[Hammarlund] Hammarlund Digest, Vol 102, Issue 7
Chuck Hurley
scorebrd at verizon.net
Wed Jul 25 16:37:57 EDT 2012
I have the vacuum formed lenses available
Chuck
K1TLI
508-965-7400
-----Original Message-----
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Sent: Wednesday, July 25, 2012 3:42 PM
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Subject: Hammarlund Digest, Vol 102, Issue 7
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Today's Topics:
1. Re: Hammarlund Lens cover (Al Parker)
2. Re: Fwd: Re: Super Pro bias supply (Richard Knoppow)
3. Re: Bias supply zorching the audio driver transformer
(Todd, KA1KAQ)
4. FS : HQ170,HQ129 (GRG)
5. Re: Bias supply zorching the audio driver transformer
(Kenneth G. Gordon)
6. HQ-110 (Paul Kraemer)
7. Re: Bias supply zorching the audio driver transformer
(Richard Knoppow)
8. Re: Bias supply zorching the audio driver transformer
(Todd, KA1KAQ)
----------------------------------------------------------------------
Message: 1
Date: Wed, 25 Jul 2012 12:59:27 -0400
From: Al Parker <anchor at ec.rr.com>
Subject: Re: [Hammarlund] Hammarlund Lens cover
To: David Thompson <thompson at mindspring.com>
Cc: hammarlund at mailman.qth.net
Message-ID: <501025EF.50708 at ec.rr.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Dave,
I'm not sure if this is still current, but you can check:
======================
Clock crystals
E. C. (El) Spencer, W8VHF
2074 W Fountain Rd
Scottville, MI 49454
w8vhf at t-one.net
El still has vacuum formed crystals (lenses) available, as of 2/05
======================
I believe there's been someone else advertising them, maybe in ER.
73,
Al, W8UT
www.boatanchors.org
www.hammarlund.info
"There is nothing -- absolutely nothing -- half so much worth doing as
simply messing about in boats"
Ratty, to Mole
On 7/24/2012 10:18 PM, David Thompson wrote:
> I just got an HQ-110C to match up with my HC-10 and the clock is good
> but I am loking for a lens cover. I have WA0ABI is an old list as
> someone who sells them but he has no e-mail address in QRZ.
>
> I am looking for another source.
>
> 73 Dave K4JRB
>
>
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------------------------------
Message: 2
Date: Wed, 25 Jul 2012 09:58:56 -0700
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
Subject: Re: [Hammarlund] Fwd: Re: Super Pro bias supply
To: "hammarlund" <hammarlund at mailman.qth.net>, <ve3ajm at gmail.com>
Message-ID: <137C6CBD8D9D4FB9BA3B263E2232E652 at VALUED20606295>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
----- Original Message -----
From: <ve3ajm at gmail.com>
To: "hammarlund" <hammarlund at mailman.qth.net>
Sent: Wednesday, July 25, 2012 6:45 AM
Subject: [Hammarlund] Fwd: Re: Super Pro bias supply
>
>
> Sent from my HTC
>
> ----- Forwarded message -----
> From: "ve3ajm at gmail.com" <ve3ajm at gmail.com>
> To: <wrcromwell at gmail.com>
> Subject: Re: [Hammarlund] Super Pro bias supply
> Date: Wed, Jul 25, 2012 9:43 am
>
>
> A fuse would help protect the driver transformer. Shunt
> feeding the transformer would remove the DC from it
> complely too.
>
> Al
I suspect the choice of driver was made to insure a
low impedance path for the grid current. Hammarlund may have
chosen AB2 to increase the power available from the
amplifier but it complicates the grid drive requirements
since the driver must supply a small amount of power to the
final grids. A fuse in the B+ would probably protect the
transformer. Of course, one could completely replace the
audio amplifier stage with something more modern:-)
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com
------------------------------
Message: 3
Date: Wed, 25 Jul 2012 13:08:02 -0400
From: "Todd, KA1KAQ" <ka1kaq at gmail.com>
Subject: Re: [Hammarlund] Bias supply zorching the audio driver
transformer
To: Al Santangelo <ve3ajm at gmail.com>
Cc: hammarlund <hammarlund at mailman.qth.net>
Message-ID:
<CANCs6AUMKZy2jfGTPYBb6SBfmyuhtW0_M897x6w6gokJhPOt3Q at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Tue, Jul 24, 2012 at 8:37 PM, Al Santangelo <ve3ajm at gmail.com> wrote:
> Hi Todd,
>
> Great to meet up with you here OM. Hope to hear/work you soon on 75 or
> 40m for sure. The group is still going strong.
