From kenw8ek at gmail.com  Tue Jan  1 15:00:38 2019
From: kenw8ek at gmail.com (Ken, W8EK)
Date: Tue, 1 Jan 2019 15:00:38 -0500
Subject: [AMRadio] Power Supplies FS
Message-ID: <406c5013-0137-62ef-1d77-6963b2596cb1@gmail.com>


Power Supplies For Sale:
..

..
Astron Power Supplies:

Astron power supplies are pretty much the standard
for ham use. They provide 13.8 V DC to power most
all of our equipment, and do it well.

Features:
Excellent Solid State Electronic Regulation
Fold Back Current Limiting
Crowbar Over Voltage Protection
Heavy Duty Heat Sink
Input Voltage 105-125Vac
Output Voltage nominal 13.8Vdc, but adjustable
Ripple under 5mV

I have several available:

VS-50 M - 37 amps continuous, 50 amps ICS
It has both an ammeter and a voltmeter. Current limiting
and output voltage are both adjustable from the front panel.
$200

Astron RS-35 M
25 Amps continuous, 35 Amps ICs,
with Voltmeter/Ammeter, $110

RS-20 A - 16 amps continuous, 20 amps ICS; $65

All of these work well and look close to new.
Tested output voltage varies from 0 to 0.02 volts
under load.

Pick up near Ocala is much preferred, especially
for the VS-50 M.
..

..

MFJ 4125, 25 amp power supply:

The MFJ-4125 Switching Power Supply has
switchable AC input voltage.
It weighs only 2.9 pounds and measures an
unbelievable 5?W x 2?H x 5?D.

Features:
25 Amps MAX, 22 Amps Continuous at 13.8 V DC
Lightweight, only 2.9 lbs.
Compact, only 5 ?" W x 2 ?" H x 5 ?" D
Five-Way binding post for high current radios
Quick-Connectors for low current accessories
Over Voltage protection
Over Current protection
Quiet Internal Cooling Fan
Input Voltage: Switchable AC Input Voltage
Works with AC input from 85 to 135 Vac
or from 170 to 260 Vac
AC Line Fused (5 Amps)
Super Regulation

This one works 100% and looks like new.
In fact, it may be new, but has been tested.

With paper work for $65.
..

..
Say Electronics SPS-20 M Power Supply:

This power supply is very heavy duty--MUCH heavier duty
than Astron power supplies. Parts are larger, but most important
is that Astron uses two 2N3771 pass transistors, while Say
uses four -- twice as many.

Rating is 20 amps continuous--not intermittent. Voltage is
variable from 3 V to 15 V DC. The current limit is set to
25 amps, and over voltage to 17 V DC. It has two meters --
an analog ammeter and a digital voltmeter.

This is a linear supply, so no switching noise.

This one works 100%, and looks the same.

Paper work is included for $105.
Pickup near Ocala, FL is much preferred.
..

..
Icom PS-20 Deluxe Power Supply / Speaker Combo:

The Icom PS20 is an external 20 amp switching power supply.
It was designed specifically for the IC-551, IC-701 and IC-720.
It has a special 3 pin connector used by these rigs, but it can
be used with any rig in the 100 Watt class. Although this is a
switching type power supply, it does not have any noticeable
switching noise. It is exceptionally well shielded, both with
mechanical shielding, and multiple filtering on all leads.

This device delivers up to 20 amps at 50% duty cycle. It has a
built-in speaker (125 x 77mm). The supply itself is 110 x 180
x 260 mm and weighs 4.2 kg.

This one works fine. It looks exceptionally nice.
With paper work for $120.
..

..
TenTec 280 Power Supply:

The TenTec 280 can furnish up to 20 amps at 13.8 V DC,
with 18 amps continuous. It is a very heavy duty, solid,
linear power supply.

Compared to the earlier 252 series power supplies, the 280
uses two pass transistors instead of one, and has really
great regulation.

It will power most any 100 W HF rig. It has a power
cord on it that terminates in a 4 pin in line Molex
connector that TenTec used for power for many years.

This one works fine, and looks great as well.

Paper work is included for $89.
..

..
19 Amp Switching Power Supply:

Radio Shack 22-5088 power supply rated at 13.8 V
DC at 19 amps.

