd plan for a vernier drive on that knob, as it will tune 
*very* sharply.   The only ways to beat that are to reduce the Q 
(back to Miller) or use a bandswitch to change fixed caps (and/or 
coils) and a much smaller two-gang tuning cap.

With a little more chassis space the easy way to get even more gain 
if needed would be an IF stage at 1700kcs, stuck between the two 
1700 kcs IFTs.

The one remaining issue is the 1st oscillator.   I'm pretty near certain 
that you won't be satisfied with the SSB performance unless you 
provide a buffer.   An unbuffered 5200-5800 kcs oscillator just isn't 
going to be stable enough to avoid pulling on signal peaks.   I think it 
will be okay receiving AM or CW but on SSB you'll have noticible 
distortion.   Of course SSB may not be an important design goal.

I built a somewhat similar receiver, about 11 years ago.   No RF 
stage, 12AT7 1st mixer, 12AT7 VFO/buffer, 2x12BA6 IF stages, 1/2 
12AX7+1/2 12AU7 plate detector (complicated 2-tube circuit -- 
overkill), 1/2 12AX7 1st audio, 1/2 12AU7 AGC, 35C5 2nd audio, 1/2 
12AT7 BFO.   No power transformer -- series filaments (voltages add 
to 117), halfwave rectifier from the AC line for plate voltage.   I did go 
with an IF of 5550 kcs and the VFO thus tunes 1750-1550 kcs, giving 
a receiver tuning range 3800-4000 and 7100-7300 kcs.   

Using the 5550 kcs IF you pretty much have to go with a crystal filter 
for selectivity.   I used a home made ladder crystal filter.   And 
custom crystals are required -- last time I looked I didn't see a 
standard crystal anywhere near the frequency.   $100 or so worth of 
crystals.   IF transformers, though, are smaller -- I used toroids, 
unsheilded, single tuned.   The 1550-1750 kcs VFO is a heck of a lot 
easier to stabilize than one operating 5200-5800 kcs.   So that is a 
design trade off.

The plate detector is set up to provide about 20 db gain.  That's how I 
got by with 6BA6 IF's.   Front panel mounted 2"x3" oval speaker -- a 
one-off part that I'd never use again.   I didn't provide a threshold 
setting for the AGC -- that was another mistake, as the AGC lets the 
noise come up between words.

Dial was from a command set control box tuning mechanism with 
home made face and escutchion.   Audio derived AGC as in the HB-
65 design.   The BFO -- stability critical for receiving SSB -- is a 5550 
crystal with a front panel knob to allow some tuning.   

I had a heck of a time with IF instabilty but this was my first serious 
receiver, 5550 kcs is harder than a lower frequency, and series 
filaments/line HV is a more difficult design problem.  It works fine but 
took weeks to get there!

I just pulled this receiver out, dusted it off and plugged it in.   It works 
fine, copying ECARS on 7255, solid as a rock.  Compared to the 
HBR2K, it sounds tinny but the filter is narrower and there's that tiny 
speaker.   The preselector tuning knob has an 8:1 ratio and it's none 
too slow.

Okay, so I was wondering what to do when the HBR2K project wraps 
up:  I'll take the R8040 receiver (as described above) and redo it from 
scratch.   The original was designed for minimum size (7"x7" 
chassis) and weight; if reoptimized for ease of duplication it would be 
a lot more useful.   For starters a more reasonable chassis size -- 
maybe 8"x12".  

My HBR2K pictures have been taken down; I'll try to get them put 
back up (probably have to take new ones) within a couple of days.

Walt Hutchens
KJ4KV



From hbr@mailman.qth.net  Fri Aug  1 20:53:40 2003
From: hbr@mailman.qth.net (Hugo W. Catta)
Date: Fri, 01 Aug 2003 15:53:40 -0400
Subject: [HBR] Fw: Building a HB-65.... (sort of)
References: <3F2A64AB.26386.B5F41D@localhost>
Message-ID: <000a01c35866$9b8ea070$45245643@dell2000>

....snip...

> Having looked again and counted more accurately, I don't think you'll
> have a problem if you replace the 6BA6's with 6EH7's.

When I was a teenager, I built my first Receiver with a semi-kit of
"Torotor" coils :

1 "block of coils" (3 per band) mounted with a switch.
1 1900Khz I.F. transformer
2 110Khz seconf IF tranformers
1 110Khz BFO coil
1 2010Khz crystal
1 S-meter (1mA)
1 high quality 3-gang variable cap.
1 brass cap for the BFO
1 Circuit diagram

TRIVIA QUESTION for the Old Timers:
What origin the Torotor coils were ?
I'll think of a prize for the first correct answer...
Clue: Is not China, nor the U.S.A..


All european tubes, and the IF amps were EF183 and EF89 (?)
I worked Ok on 40 and 80. The only thing nobody told me and in those days my
knowledge was poorer than today, was that a STEEL chassis is a NO-NO !!!.



they were
> never much used by designers.   A 9-pin socket is required and the
> plate current will be a few mA higher.

....snip...

Don't have the room for 9pins; don't have the extra mAmps either.


>
...snip

>
> The one remaining issue is the 1st oscillator.   I'm pretty near certain
> that you won't be satisfied with the SSB performance unless you
> provide a buffer.   An unbuffered 5200-5800 kcs oscillator just isn't
> going to be stable enough to avoid pulling on signal peaks.   I think it
> will be okay receiving AM or CW but on SSB you'll have noticible
> distortion.   Of course SSB may not be an important design goal.

The companion project of course would be a transmitter..... 40 and 80 with a
1700Khz IF.
This way I could use a REAL VFO injection from the xmtr.

Plan "C" could be also to cheat a little and use our good friend the MOS-FET
as a buffer - amplifier stage after the triode HFO.

...snip...
>
> My HBR2K pictures have been taken down; I'll try to get them put
> back up (probably have to take new ones) within a couple of days.

Looking forward to see them

73
 Hugo
AA1XV




From hbr@mailman.qth.net  Sat Aug  2 02:45:48 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Fri, 1 Aug 2003 21:45:48 -0400
Subject: [HBR] HBR2K Pictures
In-Reply-To: <000a01c35866$9b8ea070$45245643@dell2000>
Message-ID: <3F2ADF8C.29635.10C426A@localhost>

They're at:

http://www.timbreblue.com/hbr2.jpg
http://www.timbreblue.com/hbr3.jpg
http://www.timbreblue.com/hbr4.jpg
http://www.timbreblue.com/hbr5.jpg
http://www.timbreblue.com/hbr6.jpg
http://www.timbreblue.com/hbr7.jpg

The first two are sort of 'historical', the last shot was taken just a few 
minutes ago.  (If it gives a 404, try again later -- it may not be up 
yet.)  The underchassis has filled up a bit!

Still too much going on here to get serious on it.   Dead computer 
(daughter's) and dying washing machine, fitting laundry and mowing 
around the alternate day thunderstorms ... winter is coming and if not 
before, I'll be back to it then.

No schematics yet.   Although I have drafted them, there are still too 
many changes being made for it to make sense to give them out.  
Just details, but they're the difference between 'pretty good' and 'very 
good.'

Walt Hutchens
KJ4KV


From hbr@mailman.qth.net  Sat Aug  2 21:06:31 2003
From: hbr@mailman.qth.net (Stan Wilson)
Date: Sat, 2 Aug 2003 15:06:31 -0500
Subject: [HBR] Restoring old receiver
Message-ID: <000001c35931$90f91b60$0101320a@CPU>

I recent acquired an old receiver from the late 1940s that is not
collectable grade.   Every cap in it needs replaced plus several  tubes.
It is a National and the  basic design was no doubt state of the art for
a AC/DC receiver in that era.  I am considering redoing all of the caps
and rewiring the tubes for a filament transformer and also using a
reverse filament transformer to generate the DC.   Other choice is what
to do about the detector stage.   My first thoughts were to replace the
6H6 with a 6BE6 product detector, but after consideration think maybe
the better choice is to restore everything electrical with the improved
power supply circuit and add a RF connector to go to an external Q5er.  

 

After all of the rework it will still not be a collectable quality
receiver, however, it will look original, and be an excellent test
receiver (and safe with the isolated power supply) for my work bench
that I can also use to listen to SSB activity on the bands or the local
AM stations.

 

Wonder what others have done in similar cases ?  Have you used a oldie
as the foundation for a HBR or improved one ?

 

de stan ak0b

 



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From hbr@mailman.qth.net  Sat Aug  2 23:03:33 2003
From: hbr@mailman.qth.net (Dan Merz)
Date: Sat, 02 Aug 2003 15:03:33 -0700
Subject: [HBR] Restoring old receiver
References: <000001c35931$90f91b60$0101320a@CPU>
Message-ID: <3F2C3535.B54533DA@3-cities.com>

Stan,  I would argue against spending too much time refining old receivers and
ending up with something that might work a bit better but will be of little interest
to anyone in the future.  I have similar radios that I have resisted the temptation
on "improving".  I've found that I can find an unmodified set of later vintage and
appreciate it for its features.  There's always going to be some maintenance duties
to make it work like it should without changing the basic circuitry to satisfy the
tinkering urge.  AC/DC sets are pretty safe,  particularly the ones made by
National,  Hallicrafters etc.   You can always use an isolation transformer for
added peace of mind and safety when working on them and operating them.   I can
appreciate that you may have what looks like a beater that no one would want to
collect,  though I hardly recognize the term "collectible grade" since for every
condition there's a price and someone who would want to have it at that price.  I
don't get too excited about having a radio that  looks like it was never used unless
I made it that way from something less attractive.    By the way,  I once replaced
every original 55 year old capacitor in a National NC-200  and found that the
improvement was nil over replacing the two or three that had obviously failed and
were causing obvious problems,  like hum and grid voltage. Of course, some of them
might have gone south the next day but I operated it quite a bit before taking the
plunge.   For ssb,  a product detector is a godsend,  not that it sounds that much
better or gets you more signals than a diode detector,  but because it can handle
big signals without distortion and is friendlier to AGC.  Don't ignore the agc
aspects of ssb product detection if you are going that route because that's what
makes it so nice in my opinion.  Otherwise,  you'll be riding the gain control just
like you have to do for a diode detector with weak bfo injection.

After all this,  I would say that it is appealing to make something perform better
like you propose - I'm probably not very good at it so prefer to work with the
original designs and satisfy my interest mostly in that manner.  I have done some
homebrew stuff but not too different than handbook published sets.  If I were going
to be "stuck" with the set you have,  I would build an external power supply (i.e.
isolation transformer).  One very good radio that is AC/DC is the Hallicrafters
S-22R which is even older than yours - it's only annoying flaw is a bit of
modulation hum on ssb signals that I haven't been able to get rid of,  gets worse on
20 meters.  Of course its selectivity is  bad but it's still fun to use.  Good luck
- I can't offer any advice relative to adding a Q5er to your set from my
experience,  Dan.