>
> I know it was mentioned to be careful about the bias supply and
> damaging the audio driver transformer in the Super Pros.
>
> I was just looking at the schematic for the SP-400X and I see that the
> schematic shows the use of cathode bias on the PP 6F6s. ie. the centre
> tap of the secondary of the driver transformer is grounded.
> I don"t the SP-210 schematic here, so I'm thinking that this is one
> other difference between the 400 and the earlier SPs?
>
As others have covered Al, the circuit is basically the same across the
series. The 400, like the 129, were basically dressed up versions of the
original 200 and 120 pre-war models that allowed Hammarlund to have
something to offer quickly postwar.
I have never come across a set with the audio failure you describe. I would
be a few folks presented improper loads through speaker choice, though, not
knowing if their set was 600 or 8 ohm. I do have a pre-war 200SX here that
someone started to gut the audio section from. Fortunately the iron is
still in place. Have seen a few with the audio section complete gone, no
way of knowing if a roached transformer was the reason or the typical
mod-of-the-day approach promoted in the 50s-60s.
To frequency coverage, there was speculation for a while that the low
frequency was offered but not produced until the 200 came along. This was
found to be false when W3JN landed a SP-100L at Timonium a few years back.
An amusing story behind it. The coverage differs slightly from some of the
SP-100 ads, but it does exist. Not sure if any SP-10Ls were ever built. The
-10 wasn't in production long before the updated 100 replacement came
along. Less than a year, I think.
It's interesting to watch the progression, from all glass 'big pin' tubes
in the SP-10 to a combination glass and metal octals in the 100, to all
metal octals in the 200. Also the change from R meter to S meter.
They are really neat rigs, especially for their time. You'll enjoy yours a
lot once they are online, Al. I have the SP-100X next to the bed where it
is usually tuned to AM740 near you. They pound in down here most nights.
~ Todd/KAQ
------------------------------
Message: 4
Date: Wed, 25 Jul 2012 13:38:38 -0500
From: GRG <w5grg at w5grg.net>
Subject: [Hammarlund] FS : HQ170,HQ129
To: hammarlund at mailman.qth.net
Message-ID: <50103D2E.9020505 at w5grg.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Both are a bit rough and I am not sure of the current working condition
so I would say they are best for parts, I am thinking of disassembling
them and putting the parts on ebay or this list.
I can pack and ship but not for free if anyone is interested, let me know.
Thanks, George W5GRG, AFA6GG
------------------------------
Message: 5
Date: Wed, 25 Jul 2012 11:55:58 -0700
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
Subject: Re: [Hammarlund] Bias supply zorching the audio driver
transformer
To: hammarlund <hammarlund at mailman.qth.net>
Message-ID: <5010413E.5050.5F5A739F at kgordon2006.frontier.com>
Content-Type: text/plain; charset=US-ASCII
On 25 Jul 2012 at 13:08, Todd, KA1KAQ wrote:
> I do have a
> pre-war 200SX here that someone started to gut the audio section from.
> Fortunately the iron is still in place. Have seen a few with the audio
> section complete gone, no way of knowing if a roached transformer was
> the reason or the typical mod-of-the-day approach promoted in the
> 50s-60s.
That undoubtedly is the beginnings of a project from an article in some ham
mag, I don't remember which at the moment, entitled "The Ultimate Super
Pro".
The entire audio section was hacked out, leaving a 1/4" lip around the space
on which a piece of aluminum was placed and on which was then mounted
an internal power supply and a really wimpy single-6AQ5 audio stage.
There were other, much more "destructive" mods included in that article,
along with one possibly valuable or useful one.
I cannot understand the thinking in that article.
I have one complete example of that "Ultimate Super Pro" here in the form of
what was once a very nice BC-779. In addition I have one completely
untouched BC-779 with original power supply, and a pretty beaten up one
which is restorable and which was given to me by my nephew who found it in
a dump in Butte, Montana.
I have always considered the Hammarlund receivers to be unusually good
receivers, and rather forward-looking for their various time periods. They
were always more expensive than most other receivers of their time periods
too.