It has overload, short circuit, temperature, and
over voltage protection built in.

It is a small lightweight power supply that can be
used on most any VHF or UHF rigs, and most HF
transceivers.

This one is NEW, completely unused, in its original
box for only $75.
..

..
Medium Current 13 V DC Power Supplies:

All work fine, and look fine.

Pyramid Phase III PS-12 regulated supply
Rated at 12 amps. Ideal for VHF and UHF rigs.
With paper work for only $40.

Say Electronics SPS-8 regulated supply
Following SEI's convention, this unit will supply
8 amps continuous. Front panel says 9.6 amps,
which would be ICAS rating. $35

Pyramid PS-7 regulated supply
7 amp supply,
modified with a large heat sink on the top cover.
This supply will run cool! $25

Stinger 6 amp regulated power supply
Up to 6 amps with good regulation. $28

Staco RPS-4, 4 amp supply
This one is still in its original box.
$22

All of the medium current supplies will fit in
a post office medium flat rate box.
..

..
Pace Communications 5803 Power Supply:

The Pace 5803 power supply is designed to be a bench type
power supply. It varies from about zero up to just over 15
Volts DC output, with up to 2.5 amps current capacity. The
front panel has both an analog voltmeter and analog
ammeter, both with a very soft back light. It also has a
control to vary the voltage, plus binding post output
connectors and switch.

Bottom line is that if you need a bench power supply
this one is ideal.

This one works fine, and looks great. I do not see any
scratches.

Only $35.
..

..
"Wall Wart" Power Supplies/Chargers:

All of these are "regular" wall warts - not the new noisy
switching type. Use one of these, and you will not need
to put up with all of the interference.

Icom BC-110 A Battery Charger for IC-W31 HT
12 V DC at 200 ma - Original Icom - $15

TenTec Model 48-15-800
15 V DC at 800 ma $15

MFJ 1312
12 V DC at 300 ma; has 2.5 mm plug with center positive; $12

Kenwood Charger for TH-225 HT; $10

Yaesu NC-9 B Charger
13 V DC at 45 ma, 2.5 mm plug; $12

There are many uses for the 12 volt DC variety.
These all have 2.1 mm coaxial connectors with center positive.
12 V DC at 1000 ma $17
12 V DC at 800 ma $15
12 V DC at 625 ma $14
12 V DC at 500 ma $12
12 V DC at 300 ma $10

12 Volt AC at 1 amp - Note it is AC, not DC. $15

9 V DC at 50 ma $8
9 V DC at 500 ma $12

..

..
I also have many other accessories available such as many
different types of microphones, HTs, VHF and UHF rigs, HF
and VHF/UHF antennas, connectors, miscellaneous accessories,
etc.
Just too many to list here. Please e-mail your requests.

..
Prices do not include shipping from Florida.

Thanks.

73,

Ken, W8EK

Ken Simpson
E-mail to W8EK at FLHam.net or W8EK at arrl.net
Voice Phone (352) 732-8400



..



..

From mjcal77 at yahoo.com  Sun Jan  6 21:52:29 2019
From: mjcal77 at yahoo.com (CL in NC)
Date: Mon, 7 Jan 2019 02:52:29 +0000 (UTC)
Subject: [AMRadio] 300B's Oh boy!
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>
Message-ID: <1988844198.13995839.1546829549390@mail.yahoo.com>

Well, if you have 700 bucks burning a hole in your pocket, here ya go....

http://www.westernelectric.com/

Charlie, W4MEC in NC

From donroden at hiwaay.net  Sun Jan  6 22:39:05 2019
From: donroden at hiwaay.net (donroden at hiwaay.net)
Date: Sun, 06 Jan 2019 21:39:05 -0600
Subject: [AMRadio] 300B's Oh boy!
In-Reply-To: <1988844198.13995839.1546829549390@mail.yahoo.com>
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>
	<1988844198.13995839.1546829549390@mail.yahoo.com>
Message-ID: <20190106213905.Horde.cbw4gx9fx4uTz2gIoSPz-Kc@webmail.hiwaay.net>

That's only about an hour's drive for me.   A matched Quad !!
On the way back, my cargo would be worth more than my SUV.
Dem Nawth Georgia Boys gonna sell a bunch to Nashville.