Stan Wilson wrote:

> I recent acquired an old receiver from the late 1940s that is not
> collectable grade.   Every cap in it needs replaced plus several  tubes.
> It is a National and the  basic design was no doubt state of the art for
> a AC/DC receiver in that era.  I am considering redoing all of the caps
> and rewiring the tubes for a filament transformer and also using a
> reverse filament transformer to generate the DC.   Other choice is what
> to do about the detector stage.   My first thoughts were to replace the
> 6H6 with a 6BE6 product detector, but after consideration think maybe
> the better choice is to restore everything electrical with the improved
> power supply circuit and add a RF connector to go to an external Q5er.
>
>
>
> After all of the rework it will still not be a collectable quality
> receiver, however, it will look original, and be an excellent test
> receiver (and safe with the isolated power supply) for my work bench
> that I can also use to listen to SSB activity on the bands or the local
> AM stations.
>
>
>
> Wonder what others have done in similar cases ?  Have you used a oldie
> as the foundation for a HBR or improved one ?
>
>
>
> de stan ak0b
>
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
>   text/plain (text body -- kept)
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> The reason this message is shown is because the post was in HTML
> or had an attachment.  Attachments are not allowed.  To learn how
> to post in Plain-Text go to: http://www.expita.com/nomime.html  ---
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr



From hbr@mailman.qth.net  Sat Aug  2 03:18:59 2003
From: hbr@mailman.qth.net (Tom Azlin, N4ZPT)
Date: Fri, 01 Aug 2003 22:18:59 -0400
Subject: [HBR] HBR2K Pictures
In-Reply-To: <3F2ADF8C.29635.10C426A@localhost>
References: <3F2ADF8C.29635.10C426A@localhost>
Message-ID: <oprs891xkb7wnqhq@mail.n4zpt.org>

Hi Walt,

Nice HBR!!  Thanks for the photos.  I am still collecting parts!

73, Tom

On Fri, 1 Aug 2003 21:45:48 -0400, <waltah@earthlink.net> wrote:

> The first two are sort of 'historical', the last shot was taken just a 
> few minutes ago.  (If it gives a 404, try again later -- it may not be up 
> yet.)  The underchassis has filled up a bit!
> [snip]
> Walt Hutchens
> KJ4KV

-- 
Tom Azlin, N4ZPT


From hbr@mailman.qth.net  Sun Aug  3 05:17:06 2003
From: hbr@mailman.qth.net (Tom Smith)
Date: Sat, 2 Aug 2003 21:17:06 -0700
Subject: [HBR] Brittish/Canadian HBR
Message-ID: <004e01c35976$19bb63b0$3580b4ce@tsmith>

I have a hbr that has become excess to my needs. I am in the middle of =
some heavy duty AM projects and don't have the time to work this =
receiver nor the space to store it until I do. I acquired the receiver =
from a gent in Canada and it is apparently a Brittish design (not the =
American HBR line). It isn't working but looks complete and with a =
little work can be made functional. It powers up and has audio but =
doesn't work on any of the bands. On the negative side there are some =
disconnected wires under the chassis and the chassis itself has some =
extraneous holes (but not that many). It will need to be recapped and =
the S meter should be replaced with a larger variety. Someone replaced =
the original with a smaller meter and used a adapter plate that doesn't =
look very good.=20

On the positive side, it looks complete, has a beautiful Eddystone dial, =
the front panel looks good (would look better with the proper S meter) =
and appears to be well made with quality components, IF transformers, =
nice set of matching knobs etc. I've been told the Eddystone dial is a =
rather pricey item. I"ll also include the Brittish magazine pictured =
below. The receiver isn't a copy of the receiver in the publication.

I would like to get my money back out of it. I have $200 plus shipping =
from Canada and would consider the best offer over $200. I have taken =
some jpegs and the address is posted below.

http://www.hal-pc.org/~tsmith/hbr_f.jpg
http://www.hal-pc.org/~tsmith/hbr_r.jpg
http://www.hal-pc.org/~tsmith/hbr_c.jpg
http://www.hal-pc.org/~tsmith/doc.jpg

Thanks,
Tom  N5AMA

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From hbr@mailman.qth.net  Sun Aug  3 11:18:59 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 3 Aug 2003 06:18:59 -0400
Subject: [HBR] Restoring old receiver
In-Reply-To: <3F2C3535.B54533DA@3-cities.com>
Message-ID: <3F2CA953.23428.1FDDB9@localhost>

Stan:
> I recent acquired an old receiver from the late 1940s that is not
> collectable grade.

This can be argued in both directions.

*For* making modifications.   From what you say the receiver is in no 
sense a rare original item -- as it would be if a historic first, fewer 
than 10 known to still exist, etc.  More likely tens of thousands were 
produced. There are lots of other examples out there, and many of 
them are in better condition.   The modifications will improve your 
set's performance.   Modifying sets that work is an excellent way to 
gain experience -- I'm one of the great beneficiaries of that technique. 
 

*Against*.   A receiver of that price range and vintage has  
fundamental limitations that make modifying it to get close to modern 
standards or even tolerable SSB performance pretty nigh impossible. 
When you get the SSB detection and AGC issues resolved, there's 
stability -- *all* such sets drift at least several kcs/hour, more or less 
forever.   If you allow it to warm up 'forever' and it actually does 
stabilize to the point of copying a signal for 15 minutes at a time, 
then you've got the problem of bandspread (usually 100 kcs or more 
per knob revolution even on lower bands, tho some sets have a type 
of two-speed tuning) and backlash.   The power supply is unstable 
and if you install transformers it will be worse.   The oscillator will 
move with any change of line voltage or (because of the variation of 
plate voltage), AVC action with changes of signal strength.  
Oscillator isolation?  Hahahaha ... you've got at best a triode driving a 
pentode.   Voice peaks will pull the oscillator, causing distortion.

That's all I can think of, but I'll bet I just haven't thought long enough.  
By far the best way to use a receiver like this to develop a good HBR 
is to strip the chassis to a bare plate and cover it with a sheet of 
aluminum.   Discard all parts except the knobs/controls, dial lamp 
and S-meter, cover the panel with a sheet of aluminum; the cabinet 
may be restored and used as-is ... 

As long as you are realistic about the expected results from one-step-
at-a-time mods and see this mainly as an interesting project, I'd say 
go for it!   It *is* possible to improve the performance of such 
receivers on AM reception considerably beyond what they did when 
new and there's still AM on the ham bands ... if you score much 
better AM as a success, you might be well pleased.

No reason to be concerned about the AC/DC design, although it 
does somewhat constrain tube substitutions.   Just replace the cap 
from one side of the line to the chassis with a modern 1KV+ ceramic 
designed for 'line voltage' use (Radio Shack has them) and replace 
the cord with a 3-wire type so the chassis is properly grounded via 
the green wire.   White wire is cold (becomes B- in the set), 
bypassed to chassis.   Black wire is hot.  Install a fuse in the hot 
side.  Before plugging in, double-check ground continuity from 
chassis to ground pin on plug and also check that your outlets are 
wired correctly -- you find some with the hot and cold wires reversed!  
You can buy a tester for outlets at any place selling home mechanic 
electrical supplies.

I *build* AC/DC sets ... they have many advantages for low power 
rigs.   The R-8040 described a couple of days ago is an example.

Walt Hutchens
KJ4KV

From hbr@mailman.qth.net  Sun Aug  3 14:27:23 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 3 Aug 2003 08:27:23 -0500
Subject: [HBR] Brittish/Canadian HBR
Message-ID: <20030803.082729.-250047.2.windy10605@juno.com>

Tom,

So that's a G2DAF receiver. Could you copy the schematics and send 
them to me ? I'll post them on the web site. What is the date of the
article ?

73 Kees K5BCQ

From hbr@mailman.qth.net  Sun Aug  3 15:10:25 2003
From: hbr@mailman.qth.net (Tom Smith)
Date: Sun, 3 Aug 2003 07:10:25 -0700
Subject: [HBR] Brittish/Canadian HBR
References: <20030803.082729.-250047.2.windy10605@juno.com>
Message-ID: <007801c359c8$fce3e1b0$3580b4ce@tsmith>

Hi Kees,

I would be glad to send you a copy of the entire publication but will need
your address. This is a reprint of seven articles from July-November 1960
and March-April 1961. The original publication was the RSGB Bulletin.

Tom N5AMA

----- Original Message -----
From: <windy10605@juno.com>
To: <hbr@mailman.qth.net>
Sent: Sunday, August 03, 2003 6:27 AM
Subject: Re: [HBR] Brittish/Canadian HBR


> Tom,
>
> So that's a G2DAF receiver. Could you copy the schematics and send
> them to me ? I'll post them on the web site. What is the date of the
> article ?
>
> 73 Kees K5BCQ
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>



From hbr@mailman.qth.net  Sun Aug  3 15:21:17 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 3 Aug 2003 10:21:17 EDT
Subject: [HBR] Restoring old receiver
Message-ID: <189.1d0b4a09.2c5e745d@aol.com>

In a message dated 8/2/03 4:08:56 PM Eastern Daylight Time, ak0b@swbell.net 
writes:

> I recent acquired an old receiver from the late 1940s that is not
> collectable grade.   

What model?

Every cap in it needs replaced plus several  tubes.
> 
> It is a National and the  basic design was no doubt state of the art for
> a AC/DC receiver in that era.  I am considering redoing all of the caps
> and rewiring the tubes for a filament transformer and also using a
> reverse filament transformer to generate the DC.   Other choice is what
> to do about the detector stage.   My first thoughts were to replace the
> 6H6 with a 6BE6 product detector, but after consideration think maybe
> the better choice is to restore everything electrical with the improved
> power supply circuit and add a RF connector to go to an external Q5er.  
> 
> 
> After all of the rework it will still not be a collectable quality
> receiver, however, it will look original, and be an excellent test
> receiver (and safe with the isolated power supply) for my work bench
> that I can also use to listen to SSB activity on the bands or the local
> AM stations.
> 
> 

Always good to have a general-coverage "bench" receiver for listening to 
oscillators, side-by-side comparisons, dipper checks, etc. My current bench 
receiver is a BC-342-N by Farnsworth. 



> 
> Wonder what others have done in similar cases ?  Have you used a oldie
> as the foundation for a HBR or improved one ?
> 
> 
> 

I used to do stuff like that but nowadays I favor simply building from 
scratch. Any manufactured rx has some custom parts that restorers need. 

I suggest first restoring the rx to original electrical condition to see how 
good/bad it really is. From that evaluation you can decide whether to restore 
it, use as-is, or sell it.

If you are concerned about safety, just use an external isolation 
transformer. 