Back in the 1960s sometime, I was given a completely unused BC-779 with
original power supply. I mounted it in a nice rack I had then.
I suspect now that there was something wrong in the BFO or its
interconnections to the following stages since the BFO injection was
horribly
low, making it almost impossible to copy CW, let alone SSB.
I converted the 6N7 noise limter tube into a triode product detector, and
was
amazed at the resulting improvement (as I have mentioned many times).
The sensistivity and quietness of that receiver after that mod (despite that
crappy, noisy 1st mixer stage) was literally startling to me!
I could hear signals I didn't even know existed before that, and used that
receiver for several years afterwards as my main RTTY receiver.
I never turned it off, and it would drift back and forth a few Hz on 20
meters
all the time. I thought even that made it sound pleasant.
vy 73,
Ken W7EKB
------------------------------
Message: 6
Date: Wed, 25 Jul 2012 14:06:06 -0500
From: "Paul Kraemer" <elespe at lisco.com>
Subject: [Hammarlund] HQ-110
To: <hammarlund at mailman.qth.net>
Message-ID: <EB5BBFC34A514E5FAFE33C43ED591903 at ENGR2>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
I have a long time friend with a pretty nice HQ-110 for sale.
He went through this radio, re-built the if cans with sm caps, and in
process of final alignment broke a slug. I guess it also broke the camels
back because now he just wants rid of it. No reasoning with him. Says he is
just going to part it out which tears me up because this 110 is much too
nice to trash. I would have taken it off his hands but, I already have a
full house.
Maybe someone can lighten Dave's load. It really is pretty nice cosmetic
condition, electrically too. Just a broken slug.
Contact Dave direct davidjmessing at gmail.com or K0RWM in QRZ
Thanks
Paul K0UYA
------------------------------
Message: 7
Date: Wed, 25 Jul 2012 12:38:02 -0700
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
Subject: Re: [Hammarlund] Bias supply zorching the audio driver
transformer
To: "Todd, KA1KAQ" <ka1kaq at gmail.com>, "Al Santangelo"
<ve3ajm at gmail.com>
Cc: hammarlund <hammarlund at mailman.qth.net>
Message-ID: <C100E24A2B474C098E28FF6567A13C96 at VALUED20606295>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
----- Original Message -----
From: "Todd, KA1KAQ" <ka1kaq at gmail.com>
To: "Al Santangelo" <ve3ajm at gmail.com>
Cc: "hammarlund" <hammarlund at mailman.qth.net>
Sent: Wednesday, July 25, 2012 10:08 AM
Subject: Re: [Hammarlund] Bias supply zorching the audio
driver transformer
> On Tue, Jul 24, 2012 at 8:37 PM, Al Santangelo
> <ve3ajm at gmail.com> wrote:
>
>> Hi Todd,
>>
>> Great to meet up with you here OM. Hope to hear/work you
>> soon on 75 or
>> 40m for sure. The group is still going strong.
>>
>> I know it was mentioned to be careful about the bias
>> supply and
>> damaging the audio driver transformer in the Super Pros.
>>
>> I was just looking at the schematic for the SP-400X and I
>> see that the
>> schematic shows the use of cathode bias on the PP 6F6s.
>> ie. the centre
>> tap of the secondary of the driver transformer is
>> grounded.
>> I don"t the SP-210 schematic here, so I'm thinking that
>> this is one
>> other difference between the 400 and the earlier SPs?
>>
>
> As others have covered Al, the circuit is basically the
> same across the
> series. The 400, like the 129, were basically dressed up
> versions of the
> original 200 and 120 pre-war models that allowed
> Hammarlund to have
> something to offer quickly postwar.
>
> I have never come across a set with the audio failure you
> describe. I would
> be a few folks presented improper loads through speaker
> choice, though, not
> knowing if their set was 600 or 8 ohm. I do have a
> pre-war 200SX here that
> someone started to gut the audio section from. Fortunately
> the iron is
> still in place. Have seen a few with the audio section
> complete gone, no
> way of knowing if a roached transformer was the reason or
> the typical
> mod-of-the-day approach promoted in the 50s-60s.
>
> To frequency coverage, there was speculation for a while
> that the low
> frequency was offered but not produced until the 200 came
> along. This was
> found to be false when W3JN landed a SP-100L at Timonium a
> few years back.