Don W4DNR



Quoting CL in NC via AMRadio <amradio at mailman.qth.net>:

> Well, if you have 700 bucks burning a hole in your pocket, here ya go....
>
> http://www.westernelectric.com/
>
> Charlie, W4MEC in NC
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Archives: http://mailman.qth.net/pipermail/amradio/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio at mailman.qth.net
> To unsubscribe, send an email to amradio-request at mailman.qth.net with
> the word unsubscribe in the message body.
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to donroden at hiwaay.net



From manualman at juno.com  Mon Jan  7 00:41:36 2019
From: manualman at juno.com (manualman at juno.com)
Date: Mon, 7 Jan 2019 00:41:36 -0500
Subject: [AMRadio] 300B's Oh boy!
Message-ID: <AABQDF3X2AQQV5WJ@smtpout03.vgs.untd.com>

That price is a hair above noise in the audio world. They pay $200 for an
AC line cord. A 8877(3CX1500A7) triode RF amplifier tube pricing starts
somewhere around $700 or $800 (used) and climbs all the way to over $2000
for new depending on where you buy one.

The Far East guys have been buying up the 300B's used and new stock and
building and selling monoblock audio amps for years at outstanding high
prices.

If you don't want to build a stereo high efficiency and high quality
amplifier, WECo is selling the 97-A monoblock amplifier with 8 300B's for
roughly $62K per pair. Of course, if you have a quad system or 5.1 or
7.1, the price will be considerably higher.
http://www.westernelectric.com/products/97a.html
Scroll down the page and view the underside wiring. No clip leads visible
here. Each monoblock weighs 165 pounds. That's heavier then my Johnson
Thunderbolt.

I think I'll stick with my two Eico HF-52 mono amplifiers for a little
while longer. I need to save up for my next wellness exam.

Pete, wa2cwa
www.manualman.com



On Mon, 7 Jan 2019 02:52:29 +0000 (UTC) CL in NC via AMRadio
<amradio at mailman.qth.net> writes:
> Well, if you have 700 bucks burning a hole in your pocket, here ya 
> go....
> 
> http://www.westernelectric.com/
> 
> Charlie, W4MEC in NC


From ranchorobbo at gmail.com  Mon Jan  7 06:02:45 2019
From: ranchorobbo at gmail.com (Rob Atkinson)
Date: Mon, 7 Jan 2019 05:02:45 -0600
Subject: [AMRadio] 300B's Oh boy!
In-Reply-To: <1988844198.13995839.1546829549390@mail.yahoo.com>
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>
	<1988844198.13995839.1546829549390@mail.yahoo.com>
Message-ID: <CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>

Oh, I heard of this guy a few years ago when he was starting out and
planning on doing this.  He must have bought the WECo brand from
someone, (similar was done with RCA) and built his tube factory.  I'm
glad hot glass is being made in USA again.  I wonder where he got the
Sealex equipment etc.   Maybe they're all blown and evacuated by hand
like that guy in France does.  Same thing is happening with vinyl
pressing in U.S.  I hope there's enough demand for these guys to stay
in business.  If they can at least make audio bottles that would be
great, although I won't be a customer.

It also remains to be seen if the new WECos hold up like the real ones.

I can definitely say that after years of HF radio listening, my ears
can't tell the difference between my old Eico HF-14 and the high
dollar high fi stuff.  I'll bet a tube amp with the same design and
parts but with 807s would sound the same to me as one of those 300B
jobs.   Bill KD0HG (SK) published a three part article in ER on a
homebrew home stereo audio amp system and his design took great pains
to make it flat and wide response.  He did a lot of research going
back to Williamson and it looked like a winner.  It was a three part
article starting in June 1993:  "A Premier Quality Homebrew Stereo
Amplifier."