As for Q5er operation, a BC-453 preceded by a crystal-controlled converter 
makes an excellent, stable receiver for HF up to 10 MHz or so (two tuned 
circuits for image rejection) or even 15 MHz (three tuned circuits). 

73 de Jim, N2EY 


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---

From hbr@mailman.qth.net  Sun Aug  3 16:02:17 2003
From: hbr@mailman.qth.net (Hugo W. Catta)
Date: Sun, 03 Aug 2003 11:02:17 -0400
Subject: [HBR] Restoring old receiver
References: <189.1d0b4a09.2c5e745d@aol.com>
Message-ID: <001f01c359d0$3bc9dae0$45245643@dell2000>

----- Original Message ----- 
From: <N2EY@aol.com>
To: <hbr@mailman.qth.net>
Sent: Sunday, August 03, 2003 10:21 AM
Subject: Re: [HBR] Restoring old receiver


> In a message dated 8/2/03 4:08:56 PM Eastern Daylight Time,
ak0b@swbell.net
> writes:
>
> > I recent acquired an old receiver from the late 1940s that is not
> > collectable grade.
>
> What model?
>
> Every cap in it needs replaced plus several  tubes.
> >

Every cap?
Do the mica and ceramic caps age as badly as electrolitics and wax / papers
?
I ask this because you don't see too many old oscillators suffering from bad
caps as audio stages do, for instance.

Curiously,
Hugo
AA1XV



From hbr@mailman.qth.net  Sun Aug  3 16:12:09 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 3 Aug 2003 10:12:09 -0500
Subject: [HBR] Brittish/Canadian HBR
Message-ID: <20030803.101213.-250047.4.windy10605@juno.com>

I have the 5th Edition (1976) of the RSGB manual which has a 
G2DAF Mark II receiver which is a 160-10m, double conversion,
16 tube (valve) receiver. 

Sensitivity: 10dB S/N for .5uV
Selectivity: 2.5Khz BW at -6dB,  5Khz at -60dB
second channel rejection of 80dB or more
IF breakthrough rejection of 80dB or more
crystal HFO (converter) for each band
absolutely minimal spurs
selectable AGC
AM noise limiter
frontend dynamic range of 100dB or more
Q-multiplier
mechanical filter

 
But I don't think it was as popular (due to the complexity) as the 
previous version which is what I think you have. That's another 
one "with many hundred built". Maybe someone else has more 
information or knows some hams to ask.

73 Kees K5BCQ

From hbr@mailman.qth.net  Sun Aug  3 16:34:09 2003
From: hbr@mailman.qth.net (Tom Smith)
Date: Sun, 3 Aug 2003 08:34:09 -0700
Subject: [HBR] Brittish/Canadian HBR
References: <20030803.101213.-250047.4.windy10605@juno.com>
Message-ID: <009801c359d4$af125960$3580b4ce@tsmith>

The original G2DAF receiver had 20 tubes (excuse me  - valves). One of the
articles suggested a commercial front end made by "Electroniques" (it looks
like good stuff) which is how my receiver is made. This receiver has 14
tubes.


----- Original Message -----
From: <windy10605@juno.com>
To: <hbr@mailman.qth.net>
Sent: Sunday, August 03, 2003 8:12 AM
Subject: Re: [HBR] Brittish/Canadian HBR


> I have the 5th Edition (1976) of the RSGB manual which has a
> G2DAF Mark II receiver which is a 160-10m, double conversion,
> 16 tube (valve) receiver.
>
> Sensitivity: 10dB S/N for .5uV
> Selectivity: 2.5Khz BW at -6dB,  5Khz at -60dB
> second channel rejection of 80dB or more
> IF breakthrough rejection of 80dB or more
> crystal HFO (converter) for each band
> absolutely minimal spurs
> selectable AGC
> AM noise limiter
> frontend dynamic range of 100dB or more
> Q-multiplier
> mechanical filter
>
>
> But I don't think it was as popular (due to the complexity) as the
> previous version which is what I think you have. That's another
> one "with many hundred built". Maybe someone else has more
> information or knows some hams to ask.
>
> 73 Kees K5BCQ
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>



From hbr@mailman.qth.net  Sun Aug  3 17:54:23 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 3 Aug 2003 11:54:23 -0500
Subject: Fw: Re: [HBR] Brittish/Canadian HBR
Message-ID: <20030803.115427.-250047.6.windy10605@juno.com>

Which ham bands does it cover ?

73 Kees K5BCQ


--------- Forwarded message ----------
From: "Tom Smith" <tsmith@hal-pc.org>
To: <hbr@mailman.qth.net>
Date: Sun, 3 Aug 2003 08:34:09 -0700
Subject: Re: [HBR] Brittish/Canadian HBR
Message-ID: <009801c359d4$af125960$3580b4ce@tsmith>
References: <20030803.101213.-250047.4.windy10605@juno.com>

The original G2DAF receiver had 20 tubes (excuse me  - valves). One of
the
articles suggested a commercial front end made by "Electroniques" (it
looks
like good stuff) which is how my receiver is made. This receiver has 14
tubes.


----- Original Message -----
From: <windy10605@juno.com>
To: <hbr@mailman.qth.net>
Sent: Sunday, August 03, 2003 8:12 AM
Subject: Re: [HBR] Brittish/Canadian HBR


> I have the 5th Edition (1976) of the RSGB manual which has a
> G2DAF Mark II receiver which is a 160-10m, double conversion,
> 16 tube (valve) receiver.
>
> Sensitivity: 10dB S/N for .5uV
> Selectivity: 2.5Khz BW at -6dB,  5Khz at -60dB
> second channel rejection of 80dB or more
> IF breakthrough rejection of 80dB or more
> crystal HFO (converter) for each band
> absolutely minimal spurs
> selectable AGC
> AM noise limiter
> frontend dynamic range of 100dB or more
> Q-multiplier
> mechanical filter
>
>
> But I don't think it was as popular (due to the complexity) as the
> previous version which is what I think you have. That's another
> one "with many hundred built". Maybe someone else has more
> information or knows some hams to ask.
>
> 73 Kees K5BCQ
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>


************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr

From hbr@mailman.qth.net  Sun Aug  3 21:49:05 2003
From: hbr@mailman.qth.net (Stan Wilson)
Date: Sun, 3 Aug 2003 15:49:05 -0500
Subject: [HBR] Restoring old receiver
In-Reply-To: <001f01c359d0$3bc9dae0$45245643@dell2000>
Message-ID: <000001c35a00$ae11fc60$0101320a@CPU>

You are correct Hugo.....   The mica ones in the RF tuning section look
ok, but the wax paper and electrolitics are bad news The hum level is at
max no matter where you put the RF and Audio gain controls.  I think I
need to replace about 22 caps total. De stan  

-----Original Message-----
From: hbr-admin@mailman.qth.net [mailto:hbr-admin@mailman.qth.net] On
Behalf Of Hugo W. Catta
Sent: Sunday, August 03, 2003 9:02 AM
To: hbr@mailman.qth.net
Subject: Re: [HBR] Restoring old receiver


----- Original Message ----- 
From: <N2EY@aol.com>
To: <hbr@mailman.qth.net>
Sent: Sunday, August 03, 2003 10:21 AM
Subject: Re: [HBR] Restoring old receiver


> In a message dated 8/2/03 4:08:56 PM Eastern Daylight Time,
ak0b@swbell.net
> writes:
>
> > I recent acquired an old receiver from the late 1940s that is not
> > collectable grade.
>
> What model?
>
> Every cap in it needs replaced plus several  tubes.
> >

Every cap?
Do the mica and ceramic caps age as badly as electrolitics and wax /
papers
?
I ask this because you don't see too many old oscillators suffering from
bad
caps as audio stages do, for instance.

Curiously,
Hugo
AA1XV


************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr


From hbr@mailman.qth.net  Mon Aug  4 01:33:13 2003
From: hbr@mailman.qth.net (Dan Merz)
Date: Sun, 03 Aug 2003 17:33:13 -0700
Subject: [HBR] Restoring old receiver
References: <000001c35a00$ae11fc60$0101320a@CPU>
Message-ID: <3F2DA9C9.56D57C8@3-cities.com>

Stan,  try replacing the electrolytics,   and only the papers that couple plate
circuits to a grid ,  usually in the audio section,  and usually there are only one
or two such paper caps.  I say this because those are the only caps where small
amounts of leakage cause a problem.    Dan.

Stan Wilson wrote:

> You are correct Hugo.....   The mica ones in the RF tuning section look
> ok, but the wax paper and electrolitics are bad news The hum level is at
> max no matter where you put the RF and Audio gain controls.  I think I
> need to replace about 22 caps total. De stan
>
> -----Original Message-----
> From: hbr-admin@mailman.qth.net [mailto:hbr-admin@mailman.qth.net] On
> Behalf Of Hugo W. Catta
> Sent: Sunday, August 03, 2003 9:02 AM
> To: hbr@mailman.qth.net
> Subject: Re: [HBR] Restoring old receiver
>
> ----- Original Message -----
> From: <N2EY@aol.com>
> To: <hbr@mailman.qth.net>
> Sent: Sunday, August 03, 2003 10:21 AM
> Subject: Re: [HBR] Restoring old receiver
>
> > In a message dated 8/2/03 4:08:56 PM Eastern Daylight Time,
> ak0b@swbell.net
> > writes:
> >
> > > I recent acquired an old receiver from the late 1940s that is not
> > > collectable grade.
> >
> > What model?
> >
> > Every cap in it needs replaced plus several  tubes.
> > >
>
> Every cap?
> Do the mica and ceramic caps age as badly as electrolitics and wax /
> papers
> ?
> I ask this because you don't see too many old oscillators suffering from
> bad
> caps as audio stages do, for instance.
>
> Curiously,
> Hugo
> AA1XV
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
> http://mailman.qth.net/mailman/listinfo/hbr
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr



From hbr@mailman.qth.net  Mon Aug  4 02:33:27 2003
From: hbr@mailman.qth.net (Stan Wilson)
Date: Sun, 3 Aug 2003 20:33:27 -0500
Subject: [HBR] Restoring old receiver
In-Reply-To: <3F2DA9C9.56D57C8@3-cities.com>
Message-ID: <000201c35a28$67acdec0$0101320a@CPU>

Thanks for the hint Dan.   I think I will try to bring the rcvr back to
normal with the caps and tubes and then decide if I want to use it as a
platform or let someone else add it to their collection.  Hi  stan 

-----Original Message-----
From: hbr-admin@mailman.qth.net [mailto:hbr-admin@mailman.qth.net] On
Behalf Of Dan Merz
Sent: Sunday, August 03, 2003 6:33 PM
To: hbr@mailman.qth.net
Subject: Re: [HBR] Restoring old receiver

Stan,  try replacing the electrolytics,   and only the papers that
couple plate
circuits to a grid ,  usually in the audio section,  and usually there
are only one
or two such paper caps.  I say this because those are the only caps
where small
amounts of leakage cause a problem.    Dan.