> An amusing story behind it. The coverage differs slightly
> from some of the
> SP-100 ads, but it does exist. Not sure if any SP-10Ls
> were ever built. The
> -10 wasn't in production long before the updated 100
> replacement came
> along. Less than a year, I think.
>
> It's interesting to watch the progression, from all glass
> 'big pin' tubes
> in the SP-10 to a combination glass and metal octals in
> the 100, to all
> metal octals in the 200. Also the change from R meter to S
> meter.
>
> They are really neat rigs, especially for their time.
> You'll enjoy yours a
> lot once they are online, Al. I have the SP-100X next to
> the bed where it
> is usually tuned to AM740 near you. They pound in down
> here most nights.
>
> ~ Todd/KAQ
There is another change which might be of importance in
getting old Super-Pro receivers to work. The power supply
for those before the SP-400-X were arranged to power a
loudspeaker field which was also used as a second filter
choke. If the supply is used without a speaker field it
should be replaced with a choke or resistor of the right
value. the SP-200 manual says that there was a "special"
supply for use without the fieldcoil which contained a
second choke. The military power supplies all have two
chokes. The SP-400 supply is of this type. The terminals for
the speaker field should NOT just be linked since the lower
voltage B+ will be too high. If it is open no voltage will
get to anything but the power output stage.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com
------------------------------
Message: 8
Date: Wed, 25 Jul 2012 15:42:11 -0400
From: "Todd, KA1KAQ" <ka1kaq at gmail.com>
Subject: Re: [Hammarlund] Bias supply zorching the audio driver
transformer
To: kgordon2006 at frontier.com
Cc: hammarlund <hammarlund at mailman.qth.net>
Message-ID:
<CANCs6AV7E81q99dV1rKVJckRnx45jibVciAGjLKh2zCQpvEtwg at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Wed, Jul 25, 2012 at 2:55 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:
>
> The entire audio section was hacked out, leaving a 1/4" lip around the
> space
> on which a piece of aluminum was placed and on which was then mounted
> an internal power supply and a really wimpy single-6AQ5 audio stage.
>
> There were other, much more "destructive" mods included in that article,
> along with one possibly valuable or useful one.
>
> I cannot understand the thinking in that article.
>
By today's standards, it certainly makes no sense, Ken. It took me a while
to figure out a sensible explanation beyond the simple 'It's mine, I can do
what I want with it' issue which is fine. My epiphany came about after
reading endless rants about military surplus gear being hacked up by a
'bunch of nitwit ham hackers' or such.
Today we're a bit spoiled, for lack of a better description, by the
availability of old radio gear. As well, disposable income levels are much
higher than decades ago, even in the current political mess. Not so in the
50s-60s when much of this old gear wasn't state-of-the-art, but still
fairly current and in wide use. Buying a Super Pro back in the day, even
surplus, had to cost a whole lot more than today, comparatively-speaking.
For a new Novice or General upgrade with maybe a paper route, lawn mowing
jobs or similar, or a father with a family to feed, it took a while to save
up the needed funds. Rather than cheap examples by the dozen laying around
multiple hamfests, you had to seek them out through magazine ads, other
amateurs in your area, surplus stores, whatever worked.
Once you got a nice rig, you kept it for a while. This no doubt meant
'updating' to improve performance: adding product detectors, better/quieter
tubes, all of what we see in modified examples. You didn't just go snap up
a newer radio for a few bucks.
Though I wasn't around in the 50s, I'd guess the attraction of making a
big, kludgey receiver with a separate supply into something using new
miniature tubes that allowed mounting a power supply on the chassis, and
changing the P-P audio to a single-ended 6AQ5 (who cared about fidelity on
the ham bands?) was attractive to many hams. Sort of like making your old,
obsolete set into a newer, sportier model.
Some are still in that mindset, wanting to make any change they can to
'improve' the radio into something it was never designed to be. More power
to 'em, so long as it's something you enjoy and don't feel obligated to do.
My approach is just to enjoy the technology as intended. If it lacks some
feature or noise figure or whatever else that I deem important for my
needs, I'll go find something else that provides it. We have that luxury
with cheap tube gear readily available. From all I've seen and read, that
wasn't the case back in the day. Even "cheap surplus" isn't as cheap as it
seems when adjusted for inflation.
Of course, folks like you and Carl got to see this all first hand, Ken. It
must've been something to behold!
~ Todd/KAQ
------------------------------
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