Rob
K5UJ

On Sun, Jan 6, 2019 at 9:02 PM CL in NC via AMRadio
<amradio at mailman.qth.net> wrote:
>
> Well, if you have 700 bucks burning a hole in your pocket, here ya go....
>
> http://www.westernelectric.com/
>
> Charlie, W4MEC in NC
>

From ranchorobbo at gmail.com  Mon Jan  7 06:13:59 2019
From: ranchorobbo at gmail.com (Rob Atkinson)
Date: Mon, 7 Jan 2019 05:13:59 -0600
Subject: [AMRadio] 300B's Oh boy!
In-Reply-To: <CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>
	<1988844198.13995839.1546829549390@mail.yahoo.com>
	<CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
Message-ID: <CALWD7Z40gn7R0z=Ks3n0wB3=fJszsGpjW9J56Zqp_fTCKN0T_g@mail.gmail.com>

$550 for 100 feet of speaker cable tells us all we need to know....

Rob
K5UJ


>
> On Sun, Jan 6, 2019 at 9:02 PM CL in NC via AMRadio
> <amradio at mailman.qth.net> wrote:
> >
> > Well, if you have 700 bucks burning a hole in your pocket, here ya go....
> >
> > http://www.westernelectric.com/
> >
> > Charlie, W4MEC in NC
> >

From navy.radio at gmail.com  Mon Jan  7 07:59:44 2019
From: navy.radio at gmail.com (Nick England)
Date: Mon, 7 Jan 2019 07:59:44 -0500
Subject: [AMRadio] 300B's Oh boy!
In-Reply-To: <CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>
	<1988844198.13995839.1546829549390@mail.yahoo.com>
	<CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
Message-ID: <CAB55hNexf8PbLw3V2cMncVu5NsPWVEj+=i8Rq9kkxTmtzm3+7Q@mail.gmail.com>

Actually, they started by re-opening the WE tube manufacturing plant in
Kansas City.  They are now located in GA, I presume having moved the
manufacturing equipment.

On Mon, Jan 7, 2019 at 6:05 AM Rob Atkinson <ranchorobbo at gmail.com> wrote:

> Oh, I heard of this guy a few years ago when he was starting out and
> planning on doing this.  He must have bought the WECo brand from
> someone, (similar was done with RCA) and built his tube factory.  I'm
> glad hot glass is being made in USA again.  I wonder where he got the
> Sealex equipment etc.   Maybe they're all blown and evacuated by hand
> like that guy in France does.  Same thing is happening with vinyl
> pressing in U.S.  I hope there's enough demand for these guys to stay
> in business.  If they can at least make audio bottles that would be
> great, although I won't be a customer.
>
> It also remains to be seen if the new WECos hold up like the real ones.
>
> I can definitely say that after years of HF radio listening, my ears
> can't tell the difference between my old Eico HF-14 and the high
> dollar high fi stuff.  I'll bet a tube amp with the same design and
> parts but with 807s would sound the same to me as one of those 300B
> jobs.   Bill KD0HG (SK) published a three part article in ER on a
> homebrew home stereo audio amp system and his design took great pains
> to make it flat and wide response.  He did a lot of research going
> back to Williamson and it looked like a winner.  It was a three part
> article starting in June 1993:  "A Premier Quality Homebrew Stereo
> Amplifier."
>
> Rob
> K5UJ
>
> On Sun, Jan 6, 2019 at 9:02 PM CL in NC via AMRadio
> <amradio at mailman.qth.net> wrote:
> >
> > Well, if you have 700 bucks burning a hole in your pocket, here ya go....
> >
> > http://www.westernelectric.com/
> >
> > Charlie, W4MEC in NC
> >
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Archives: http://mailman.qth.net/pipermail/amradio/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio at mailman.qth.net
> To unsubscribe, send an email to amradio-request at mailman.qth.net with
> the word unsubscribe in the message body.
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to navy.radio at gmail.com
>
-- 
Nick England K4NYW
www.navy-radio.com

From w3slk at verizon.net  Mon Jan  7 21:20:45 2019
From: w3slk at verizon.net (Mike Sawyer)
Date: Mon, 7 Jan 2019 21:20:45 -0500
Subject: [AMRadio] 300B's Oh boy!
In-Reply-To: <CALWD7Z40gn7R0z=Ks3n0wB3=fJszsGpjW9J56Zqp_fTCKN0T_g@mail.gmail.com>
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>	<1988844198.13995839.1546829549390@mail.yahoo.com>	<CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
	<CALWD7Z40gn7R0z=Ks3n0wB3=fJszsGpjW9J56Zqp_fTCKN0T_g@mail.gmail.com>
Message-ID: <000801d4a6f8$c6404cf0$52c0e6d0$@verizon.net>

As Don, K4KYV calls them, "Audiophools!"