Stan Wilson wrote:

> You are correct Hugo.....   The mica ones in the RF tuning section
look
> ok, but the wax paper and electrolitics are bad news The hum level is
at
> max no matter where you put the RF and Audio gain controls.  I think I
> need to replace about 22 caps total. De stan
>
> -----Original Message-----
> From: hbr-admin@mailman.qth.net [mailto:hbr-admin@mailman.qth.net] On
> Behalf Of Hugo W. Catta
> Sent: Sunday, August 03, 2003 9:02 AM
> To: hbr@mailman.qth.net
> Subject: Re: [HBR] Restoring old receiver
>
> ----- Original Message -----
> From: <N2EY@aol.com>
> To: <hbr@mailman.qth.net>
> Sent: Sunday, August 03, 2003 10:21 AM
> Subject: Re: [HBR] Restoring old receiver
>
> > In a message dated 8/2/03 4:08:56 PM Eastern Daylight Time,
> ak0b@swbell.net
> > writes:
> >
> > > I recent acquired an old receiver from the late 1940s that is not
> > > collectable grade.
> >
> > What model?
> >
> > Every cap in it needs replaced plus several  tubes.
> > >
>
> Every cap?
> Do the mica and ceramic caps age as badly as electrolitics and wax /
> papers
> ?
> I ask this because you don't see too many old oscillators suffering
from
> bad
> caps as audio stages do, for instance.
>
> Curiously,
> Hugo
> AA1XV
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers
and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
> http://mailman.qth.net/mailman/listinfo/hbr
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers
and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr


************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr


From hbr@mailman.qth.net  Tue Aug  5 13:46:07 2003
From: hbr@mailman.qth.net (Hugo W. Catta)
Date: Tue, 05 Aug 2003 08:46:07 -0400
Subject: [HBR] test. do not read
Message-ID: <001801c35b4f$8a547280$45245643@dell2000>

Test.


From hbr@mailman.qth.net  Thu Aug  7 00:21:13 2003
From: hbr@mailman.qth.net (Fowler, Ralph)
Date: Wed, 6 Aug 2003 18:21:13 -0500
Subject: [HBR] G2DAF Receiver
Message-ID: <42C2A994EBD92E4782C85E27A3E722C418AA88@sscpan2.ssc.nasa.gov>

Tom, contact me offline if you still have this receiver for sale.
rrfowler@bellsouth.net.

Thanks,
Ralph

From hbr@mailman.qth.net  Wed Aug 13 15:01:49 2003
From: hbr@mailman.qth.net (Garey Barrell)
Date: Wed, 13 Aug 2003 10:01:49 -0400
Subject: [HBR] Fw: Millen 10037 Panel Dial
Message-ID: <005701c361a3$70b54fc0$6401a8c0@hp>

----- Original Message ----- 
From: <WA5CAB@cs.com>
To: "Old Tube Radios" <boatanchors@theporch.com>
Sent: Wednesday, August 13, 2003 9:58 AM
Subject: FS: Millen 10037 Panel Dial


> Groups,
>
> For Sale: James Millen 10037 No-String Illuminated Panel Dial, condition
> NOSB, $35.00 OBO plus shipping.
>
> I acquired this for some project in the 60's or 70's and never used it.
> Uncovered it this morning.  Includes the installation
instructions/template and
> the somewhat dusty original box.
>
> Robert Downs - Houston
> <http://www.wa5cab.com>
> <wa5cab@cs.com>
>


From hbr@mailman.qth.net  Wed Aug 13 15:08:42 2003
From: hbr@mailman.qth.net (Mobile Engineering)
Date: Wed, 13 Aug 2003 09:08:42 -0500
Subject: [HBR] Fw: Millen 10037 Panel Dial
In-Reply-To: <005701c361a3$70b54fc0$6401a8c0@hp>
Message-ID: <5.2.1.1.2.20030813090713.00b56008@pop.mnic.net>

Hi,

I'd be happy to take the dial off your hands for $35 - unless another has 
an urgent need for it or there's an overwhelming rush.

Let know to what address I should address my check. Plus shipping/handling? 
How much total?

73's,

John, K0YQX

At 10:01 AM 8/13/2003 -0400, you wrote:

>----- Original Message -----
>From: <WA5CAB@cs.com>
>To: "Old Tube Radios" <boatanchors@theporch.com>
>Sent: Wednesday, August 13, 2003 9:58 AM
>Subject: FS: Millen 10037 Panel Dial
>
>
> > Groups,
> >
> > For Sale: James Millen 10037 No-String Illuminated Panel Dial, condition
> > NOSB, $35.00 OBO plus shipping.
> >
> > I acquired this for some project in the 60's or 70's and never used it.
> > Uncovered it this morning.  Includes the installation
>instructions/template and
> > the somewhat dusty original box.
> >
> > Robert Downs - Houston
> > <http://www.wa5cab.com>
> > <wa5cab@cs.com>
> >
>
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and
>construction notes...... via http://www.qsl.net/k5bcq/
>
>Retrieve reflector archived data via 
>http://mailman.qth.net/mailman/listinfo/hbr



From hbr@mailman.qth.net  Thu Aug 14 01:17:32 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Wed, 13 Aug 2003 20:17:32 -0400
Subject: [HBR] Mystery HB Receiver?  Transceiver?
Message-ID: <3F3A9CDC.8755.2C9758C@localhost>

Wierd ... maybe 2 meters?   6?  CB?  Looks like it could be a 
transceiver.    Likely to be real cheap, though, and has at least some 
useful tubes and a dial, if the set itself turns out to be uninteresting.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3040064000&
category=4673

Walt Hutchens
KJ4KV

From hbr@mailman.qth.net  Thu Aug 14 01:18:44 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Wed, 13 Aug 2003 19:18:44 -0500
Subject: [HBR] Mystery HB Receiver?  Transceiver?
Message-ID: <20030813.191849.-140685.12.windy10605@juno.com>

Well, it isn't the 80/40/20 homebrew SSB Transceiver I have up there. But
you are right, it may be a cheap
way to pick up some parts.

73 Kees K5BCQ 

From hbr@mailman.qth.net  Thu Aug 14 01:28:28 2003
From: hbr@mailman.qth.net (Bob Cole)
Date: Wed, 13 Aug 2003 20:28:28 -0400
Subject: [HBR] Mystery HB Receiver?  Transceiver?
In-Reply-To: <3F3A9CDC.8755.2C9758C@localhost>
Message-ID: <ACEMKEPOGPJPGIMEGGJOIEMICBAA.W4RLC@cox.net>

If I remember correctly its from the ARRL mobil handbook. Give me a few days
and I'll try to look up the information.

Bob

-----Original Message-----
From: hbr-admin@mailman.qth.net [mailto:hbr-admin@mailman.qth.net]On
Behalf Of waltah@earthlink.net
Sent: Wednesday, August 13, 2003 20:18
To: hbr@mailman.qth.net
Subject: [HBR] Mystery HB Receiver? Transceiver?


Wierd ... maybe 2 meters?   6?  CB?  Looks like it could be a
transceiver.    Likely to be real cheap, though, and has at least some
useful tubes and a dial, if the set itself turns out to be uninteresting.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3040064000&
category=4673

Walt Hutchens
KJ4KV
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and
construction notes...... via http://www.qsl.net/k5bcq/

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr




From hbr@mailman.qth.net  Tue Aug 19 16:39:52 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Tue, 19 Aug 2003 10:39:52 -0500
Subject: [HBR] Fw: Question about homebrew receiver
Message-ID: <20030819.104234.-437699.3.windy10605@juno.com>

Here is a note I just received and I thought I'd pass it by the experts.
Please respond to Don directly since he's not on the reflector and copy
the reflector.

73 Kees K5BCQ

----- Forwarded Message -----
From: "Kelly, Don" <dkelly@citgo.com>
To: "'k5bcq@arrl.net'" <k5bcq@arrl.net>
Date: Tue, 19 Aug 2003 10:14:22 -0500
Subject: Question about homebrew receiver
Message-ID: <5E2014C0D8902245BC25507A40C55EA80D1077@trex.tulsa.citgo.com>

I saw your HBR receiver site. Your presentation of those rigs is great. I
could not find a better tube RX site anywhere on the web.


I have almost completed a homebrew tube receiver and I have one small
problem I would like to ask you about if you are still in that "busines".
My rig is basic 40 meter. Will use front end upper band to 40 converters
for 20, 15, 10. Same in the "twin" transmitter only backwards (will use
RX LO and mix up).
I use a 6BA6 RF amp with gang cap to tune front end. This is going to be
my question. 
My LO runs 3.0MHz to 3.35MHz with 4MHz IF using micro processor crystal
in lattice filter. 
The LO is buffered by a 6C4 cathode follower with double tuned bandpass
filter to reduce harmonics. Going to change to triple tuned as there is
still a slight birdie that I hear on quiet band.
The mixer is 6BE6 pentagrid mixer. I probably didn't need to buffer the
LO due to good isolation characteristic of 6BE6 but since I am going to
use RX LO for transmit I thought this to be wise.
There are three stages of IF all of which will be controlled by AGC (not
sure whether to use IF or audio yet)...no AGC on RF amp planned yet but I
think I will make change.
I use 12AT7 product detector. MY BFO is single 2N2222A solid state
Hartley with low pass filter in output. Birdies originally appeared at
harmonics of LO and BFO and these filters all but wiped them out.
AF pre-amp is 6CG7 with 6005 power amp. 
I used a lot different things. I used toroids in place of pi wound chokes
with great results as it made thing smaller. The RF chokde after the
product detector is an FT82-75 works somehat as a low pass audio filter. 
The LO coil is also toroid T68-6 which has performed tempature wise much
better than the literature would lead one to believe. I purchase a new
100pF cap form Cardwell Condesor supported on both ends and
mounted all the components in a PC board box. I positioned all the LO
components on standoffs as solid as I could. I temperature adjusted for
several weeks until I was satisfied. After initial warmup it is SSB
stable for hours at a time even though the chassis heats up...the
isolation in the PC bd box and because I kept heat away from this area
makes it very stable.
I hope this is not too much info but a little background. 
My only real problem is that when I tune the front end I get an
occasional "squiggling" type of noise. Usually when I tune off the
resonant freq and it is not bothering operation. I realize this is
probably some HF or VHF parasitic. I placed resistors in parallel with
the front end coils and it reduced it. I think this problem occurred in
part because I used toroids in the front end and I am a victim of Q. I
see in many of the schematics on your site the placement of a small
resistance in series with first tuned coil and grid of RF amp. Sometimes
a choke is wound on this small resistance I assume to suppress
parasitics.
I can find no info on this fix or if there is a better more current
method for reducing this problem....such as ferrite beads, best trimmer
caps to use, etc.
If you are not busy or if you are still interested in tube receivers
could you help me or refer me to someone with some info? All my dad's old
tube books have no reference and the ARRL Handbooks show the use of this
fix but give no background.
If you are busy with other things thanks anyways and I appreciate your
site for us tube builders. 
Don Kelly, KA5UOS 
Edmond, OK      73003 






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From hbr@mailman.qth.net  Tue Aug 19 18:27:47 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Tue, 19 Aug 2003 13:27:47 -0400
Subject: [HBR] Question about homebrew receiver
Message-ID: <3F4225D3.20135.808EEA@localhost>

Don Kelly describes a very sophisticated receiver design, then says:

> My only real problem is that when I tune the front end I get an
> occasional "squiggling" type of noise. Usually when I tune off the
> resonant freq and it is not bothering operation. I realize this is
> probably some HF or VHF parasitic. I placed resistors in parallel
> with the front end coils and it reduced it. I think this problem
> occurred in part because I used toroids in the front end and 
> I am a victim of Q.