Mod-U-Lator,
Mike(y)/W3SLK

PS: Don't forget the tessatura that is developed by using 300B's!



-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rob Atkinson
Sent: Monday, January 7, 2019 6:14 AM
To: CL in NC
Cc: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] 300B's Oh boy!

$550 for 100 feet of speaker cable tells us all we need to know....

Rob
K5UJ


>
> On Sun, Jan 6, 2019 at 9:02 PM CL in NC via AMRadio
> <amradio at mailman.qth.net> wrote:
> >
> > Well, if you have 700 bucks burning a hole in your pocket, here ya
go....
> >
> > http://www.westernelectric.com/
> >
> > Charlie, W4MEC in NC
> >
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
Archives: http://mailman.qth.net/pipermail/amradio/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio at mailman.qth.net
To unsubscribe, send an email to amradio-request at mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to w3slk at verizon.net


From dennisgilliam at gmail.com  Mon Jan  7 21:27:26 2019
From: dennisgilliam at gmail.com (W7TFO .)
Date: Mon, 7 Jan 2019 19:27:26 -0700
Subject: [AMRadio] 300B
Message-ID: <CAFkB--Ogd1y1Ecbwree4FCuptNDcuOEWwshOWNC+_Za6cT+DXg@mail.gmail.com>

 To it's credit, the 300B (A too) is the only 40 Watt dissipation low-mu
glass triode...

The RCA type 50 was junk by comparison.

W7TFO

From nolantho at gmail.com  Mon Jan  7 21:35:10 2019
From: nolantho at gmail.com (Tom)
Date: Mon, 7 Jan 2019 21:35:10 -0500
Subject: [AMRadio] unsubscribe
Message-ID: <016401d4a6fa$c754b840$55fe28c0$@gmail.com>

 

 

Tom Nolan W3EX
MONTCO ARES EC
624 Store Road
Harleysville PA 19438
 <mailto:nolantho at gmail.com> nolantho at gmail.com
 <mailto:w3ex at arrl.net> w3ex at arrl.net
 <mailto:w3ex at winlink.org> w3ex at winlink.org

 


From w3slk at verizon.net  Wed Jan  9 21:43:21 2019
From: w3slk at verizon.net (Mike Sawyer)
Date: Wed, 9 Jan 2019 21:43:21 -0500
Subject: [AMRadio] 300B's Oh boy!
In-Reply-To: <CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>	<1988844198.13995839.1546829549390@mail.yahoo.com>
	<CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
Message-ID: <000001d4a88e$418ae0f0$c4a0a2d0$@verizon.net>

If I remember the article correctly, Bill came to the conclusion that 6CA7's
(aka EL34s) had the better S/N ratio vs. 6L6's which weren't too far behind.
For a person that listens to AM radio the nuances aren't going to be
detectable. Especially when you throw in atmospheric noise on top of it!
Eric, WB4VVI(sk), once told me that mostly multi-grid tubes, including the
venerable 807, were based off of the 6L6 design. Personally, I think a pair
of 6L6's in push-pull, (or 'shove-yank' as 'Slab' Frank, 'Bacon', KB4AHE
would say) are the 'bees knees' as a speech amp, audio amp, or guitar amp!

Mod-U-Lator,
Mike(y)/W3SLK



-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rob Atkinson
Sent: Monday, January 7, 2019 6:03 AM
To: CL in NC
Cc: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] 300B's Oh boy!

Oh, I heard of this guy a few years ago when he was starting out and
planning on doing this.  He must have bought the WECo brand from
someone, (similar was done with RCA) and built his tube factory.  I'm
glad hot glass is being made in USA again.  I wonder where he got the
Sealex equipment etc.   Maybe they're all blown and evacuated by hand
like that guy in France does.  Same thing is happening with vinyl
pressing in U.S.  I hope there's enough demand for these guys to stay
in business.  If they can at least make audio bottles that would be
great, although I won't be a customer.

It also remains to be seen if the new WECos hold up like the real ones.