Kees asked for 'experts'; if having felt your pain (Don) is a 
qualification, I guess I'm one ... there was some of this stuff in the 
HBR2K design and in most rigs before that, too.

This is a VHF parasitic.

First, the reason you don't see much about this kind of problem in 
the old tube gear handbooks (like the Radio Amateur's in the 60's) is 
that when hams were doing a lot of building tube gear, the tubes they 
used mostly weren't high enough gain at VHF to have the problem if 
the design was at all reasonable.   Look at the 'command' recievers -- 
grid leads all a couple inches long, some longer than that, but who 
ever saw a VHF parasitic in one of them?   

With higher VHF-gain tubes (and transistors), however, you have to 
be a lot more careful.  And you have to know what to be careful of.   

*The problem isn't the toroids.*   Take the shunt resistors off.   
They're hurting the Q at the intended working frequency and 
(evidently) not hurting it enough at VHF.   You are indeed a victim of 
Q, but not the Q of the toroids.

The 'squiggle' you hear -- I assume you mean a sort of warbling, 
unstable beat note -- is the beat between a high harmonic of some 
oscillator in the set (like the first LO) and the unwanted VHF 
oscillation in some stage.   First thing to do is pin down which stage 
is oscillating.   Usually you can do that by touching various points 
with the tip of a screwdriver 6" long or so; all the points which make 
the warble disappear (even when you retune the front end) are part of 
the oscillating stage and circuit.   Since you notice the problem when 
you tune the front end, the chances are that it's the 6BA6 that's 
oscillating but it could be the 6BE6.    Poke around (with due care for 
high voltage) -- you'll figure it out pretty quickly.

Now you need to figure out what is the oscillator circuit.   Usually the 
wiring in the grid circuit is operating as parallel lines and the plate 
circuit looks the same and is tuned close enough to the same 
frequency to produce a TPTG oscillator at something like 100 Mcs.  

Usually the only parts that are really in the VHF circuit are the wiring 
and shunt capacitances.   The toroids probably are part of the shunt 
capacity and otherwise just chokes.   The 'cure' will be to put a small 
resistor *in series* with one or both VHF tuned circuits at a high 
current point, i.e., close to the end of the wire that has the most 
capacitance.   

What I'd try first is 100 ohms, 1/4 watt, carbon film (anything but 
wirewound will work) at the point where the grid of each stage 
connects to the tuning cap or shunt padder cap, whichever comes 
first.   Do the 6BA6 grid first as that's probably where the trouble is.

If you can shorten the grid and/or plate leads of this stage, do it.   
That moves the resonant frequency higher, where the stage gain is 
less and you might fix the problem that way.   However, there is no 
significant loss from the 100 ohm resistor as there is no grid current 
flowing in it at the HF signal frequency -- Class 'A' amp, right?   Even 
if you put one in the plate circuit it doesn't hurt 'cause these tubes 
have plate resistances like 200k -- current is very low there, too.

BTW it's not true that these parasitics only hurt performance if you 
can hear them.   They usually occur over a substantial range of the 
tuning and they increase stage noise levels and decrease gain.   You 
can't have a top performing receiver without killing this thing.

I'm impressed that you got good performance with a toroid for the LO 
coil ... I go air core only for that job.   You do need AGC on the RF 
stage; the big problem on the lower bands isn't getting max 
sensitivity, it is coping with all the garbage coming in from your 
antenna, and the 6BE6 is far from a great strong-signal mixer -- it 
needs all the help it can get.   Sounds like a great piece of work -- 
you really ought to join this list.   Quiet right now, but we go through 
periods of serious activity and you'd fit right in!

Walt Hutchens
KJ4KV

From hbr@mailman.qth.net  Tue Aug 19 19:48:36 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Tue, 19 Aug 2003 14:48:36 -0400 (EDT)
Subject: [HBR] WTS: 455kc IF -> audio, old homebrew with S meter FM AM SSB
In-Reply-To: <3F4225D3.20135.808EEA@localhost>
Message-ID: <Pine.LNX.4.33.0308191444480.9874-100000@localhost.localdomain>

455kc IF -> audio, old homebrew with S meter FM AM SSB
$45 plus ship from 30114
http://edebris.com/catalog2/item/985


From hbr@mailman.qth.net  Sun Aug 24 22:35:42 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 24 Aug 2003 16:35:42 -0500
Subject: [HBR] another homebrew receiver
Message-ID: <20030824.163545.-117027.23.windy10605@juno.com>

Cliff White wants to swap another homebrew receiver. Turns out, it is not
an HBR. It's from an article in the March 1956 QST (mine don't go back
that far). It is a double conversion 1600Khz IF and 85Khz IF, band
switching 80/40/20/15/10 receiver with an Eddystone 898 dial. Pictures
are available if you are interested. 
 
It has a cabinet with three large holes in the lid for ventilation and
the usual dust and dirt from storage.
The upper toggle switches and the knobs on the upper right and left are
bent and have slight front panel  
       indentations (dropped at an angle ?).
The 898 dial turns smoothly and only looks age worn and the paper has
spots. 
Everything is there, tubes, etc. 
Self contained power supply inside, requires external speaker.
Construction looks OK, not great, not bad. 
Looks like he used the internals and housing from a TV tuner for the band
switch which is from another QST
        article in that time frame, according to Cliff. 
Cliff has a letter from the original owner with his schematic
modifications and the first two pages of the
        original article.
I have not powered the unit on.   
 
Cliff wants to swap for an excellent condition, unused, Eddystone 898
dial. Shipping is whatever FedEx charges plus $10 for packing, packaging
materials, etc. 

73 Kees K5BCQ

From hbr@mailman.qth.net  Mon Aug 25 01:14:12 2003
From: hbr@mailman.qth.net (john)
Date: Sun, 24 Aug 2003 20:14:12 -0400
Subject: [HBR] another homebrew receiver
In-Reply-To: <20030824.163545.-117027.23.windy10605@juno.com>
Message-ID: <3.0.3.32.20030824201412.029e84a8@pop-server.nc.rr.com>

I've got a NOS dial...can you provide pix?

Thanks
John



At 04:35 PM 8/24/03 -0500, you wrote:
>
>Cliff White wants to swap another homebrew receiver. Turns out, it is not
>an HBR. It's from an article in the March 1956 QST (mine don't go back
>that far). It is a double conversion 1600Khz IF and 85Khz IF, band
>switching 80/40/20/15/10 receiver with an Eddystone 898 dial. Pictures
>are available if you are interested. 
> 
>It has a cabinet with three large holes in the lid for ventilation and
>the usual dust and dirt from storage.
>The upper toggle switches and the knobs on the upper right and left are
>bent and have slight front panel  
>       indentations (dropped at an angle ?).
>The 898 dial turns smoothly and only looks age worn and the paper has
>spots. 
>Everything is there, tubes, etc. 
>Self contained power supply inside, requires external speaker.
>Construction looks OK, not great, not bad. 
>Looks like he used the internals and housing from a TV tuner for the band
>switch which is from another QST
>        article in that time frame, according to Cliff. 
>Cliff has a letter from the original owner with his schematic
>modifications and the first two pages of the
>        original article.
>I have not powered the unit on.   
> 
>Cliff wants to swap for an excellent condition, unused, Eddystone 898
>dial. Shipping is whatever FedEx charges plus $10 for packing, packaging
>materials, etc. 
>
>73 Kees K5BCQ
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>construction notes...... via http://www.qsl.net/k5bcq/ 
>
>Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>
>
>---
>
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/03
>

From hbr@mailman.qth.net  Mon Aug 25 01:21:34 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 24 Aug 2003 19:21:34 -0500
Subject: Fw: Re: [HBR] another homebrew receiver
Message-ID: <20030824.192136.-117027.26.windy10605@juno.com>

Sure, John. Pictures are on the way directly to you. Just for
information, Eddystone 898 dials are going for $100 and up on e-Bay. I
saw one really nice NOS one go for $150, maybe others have seen similiar
prices.
Just to put everything in perspective as to what you have. This radio
does have an Eddystone 898 and it's nice, but not in new condition.

73 Kees K5BCQ

--------- Forwarded message ----------
From: john <johnmb@nc.rr.com>
To: hbr@mailman.qth.net
Date: Sun, 24 Aug 2003 20:14:12 -0400
Subject: Re: [HBR] another homebrew receiver
Message-ID: <3.0.3.32.20030824201412.029e84a8@pop-server.nc.rr.com>

I've got a NOS dial...can you provide pix?

Thanks
John



At 04:35 PM 8/24/03 -0500, you wrote:
>
>Cliff White wants to swap another homebrew receiver. Turns out, it is
not
>an HBR. It's from an article in the March 1956 QST (mine don't go back
>that far). It is a double conversion 1600Khz IF and 85Khz IF, band
>switching 80/40/20/15/10 receiver with an Eddystone 898 dial. Pictures
>are available if you are interested. 
> 
>It has a cabinet with three large holes in the lid for ventilation and
>the usual dust and dirt from storage.
>The upper toggle switches and the knobs on the upper right and left are
>bent and have slight front panel  
>       indentations (dropped at an angle ?).
>The 898 dial turns smoothly and only looks age worn and the paper has
>spots. 
>Everything is there, tubes, etc. 
>Self contained power supply inside, requires external speaker.
>Construction looks OK, not great, not bad. 
>Looks like he used the internals and housing from a TV tuner for the
band
>switch which is from another QST
>        article in that time frame, according to Cliff. 
>Cliff has a letter from the original owner with his schematic
>modifications and the first two pages of the
>        original article.
>I have not powered the unit on.   
> 
>Cliff wants to swap for an excellent condition, unused, Eddystone 898
>dial. Shipping is whatever FedEx charges plus $10 for packing, packaging
>materials, etc. 
>
>73 Kees K5BCQ
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>construction notes...... via http://www.qsl.net/k5bcq/ 
>
>Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>
>
>---
>
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/03
>
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr

From hbr@mailman.qth.net  Mon Aug 25 12:42:20 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 25 Aug 2003 07:42:20 -0400
Subject: Fw: Re: [HBR] another homebrew receiver
In-Reply-To: <20030824.192136.-117027.26.windy10605@juno.com>
Message-ID: <3F49BDDC.22572.1F0B7A@localhost>

Kees said:
> Eddystone 898 dials are going for $100 and up on e-Bay.

How 'bout that (apparently) nice HBR-16 that sold yesterday for 
$370.   Unless I get real lucky at some fleamarket, the only way I'm 
gonna see an HBR is to build it!

Walt Hutchens
KJ4KV


From hbr@mailman.qth.net  Mon Aug 25 12:42:20 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 25 Aug 2003 07:42:20 -0400
Subject: [HBR] Another HBR Project
Message-ID: <3F49BDDC.25402.1F0B14@localhost>

Wandering around the HBR site in the last week I got the urge to try 
something more like the traditional design.   Yeah, I know I should 
finish up the HBR2K project, but the summer has been a mess and I 
really need a break.   The set works well -- it's on daily duty in the 
kitchen -- but needs further testing and probably further tweaking of 
the 1st mixer and RF amp.

So for a break, well, looking at the various diagrams I thought "what 
about a quicky"?   Rather than ask the logical question ("Are you 
crazy?")  I cut to the chase:  1.  Do I have all the parts?   The answer 
-- with some compromises -- turned out to be 'yes.'   And,  2. Could I 
do this in a week flat?   The answer to that required less thought than 
you might expect: My wonderful wife Sharyn said "No"!   I'd need to 
be able to do 12-16 hour days for a week and (basically) that's not 
gonna happen with the life we have.

But ... maybe two weeks?   Anyhow, I'm going to try ... might make 
it if nothing much else craps out household-wise and the grass starts 
to slow down for the summer.   What I've worked out is a 10-tube 
design on a 10" x 12" x 3" chassis, using a command set tuning cap 
and dial drive.   And -- for the heck of it -- the command set plug in 
coil set in place of independent coils.      I think I've figured out how 
to plug the coils in through the front panel.  (Sort of a very poor man's 
HRO.)  Replacing the antenna and RF coils with toroids ought to give 
good enough Q's and locating the coils under the chassis should be 
good for stability.  Command set IFTs as well -- 1415 kcs retuned to 
1610 and 85 kcs. For the time being I'll use just one IF stage but 
there'll be room for another if needed.   I once converted a command 
set to double conversion by replacing the 1st IF stage with a mixer; 
as I recall that had enough gain, so why not?

Lots of issues, but what's a project for, if not a learning experience?   

So far I have a chassis sketch that looks okay -- gee, I never had so 
much space for just 10 tubes.   Tomorrow, knock the holes in the 
chassis.   We'll see how it goes.   

Walt Hutchens
KJ4KV

From hbr@mailman.qth.net  Mon Aug 25 13:44:36 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 25 Aug 2003 07:44:36 -0500
Subject: Fw: Re: Fw: Re: [HBR] another homebrew receiver
Message-ID: <20030825.074441.-241655.0.windy10605@juno.com>

Thanks for the information, Walt. I just captured the photos off e-Bay
for the web site. Another classic 
HBR-16. I believe it says "PLM or FLM ....  1961" on the front. I sent
the seller a note to ask him/her. See the unique ventilation scheme on
the back using tube sockets ? Good ol' homebrew, no two alike.

73 Kees K5BCQ

--------- Forwarded message ----------
From: waltah@earthlink.net
To: hbr@mailman.qth.net
Date: Mon, 25 Aug 2003 07:42:20 -0400
Subject: Re: Fw: Re: [HBR] another homebrew receiver
Message-ID: <3F49BDDC.22572.1F0B7A@localhost>

Kees said:
> Eddystone 898 dials are going for $100 and up on e-Bay.

How 'bout that (apparently) nice HBR-16 that sold yesterday for 
$370.   Unless I get real lucky at some fleamarket, the only way I'm 
gonna see an HBR is to build it!

Walt Hutchens
KJ4KV

************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr

From hbr@mailman.qth.net  Mon Aug 25 13:54:22 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 25 Aug 2003 07:54:22 -0500
Subject: [HBR] Another HBR Project
Message-ID: <20030825.075429.-241655.1.windy10605@juno.com>

Interesting ideas Walt, I'll be looking forward to the results. This
business about using a turret tuner out of an old TV, like on this 1956
radio of Cliff's, looks interesting also. Toroids should make that very
useable.

73 Kees K5BCQ

From hbr@mailman.qth.net  Mon Aug 25 14:58:21 2003
From: hbr@mailman.qth.net (Garey Barrell)
Date: Mon, 25 Aug 2003 09:58:21 -0400
Subject: Fw: Re: [HBR] another homebrew receiver
References: <20030825.074441.-241655.0.windy10605@juno.com>
Message-ID: <005401c36b10$f234c820$6401a8c0@hp>

Kees -

Actually those are "ventilation" hole plugs rather than tube sockets.  They
are the same as the (usually) bright nickel plated hole plugs that snap into
an unwanted hole in a chassis.  Easier to punch a single large hole than
drill a bunch of small holes.   I have also seen them with a screen mesh
center, all nickel plated.

73, Garey - K4OAH
Atlanta

----- Original Message ----- 
From: <windy10605@juno.com>

> Thanks for the information, Walt. I just captured the photos off e-Bay
> for the web site. Another classic
> HBR-16. I believe it says "PLM or FLM ....  1961" on the front. I sent
> the seller a note to ask him/her. See the unique ventilation scheme on
> the back using tube sockets ? Good ol' homebrew, no two alike.
>
> 73 Kees K5BCQ
>


From hbr@mailman.qth.net  Mon Aug 25 15:47:15 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 25 Aug 2003 09:47:15 -0500
Subject: Fw: Re: Re: Fw: Re: [HBR] another homebrew receiver
Message-ID: <20030825.094719.-442571.0.windy10605@juno.com>

OK, thanks Garey. I had never seen those with the seven smaller holes in
them. Just the plugs and the ones with screen mesh. Looked like a
bakelite tube socket with the pins pulled.

73 Kees K5BCQ


--------- Forwarded message ----------
From: "Garey Barrell" <k4oah@mindspring.com>
To: <hbr@mailman.qth.net>
Date: Mon, 25 Aug 2003 09:58:21 -0400
Subject: Re: Re: Fw: Re: [HBR] another homebrew receiver
Message-ID: <005401c36b10$f234c820$6401a8c0@hp>
References: <20030825.074441.-241655.0.windy10605@juno.com>

Kees -

Actually those are "ventilation" hole plugs rather than tube sockets. 
They
are the same as the (usually) bright nickel plated hole plugs that snap
into
an unwanted hole in a chassis.  Easier to punch a single large hole than
drill a bunch of small holes.   I have also seen them with a screen mesh
center, all nickel plated.

73, Garey - K4OAH
Atlanta

----- Original Message ----- 
From: <windy10605@juno.com>

> Thanks for the information, Walt. I just captured the photos off e-Bay
> for the web site. Another classic
> HBR-16. I believe it says "PLM or FLM ....  1961" on the front. I sent
> the seller a note to ask him/her. See the unique ventilation scheme on
> the back using tube sockets ? Good ol' homebrew, no two alike.
>
> 73 Kees K5BCQ
>

************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr

From hbr@mailman.qth.net  Tue Aug 26 01:27:57 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 25 Aug 2003 20:27:57 -0400
Subject: [HBR] Another HBR Project
In-Reply-To: <20030825.075429.-241655.1.windy10605@juno.com>
Message-ID: <3F4A714D.8500.2DC16DA@localhost>

Kees said:

> This business about using a turret tuner out of an old TV, like on
> this 1956 radio of Cliff's, looks interesting also. Toroids should
> make that very useable. 

Yeah, wonderful idea.   The problem with those TV tuner bandswitch 
designs in the past was that the coils were so small that you couldn't 
get a decent Q but with toroids, that wouldn't be a problem.   You 
might even put the toroid in series with the original coil and use that 
as a trimmer.   Somebody on the list ought to try it!

On the 'One Week HBR' project, I'm chewing now on the HV supply.  
I like to keep it to around 150 volts to reduce the power consumption 
(=heat) but nobody much made power transformers like that.  I have 
found a few 'isolation' transformers in the 20-30 watt range but even 
those are not common now.   I've done 'transformerless' designs but 
having to decouple the negative line is a source of design problems.   
Another trick I've used is to convert the primaries of two Radio Shack 
filament transformers of the right size into a single 1:1 transformer -- 
they are bobbin wound with equal bobbins for both windings so this is 
easy to do once you get the transformer apart.  

I have just tested a 15 watt 1:1 power supply:  with a capacitive input 
filter it gives 110 volts at 90 ma which should be enough power for the 
1WHBR.   The voltage, however, may be an issue.   I want to use a 
12BH7 (dual medium mu triode) for p-p audio output, driving it with a 
phase splitter; there may be trouble getting enough drive voltage.  

We'll see.  Have to get going on the chassis.

Walt Hutchens
KJ4KV




From hbr@mailman.qth.net  Tue Aug 26 01:53:07 2003
From: hbr@mailman.qth.net (john)
Date: Mon, 25 Aug 2003 20:53:07 -0400
Subject: [HBR] Another HBR Project
In-Reply-To: <3F4A714D.8500.2DC16DA@localhost>
References: <20030825.075429.-241655.1.windy10605@juno.com>
Message-ID: <3.0.3.32.20030825205307.01e3b928@pop-server.nc.rr.com>

This was also implemented in the  design of the later model Meissner Signal
Shifters...