I can definitely say that after years of HF radio listening, my ears
can't tell the difference between my old Eico HF-14 and the high
dollar high fi stuff.  I'll bet a tube amp with the same design and
parts but with 807s would sound the same to me as one of those 300B
jobs.   Bill KD0HG (SK) published a three part article in ER on a
homebrew home stereo audio amp system and his design took great pains
to make it flat and wide response.  He did a lot of research going
back to Williamson and it looked like a winner.  It was a three part
article starting in June 1993:  "A Premier Quality Homebrew Stereo
Amplifier."

Rob
K5UJ



From ranchorobbo at gmail.com  Thu Jan 10 06:30:49 2019
From: ranchorobbo at gmail.com (Rob Atkinson)
Date: Thu, 10 Jan 2019 05:30:49 -0600
Subject: [AMRadio] 300B's Oh boy!
In-Reply-To: <000001d4a88e$418ae0f0$c4a0a2d0$@verizon.net>
References: <1988844198.13995839.1546829549390.ref@mail.yahoo.com>
	<1988844198.13995839.1546829549390@mail.yahoo.com>
	<CALWD7Z6sscxL5Ji9Qruimr_n2g9HFoOjPq=Wp-1KadCFxiAR=w@mail.gmail.com>
	<000001d4a88e$418ae0f0$c4a0a2d0$@verizon.net>
Message-ID: <CALWD7Z53EeT8KaWWz08gfw2oWQBZO4K36r-zGydao-yddiCk0A@mail.gmail.com>

I tihnk the 807 is a 6L6 with a plate cap on top.   Only reason they
have not blown up in price is the glass audio latte sippers want
single ended tubes because h.v. freaks them out.

Rob
K5UJ

On Wed, Jan 9, 2019 at 8:43 PM Mike Sawyer <w3slk at verizon.net> wrote:
>
> If I remember the article correctly, Bill came to the conclusion that 6CA7's
> (aka EL34s) had the better S/N ratio vs. 6L6's which weren't too far behind.
> For a person that listens to AM radio the nuances aren't going to be
> detectable. Especially when you throw in atmospheric noise on top of it!
> Eric, WB4VVI(sk), once told me that mostly multi-grid tubes, including the
> venerable 807, were based off of the 6L6 design. Personally, I think a pair
> of 6L6's in push-pull, (or 'shove-yank' as 'Slab' Frank, 'Bacon', KB4AHE
> would say) are the 'bees knees' as a speech amp, audio amp, or guitar amp!
>
> Mod-U-Lator,
> Mike(y)/W3SLK

From ranickel at comcast.net  Mon Jan 14 21:01:59 2019
From: ranickel at comcast.net (Robert Nickels)
Date: Mon, 14 Jan 2019 20:01:59 -0600
Subject: [AMRadio] Modulator testing
Message-ID: <9a0c9835-8224-5c65-c42d-cf802f8a630c@comcast.net>

I'm testing a modulator running a pair of 811s, using a resistive load 
in place the final amplifier. ?? Normally both primary and secondary of 
the mod transformer have HV applied, so they are at the roughly the same 
DC potential above ground.? To make accurate measurements using a 
grounded oscilloscope,? I am wondering if it would be save to ground one 
side of the secondary where my resistive load is attached.??? Both 
windings are obviously rated to withstand high voltages? with respect to 
the frame,? but I can't find any manufacturer's name or part number on 
it, and while I assume the isolation between windings would be 
sufficient,? I'd hate to cause a problem.

Thanks and 73,
Bob W9RAN


From jcandela at prodigy.net  Mon Jan 14 22:50:51 2019
From: jcandela at prodigy.net (Jim Candela)
Date: Tue, 15 Jan 2019 03:50:51 +0000 (UTC)
Subject: [AMRadio] Modulator testing
In-Reply-To: <9a0c9835-8224-5c65-c42d-cf802f8a630c@comcast.net>
References: <9a0c9835-8224-5c65-c42d-cf802f8a630c@comcast.net>
Message-ID: <1981738620.251384.1547524251236@mail.yahoo.com>

 Bob,
?? I would not do that. It was wise to hesitate. It is usually unknown how much voltage can be applied between the primary and secondary windings. I once wanted to do the same thing with a quad of 808's in push pull parallel. Fair Radio used to see the 808's for 75 cents apiece. What I did was to hook up the HV windings to a big plate transformer, and then load the AC line side with a resistance that took into account the turns ratio of the plate transformer (impedance varies as the square of the turns ratio).
This is not ideal, but no faults occurred.
Don't even think about floating the scope!! NO!!