73
John K5MO



At 08:27 PM 8/25/03 -0400, you wrote:
>Kees said:
>
>> This business about using a turret tuner out of an old TV, like on
>> this 1956 radio of Cliff's, looks interesting also. Toroids should
>> make that very useable. 
>
>Yeah, wonderful idea.   The problem with those TV tuner bandswitch 
>designs in the past was that the coils were so small that you couldn't 
>get a decent Q but with toroids, that wouldn't be a problem.   You 
>might even put the toroid in series with the original coil and use that 
>as a trimmer.   Somebody on the list ought to try it!
>
>On the 'One Week HBR' project, I'm chewing now on the HV supply.  
>I like to keep it to around 150 volts to reduce the power consumption 
>(=heat) but nobody much made power transformers like that.  I have 
>found a few 'isolation' transformers in the 20-30 watt range but even 
>those are not common now.   I've done 'transformerless' designs but 
>having to decouple the negative line is a source of design problems.   
>Another trick I've used is to convert the primaries of two Radio Shack 
>filament transformers of the right size into a single 1:1 transformer -- 
>they are bobbin wound with equal bobbins for both windings so this is 
>easy to do once you get the transformer apart.  
>
>I have just tested a 15 watt 1:1 power supply:  with a capacitive input 
>filter it gives 110 volts at 90 ma which should be enough power for the 
>1WHBR.   The voltage, however, may be an issue.   I want to use a 
>12BH7 (dual medium mu triode) for p-p audio output, driving it with a 
>phase splitter; there may be trouble getting enough drive voltage.  
>
>We'll see.  Have to get going on the chassis.
>
>Walt Hutchens
>KJ4KV
>
>
>
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>construction notes...... via http://www.qsl.net/k5bcq/ 
>
>Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>

From hbr@mailman.qth.net  Tue Aug 26 15:33:43 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Tue, 26 Aug 2003 10:33:43 -0400
Subject: Fwd: Re: [HBR] Another HBR Project
In-Reply-To: <5.2.1.1.2.20030826070406.00b1a170@pop.mnic.net>
Message-ID: <3F4B3787.10531.64BAB2@localhost>

John (Mobile Engineering) made a very generous offer to try to locate 
a transformer but:  

> I'm not sure of the specs though.  Does this proposed transformer need to
> provide 150V @ 200mA (30W)?  If not, how much power does it need to
> provide? If regulation isn't critical we have a chance ...

I *think* I've got an answer for this project (one or the other of the 
'merged' R.S. filament transformers) but I'd be delighted to get one or 
a few for the future -- there are easily three more such projects 
milling around in my head and I want them *outta there* in the next 
year or two!

Ideally I'd wind up with 140-160 VDC 120 ma or so post filter.   So 
about 140 RMS if not too 'stiff', less if better regulated.   20 VA is 
probably ideal as size and weight are always an issue with an 
alumium chassis.    

In homebrewing, one compromises a bit ... anything close would 
probably be scored a hit.  Thanks!

Walt Hutchens
KJ4KV

From hbr@mailman.qth.net  Thu Aug 28 17:20:04 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Thu, 28 Aug 2003 12:20:04 -0400
Subject: [HBR] Another HBR Project -- Chapter 2
In-Reply-To: <3F49BDDC.25402.1F0B14@localhost>
Message-ID: <3F4DF374.31408.C1E653@localhost>

One virtue of a simpler design ought to be shorter posts.   We'll see.

The 'something more like the traditional design' has turned out to be:

6EH7 RF
6ES8 1st mixer -- 1665 kcs
6BH6 1st oscillator (tunable)
6ES8 2nd mixer -- 85 kcs
1/2 6U8 2nd oscillator 1750 kcs
6EH7 IF -- 85 kcs
1/2 6U8 BFO -- 85 kcs
1/2 12AX7 plate detector/product detector
1/2 12AX7 AGC amp (basically another plate det.)
1/2 6U8 1st audio
1/2 6U8 phase splitter
12BH7 2nd audio 
1/2 6U8 100 kcs calibrator

The 1665 kcs 1st IF was chosen because I have a 1750 kcs crystal.  
(Because the harmonics are on the edges of several bands, that's 
not ideal and I'll switch to something lower when I find the right 
crystal.)   Two 1415 kcs command set transformers will be converted 
to serve; there'll be space between them to add another IF stage if 
needed, but I don't expect I will.   The 6EH7 has about three times 
the gain of a 6BJ6 and (in my opinion) the original HBR designs had 
more gain than needed.

Front panel controls PWR, STBY, BFO, BFO TUNE, CALIB ON, 
PHONES, CALIBRATE (trimmer), pilot lamp, RF GAIN, AUDIO 
GAIN.   

Should have the major parts mounted by tomorrow night.    Pix then.

Walt 
KJ4KV

The chassis hole-making is done but one, the front panel is laid out 
and should be done today.  

From hbr@mailman.qth.net  Sat Aug 30 19:58:44 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sat, 30 Aug 2003 14:58:44 -0400
Subject: [HBR] Another HBR Project -- Chapter 3
Message-ID: <3F50BBA4.6743.157A971@localhost>

Good progress this week.  Panel and chassis are done and power 
supply wiring is working.   The nearest thing to excitement was when 
the unused tap of one of the filament transformers shorted to the 
chassis and nearly cooked the thing.   The rest went smoothly 
including some tricky mechanical work for the command receiver 
plug-in coil unit -- glad that's behind me.

The 6EW6 looks like a better local oscillator than the 6BH6 -- higher 
transconductance (14,000 vs. 4600) means less coupling needed 
between tube and tank circuit which means the tank has relatively 
better control over the frequency.   The price is greater heater power 
... probably worth it since the layout allows keeping the heat pretty 
well away from the tank.

W6TC certainly knew his practical theory:  using a pentode ECO not 
only gives you some isolation from the mixer but there's a lot of 2nd 
harmonic output and that's used in the HBR-series (as in similar 
commercial designs of the time) to get injection for the higher bands. 
It is a potential source of 'spurs' on 80-40 where the fundamental is 
used but with high-Q front end coils that should be a tolerable 
problem.

Pictures -- captions follow each address:

http://www.collie-rescuers.com/ebay/cistern3.jpg

A first-rate workshop helps with these projects.  

http://www.collie-rescuers.com/ebay/hb1.jpg

Chassis, panel, liberated 6-9.1 Mcs command receiver tuning cap.

http://www.collie-rescuers.com/ebay/1stptst.jpg
http://www.collie-rescuers.com/ebay/1stptsb.jpg

Top and bottom views after 1st installation of parts -- +130 V, -160 V 
power supplies and filament transformers.   The negative voltage is 
needed for the AGC circuit.   Top view -- that's the output transformer 
between the two audio stages.   Other 'iron' L to R:  12VAC 1.2A 
xfmr, filter choke, 6.3-0-6.3 1.2A xfmr,  home made (primary x 
primary) 120VAC xfmr for plate supply.  Black objects in bottom view 
are filter caps.   The odd-shape socket (6U8 1st AF/phase splitter)  
is a Western Electric unit with three tie points mounted on each of 
two projections hanging off the sides -- very convenient when there 
are a bunch of parts to mount.   A flea market find ...

Audio stages next.   I have been working about 5 hours a day so this 
might indeed be a 1 week project if one could go at it dawn to 
bedtime.    

Walt 
KJ4KV

From hbr@mailman.qth.net  Sun Aug 31 14:08:36 2003
From: hbr@mailman.qth.net (Eddy Swynar)
Date: Sun, 31 Aug 2003 09:08:36 -0400
Subject: [HBR] Another HBR Project -- Chapter 3
References: <3F50BBA4.6743.157A971@localhost>
Message-ID: <009301c36fc1$15caf660$ead549c6@greg>

Hi Walt...

Very interested here in your on-going adventures with the HB rig---please
keep us advised, with my thanks in advance...

All this talk here of late has inspired ME to start laying out the parts for
my own HB superhet. Perhaps it's a LITTLE off topic on this site because
it's NOT an HBR---still, the fact that it's homebrew is enough of an
accomplishhment in and of itself these days, I think, so here goes...

It's an 11-tube 1929-style superhet, as was inspired by TJ Lindsay's piece
in the Antique Wireless Association's OLD TIMER'S BULLETIN of about a year
ago...there ARE differences, however.

First-off, there'll be a 224A RF amp. The mixer & local oscillator will be
224A's, followed by TWO stages of IF amplification c/o (you guessed it)
another pair of 224A's. The detector will be a non-regenerative 224A, and
the BFO will be a Hartley oscillator 224A. The first stage of AF
amplification will be 227---this will drive a p-p pair of 245's.

A 280 full-wave rectifier will provide some 250 VDC to the different
stages---I may have to cobble-up some multi-transformer concoction to
provide the some 17+amperes (at 2.5 volts!) filament requirements...probably
a combo of 5-volt center tapped transformers, with "stand alone" 2.5 volts
from whatever transformer(s) I might find here. Shouldn't be a problem...

I plan on making BOTH IF stages regenerative, a la a technique espoused for
ARC receivers in the first edition of UNDERSTANDING AMATEUR RADIO...and yes,
I plan to "cheat" a little by using some vintage, NOS large Meissner IF
transformers that I have here in the junque box.

RF gain will be provided by virtue of a 500-ohm "attenuator" pot in the
antenna lead, ahead of the RF amplifier (there will be NO AGC). The front
main tuning dial came from a very neat, ancient old British(?) LF
receiver---it's finished in black wrinkle paint, & the dial arcs 180
degrees. Very smooth action, & it certainly has that "1929" look.

The goal here is to have this thing finished and operational by the end of
November, in time for use in the AWA 1929 QSO Party...

I'll certainly be more than happy to keep the gang posted on developments
here, should the interest (if any!) from others merit the effort...

BTW Walt, I sure do miss your nuggets in ELECTRIC RADIO magazine---whenever
I research my older issues on topics of interest, more often than not the
pieces have been penned by you! Thanks...

~73!~ Eddy VE3CUI - VE3XZ





----- Original Message -----
From: <waltah@earthlink.net>
To: <hbr@mailman.qth.net>
Sent: Saturday, August 30, 2003 2:58 PM
Subject: [HBR] Another HBR Project -- Chapter 3


> Good progress this week.  Panel and chassis are done and power
> supply wiring is working.   The nearest thing to excitement was when
> the unused tap of one of the filament transformers shorted to the
> chassis and nearly cooked the thing.   The rest went smoothly
> including some tricky mechanical work for the command receiver
> plug-in coil unit -- glad that's behind me.
>
> The 6EW6 looks like a better local oscillator than the 6BH6 -- higher
> transconductance (14,000 vs. 4600) means less coupling needed
> between tube and tank circuit which means the tank has relatively
> better control over the frequency.   The price is greater heater power
> ... probably worth it since the layout allows keeping the heat pretty
> well away from the tank.
>
> W6TC certainly knew his practical theory:  using a pentode ECO not
> only gives you some isolation from the mixer but there's a lot of 2nd
> harmonic output and that's used in the HBR-series (as in similar
> commercial designs of the time) to get injection for the higher bands.
> It is a potential source of 'spurs' on 80-40 where the fundamental is
> used but with high-Q front end coils that should be a tolerable
> problem.
>
> Pictures -- captions follow each address:
>
> http://www.collie-rescuers.com/ebay/cistern3.jpg
>
> A first-rate workshop helps with these projects.
>
> http://www.collie-rescuers.com/ebay/hb1.jpg
>
> Chassis, panel, liberated 6-9.1 Mcs command receiver tuning cap.
>
> http://www.collie-rescuers.com/ebay/1stptst.jpg
> http://www.collie-rescuers.com/ebay/1stptsb.jpg
>
> Top and bottom views after 1st installation of parts -- +130 V, -160 V
> power supplies and filament transformers.   The negative voltage is
> needed for the AGC circuit.   Top view -- that's the output transformer
> between the two audio stages.   Other 'iron' L to R:  12VAC 1.2A
> xfmr, filter choke, 6.3-0-6.3 1.2A xfmr,  home made (primary x
> primary) 120VAC xfmr for plate supply.  Black objects in bottom view
> are filter caps.   The odd-shape socket (6U8 1st AF/phase splitter)
> is a Western Electric unit with three tie points mounted on each of
> two projections hanging off the sides -- very convenient when there
> are a bunch of parts to mount.   A flea market find ...
>
> Audio stages next.   I have been working about 5 hours a day so this
> might indeed be a 1 week project if one could go at it dawn to
> bedtime.
>
> Walt
> KJ4KV
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr


From hbr@mailman.qth.net  Sun Aug 31 16:19:25 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 31 Aug 2003 11:19:25 EDT
Subject: [HBR] Another HBR Project
Message-ID: <110.27606c2f.2c836bfd@aol.com>

In a message dated 8/25/03 8:24:40 PM Eastern Daylight Time, 
waltah@earthlink.net writes:


> I want to use a 
> 12BH7 (dual medium mu triode) for p-p audio output, driving it with a 
> phase splitter; there may be trouble getting enough drive voltage.  
> 

I've used a p-p 12BH7 as a "speaker driver" for the past several years now. 
Transformer coupled on the input. Lots of clean audio - much cleaner than 
typical audio pentodes without negative feedback.

Output iron trick: Use a small power transformer instead of a "real" audio 
trans. Core saturation not nearly as much a problem in pushpull. Filament 
windings in series will be a decent voicecoil match. Watch phasing, though!

Example: 520 VCT power transformer to 5 and 6.3 V heater windings in series. 
520/11.3 is 46-to-1 voltage ratio or 2117-to-1 impedance ratio. So a 4 ohm 
voice coil will present an impedance of about 8470 ohms to the pushpull plates. 

73 de Jim, N2EY


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multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
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From hbr@mailman.qth.net  Sun Aug 31 17:21:21 2003
From: hbr@mailman.qth.net (Stan Wilson)
Date: Sun, 31 Aug 2003 11:21:21 -0500
Subject: [HBR] Thanks for Synchronous Detector information
In-Reply-To: <NFBBIAKHGLLMJCAJKHFFCEOBDAAA.daguero@free.fr>
Message-ID: <000001c36fdb$eb150490$0101320a@CPU>


Thanks to all who respond with information on the Synchronous Detector.

Anyone interested in experimenting with one using glowbugs should start
with the CQ June 1957 article.

It uses 8 glowbugs.  However, if you want to modernize the circuit
slightly it should be possible to eliminate the reactance tube and
replace with a varicap.  Also two of the tubes are required for the
audio phase shift network and that is not required if you just desire AM
demodulation but would be necessary for SSB.

The I and Q demodulator are just detectors (mixers).   I think they
could be replaced with a Pullen mixers. 

One tube is required for the AGC stage.  

I am going to punch a chassis for all eight tubes plus power supply.
And will wire it up in stages.  I think I will also make provisions for
an audio output stage.   That way I will have a stand alone audio stage
for experimenting with various receivers.   One could also modify the
unit for other than 455 khz since only one tuned circuit is required for
the VCO.

Synchronous Detectors and Phase Lock Loops all sound scary for a glow
bug design, but once one exams the circuits they are basically just
audio amplifiers.   

Will let you know the results

Stan ak0b



From hbr@mailman.qth.net  Sun Aug 31 19:19:26 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 31 Aug 2003 13:19:26 -0500
Subject: Fw: Re: [HBR] Another HBR Project -- Chapter 3
Message-ID: <20030831.131930.-262043.0.windy10605@juno.com>

I think that's great Eddy.

As far as what's allowed on this site:

ANY discussion relative to HOMEBREW, TUBE (or hybrid) .....Receivers,
Transmitters, or Transceivers of a reasonable complexity level (superhet
receivers, etc). This may include: projects, stories, parts for sale,
parts wanted, technical discussions, new ideas, e-Bay alerts for homebrew
stuff, etc. It just started off as a site for HBR Receivers. 

73 Kees K5BCQ


--------- Forwarded message ----------
From: "Eddy Swynar" <gswynar@durham.net>
To: <hbr@mailman.qth.net>, <waltah@earthlink.net>
Date: Sun, 31 Aug 2003 09:08:36 -0400
Subject: Re: [HBR] Another HBR Project -- Chapter 3
Message-ID: <009301c36fc1$15caf660$ead549c6@greg>
References: <3F50BBA4.6743.157A971@localhost>

Hi Walt...

Very interested here in your on-going adventures with the HB rig---please
keep us advised, with my thanks in advance...

All this talk here of late has inspired ME to start laying out the parts
for
my own HB superhet. Perhaps it's a LITTLE off topic on this site because
it's NOT an HBR---still, the fact that it's homebrew is enough of an
accomplishhment in and of itself these days, I think, so here goes...

It's an 11-tube 1929-style superhet, as was inspired by TJ Lindsay's
piece
in the Antique Wireless Association's OLD TIMER'S BULLETIN of about a
year
ago...there ARE differences, however.

First-off, there'll be a 224A RF amp. The mixer & local oscillator will
be
224A's, followed by TWO stages of IF amplification c/o (you guessed it)
another pair of 224A's. The detector will be a non-regenerative 224A, and
the BFO will be a Hartley oscillator 224A. The first stage of AF
amplification will be 227---this will drive a p-p pair of 245's.

A 280 full-wave rectifier will provide some 250 VDC to the different
stages---I may have to cobble-up some multi-transformer concoction to
provide the some 17+amperes (at 2.5 volts!) filament
requirements...probably
a combo of 5-volt center tapped transformers, with "stand alone" 2.5
volts
from whatever transformer(s) I might find here. Shouldn't be a problem...

I plan on making BOTH IF stages regenerative, a la a technique espoused
for
ARC receivers in the first edition of UNDERSTANDING AMATEUR RADIO...and
yes,
I plan to "cheat" a little by using some vintage, NOS large Meissner IF
transformers that I have here in the junque box.

RF gain will be provided by virtue of a 500-ohm "attenuator" pot in the
antenna lead, ahead of the RF amplifier (there will be NO AGC). The front
main tuning dial came from a very neat, ancient old British(?) LF
receiver---it's finished in black wrinkle paint, & the dial arcs 180
degrees. Very smooth action, & it certainly has that "1929" look.

The goal here is to have this thing finished and operational by the end
of
November, in time for use in the AWA 1929 QSO Party...

I'll certainly be more than happy to keep the gang posted on developments
here, should the interest (if any!) from others merit the effort...

BTW Walt, I sure do miss your nuggets in ELECTRIC RADIO
magazine---whenever
I research my older issues on topics of interest, more often than not the
pieces have been penned by you! Thanks...

~73!~ Eddy VE3CUI - VE3XZ





----- Original Message -----
From: <waltah@earthlink.net>
To: <hbr@mailman.qth.net>
Sent: Saturday, August 30, 2003 2:58 PM
Subject: [HBR] Another HBR Project -- Chapter 3


> Good progress this week.  Panel and chassis are done and power
> supply wiring is working.   The nearest thing to excitement was when
> the unused tap of one of the filament transformers shorted to the
> chassis and nearly cooked the thing.   The rest went smoothly
> including some tricky mechanical work for the command receiver
> plug-in coil unit -- glad that's behind me.
>
> The 6EW6 looks like a better local oscillator than the 6BH6 -- higher
> transconductance (14,000 vs. 4600) means less coupling needed
> between tube and tank circuit which means the tank has relatively
> better control over the frequency.   The price is greater heater power
> ... probably worth it since the layout allows keeping the heat pretty
> well away from the tank.
>
> W6TC certainly knew his practical theory:  using a pentode ECO not
> only gives you some isolation from the mixer but there's a lot of 2nd
> harmonic output and that's used in the HBR-series (as in similar
> commercial designs of the time) to get injection for the higher bands.
> It is a potential source of 'spurs' on 80-40 where the fundamental is
> used but with high-Q front end coils that should be a tolerable
> problem.
>
> Pictures -- captions follow each address:
>
> http://www.collie-rescuers.com/ebay/cistern3.jpg
>
> A first-rate workshop helps with these projects.
>
> http://www.collie-rescuers.com/ebay/hb1.jpg
>
> Chassis, panel, liberated 6-9.1 Mcs command receiver tuning cap.
>
> http://www.collie-rescuers.com/ebay/1stptst.jpg
> http://www.collie-rescuers.com/ebay/1stptsb.jpg
>
> Top and bottom views after 1st installation of parts -- +130 V, -160 V
> power supplies and filament transformers.   The negative voltage is
> needed for the AGC circuit.   Top view -- that's the output transformer
> between the two audio stages.   Other 'iron' L to R:  12VAC 1.2A
> xfmr, filter choke, 6.3-0-6.3 1.2A xfmr,  home made (primary x
> primary) 120VAC xfmr for plate supply.  Black objects in bottom view
> are filter caps.   The odd-shape socket (6U8 1st AF/phase splitter)
> is a Western Electric unit with three tie points mounted on each of
> two projections hanging off the sides -- very convenient when there
> are a bunch of parts to mount.   A flea market find ...
>
> Audio stages next.   I have been working about 5 hours a day so this
> might indeed be a 1 week project if one could go at it dawn to
> bedtime.
>
> Walt
> KJ4KV
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr

************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr

From hbr@mailman.qth.net  Sun Aug 31 21:55:15 2003
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 31 Aug 2003 16:55:15 -0400
Subject: [HBR] Yet Another HB Receiver Project
Message-ID: <3F522873.3180.1C94E37@localhost>

Eddy Swynar wrote:

> It's an 11-tube 1929-style superhet, as was inspired by TJ Lindsay's
> piece in the Antique Wireless Association's OLD TIMER'S BULLETIN of
> about a year ago...there ARE differences, however. 

Very cool project, not to say challenging, with the availability of parts
being as it is.   I'd certainly like to hear how it goes and see some
pictures.  What are you using for a chassis?  

As for the filaments, I'd think some of the AM boys would have a 
good size 5 VAC CT transformer squirrelled away somewhere -- 
some of the serious 'heavy iron' tubes have 5V filaments.   17 amps 
... wow ...  But that's a 5V 10A CT transformer -- I think that's not all 
that rare an item.   

Commercial receivers of that vintage most often used separate power 
supplies, did they not?  

My (much easier!) 10 tube project is going well -- the audio stages 
are working.   Detector next, possibly today.   That and the AGC are 
the last of the messy (many components per stage) work.   Both are 
plate detectors.

There will be an Electric Radio article on either this or the HBR2K 
project -- maybe both.   I enjoyed writing for ER, but life got so busy 
for a while there that there was no way to add writing and still have 
time for any radio activity to write about!  

Walt 
KJ4KV