JimWd5JKO

    On Monday, January 14, 2019, 8:02:14 PM CST, Robert Nickels <ranickel at comcast.net> wrote:  
 
 I'm testing a modulator running a pair of 811s, using a resistive load 
in place the final amplifier. ?? Normally both primary and secondary of 
the mod transformer have HV applied, so they are at the roughly the same 
DC potential above ground.? To make accurate measurements using a 
grounded oscilloscope,? I am wondering if it would be save to ground one 
side of the secondary where my resistive load is attached.??? Both 
windings are obviously rated to withstand high voltages? with respect to 
the frame,? but I can't find any manufacturer's name or part number on 
it, and while I assume the isolation between windings would be 
sufficient,? I'd hate to cause a problem.

Thanks and 73,
Bob W9RAN

______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
Archives: http://mailman.qth.net/pipermail/amradio/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio at mailman.qth.net
To unsubscribe, send an email to amradio-request at mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to jcandela at prodigy.net  

From ranickel at comcast.net  Mon Jan 14 23:34:07 2019
From: ranickel at comcast.net (Robert Nickels)
Date: Mon, 14 Jan 2019 22:34:07 -0600
Subject: [AMRadio] Modulator testing
In-Reply-To: <1981738620.251384.1547524251236@mail.yahoo.com>
References: <9a0c9835-8224-5c65-c42d-cf802f8a630c@comcast.net>
	<1981738620.251384.1547524251236@mail.yahoo.com>
Message-ID: <b5fc9df5-c0ef-d9eb-1b23-25c23510c8dc@comcast.net>

On 1/14/2019 9:50 PM, Jim Candela wrote:
>
> Don't even think about floating the scope!! NO!!

Yeah, a tech who worked for me once had a very bad experience floating a 
scope on a test system that was run by an HP-85 instrument 
controller.??? Voltage found it's way? to ground alright -? the best 
path turned out to be smack in the middle of the IEEE-488 interface 
module, which not being designed for AC service, proceeded catch fire 
and prompted an interview with the plant fire brigade leader (who I know 
secretly loved being able to discharge an entire extinguisher into our 
cabinet).???? The tech did not love having to rebuild it...

However, as Nick pointed out, at 100% modulation the AC voltage from the 
modulator just cancels the DC voltage from the power supply, which 
effectively puts the voltage difference between the primary and 
secondary windings? equal to the power supply voltage.?? I've also had 
confirmation from others but wanted to be cautious.

73, Bob W9RAN


From mjcal77 at yahoo.com  Tue Jan 15 08:57:54 2019
From: mjcal77 at yahoo.com (CL in NC)
Date: Tue, 15 Jan 2019 13:57:54 +0000 (UTC)
Subject: [AMRadio] Hope for your BC375/BC191 project
References: <120685924.490023.1547560674800.ref@mail.yahoo.com>
Message-ID: <120685924.490023.1547560674800@mail.yahoo.com>

I know, this should be on the milsurp site, but have been unable to send stuff to it, so here it is.  China, of course, has a company that is making VT4C's/211's for the audio market.  A matched set of 4 is $288, pretty good considering they normally go for 160 each at places like ESRC, and I have seen them on ePay for up to $1700 each.  Audiophiles are true suckers sometimes.  Tubes and More sells the same brand, and there is one review from a ham, he put his name and callsign on the review, and it appears he did use them in a milsurp TX.  His call was good in QRZ, but he had no email to ask him more questions.  You can buy them one at a time from Tubes and More also for around 70 bucks each.

Charlie, W4MEC in NC

From ranickel at comcast.net  Wed Jan 16 16:35:05 2019
From: ranickel at comcast.net (Robert Nickels)
Date: Wed, 16 Jan 2019 15:35:05 -0600
Subject: [AMRadio] Modulator testing
In-Reply-To: <1981738620.251384.1547524251236@mail.yahoo.com>
References: <9a0c9835-8224-5c65-c42d-cf802f8a630c@comcast.net>
	<1981738620.251384.1547524251236@mail.yahoo.com>
Message-ID: <e4274178-69db-230c-a862-bc0384009980@comcast.net>

To close the loop on this issue, it turned out that the very thing I was 
hoping to avoid led me to discover the problem.?? I decided to ground 
one side of the mod transformer secondary which was disconnected from 
the RF deck and only connected to my resistive load in order to get 
accurately characterize the modulator.?? But the 10A plate HV fuse blew 
instantly! ? An ohmmeter check confirmed the obvious conclusion? - the 
transformer has a 120 ohm short between primary and secondary.??? I'd 
measured the individual windings many times but hadn't thought to check 
between windings.?? I even thought about hi- potting the thing, but 
since there was no arcing or breakdown I didn't, although I probably 
would have caught it if I had.

The transmitter in question is an Eldico TR1-TV, which is pretty 
uncommon and the only other one I know of has had its mod transformer 
replaced too.? I put in a mod transformer from an ART-13 which is 
working? much better - with 100% negative peaks and 50-60% positive 
peaks.??? When I got the transmitter the original plate tank coil was 
missing,? so I've been trying to figure out the correct inductance and 
tap points,? - a process that was complicated by (and contributing to) 
the low modulation problem.??? So I still have some optimization work to 
do but it's always good to find a definite problem, even if it's in an 
unobtainium part like this mod transformer.

And then while testing the Millen HV connector zorched itself. No doubt 
the worst product the James Millen name appeared on.

73, Bob W9RAN


From w5jo at brightok.net  Thu Jan 31 08:51:32 2019
From: w5jo at brightok.net (w5jo at brightok.net)
Date: Thu, 31 Jan 2019 07:51:32 -0600
Subject: [AMRadio] 6L6
Message-ID: <5754F06418A14434B88A6DB7BBA44013@JimPC>

Does anyone have a metal 6L6 they would trade for a glass one?

Jim
W5JO

From ron.k3pid at sbcglobal.net  Thu Jan 31 20:24:29 2019
From: ron.k3pid at sbcglobal.net (Ron.K3PID)
Date: Thu, 31 Jan 2019 19:24:29 -0600
Subject: [AMRadio] 6L6
In-Reply-To: <5754F06418A14434B88A6DB7BBA44013@JimPC>
References: <5754F06418A14434B88A6DB7BBA44013@JimPC>
Message-ID: <55CEE40640AB41F7A896CA7B29C136FD@Zeus>

I have a couple of them Jim. Let me test them and if they are OK, They are 
yours no trade required just promise that you'll put them to good use hi hi. 
I'll set up the tester over the weekend and let you know.

Ron K3PID

-----Original Message----- 
From: w5jo at brightok.net
Sent: Thursday, January 31, 2019 7:51 AM
To: AM Radio List
Subject: [AMRadio] 6L6

Does anyone have a metal 6L6 they would trade for a glass one?

Jim
W5JO
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
Archives: http://mailman.qth.net/pipermail/amradio/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio at mailman.qth.net
To unsubscribe, send an email to amradio-request at mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to ron.k3pid at sbcglobal.net 


From randyn3lrx at gmail.com  Thu Jan 31 20:34:21 2019
From: randyn3lrx at gmail.com (Randy Berry)
Date: Thu, 31 Jan 2019 20:34:21 -0500
Subject: [AMRadio] 2019 AM Rally
Message-ID: <CANoMxYR0dRazH1eWFUOGM+opZ0sA6kMAR5qAe7SJW-Y9v2EGaQ@mail.gmail.com>

Don't forget the AM Rally this weekend!
Open to all who can generate a modulated carrier! From QRP to QRO!
http://www.amrally.com for all the info and rules!
I can't transmit this year *sigh* but I will be listening!

-- 
tnx es 73 de Randy, N3LRX/8
https://n3lrx.com

From w5jo at brightok.net  Thu Jan 31 20:49:54 2019
From: w5jo at brightok.net (w5jo at brightok.net)
Date: Thu, 31 Jan 2019 19:49:54 -0600
Subject: [AMRadio] 6L6
In-Reply-To: <55CEE40640AB41F7A896CA7B29C136FD@Zeus>
References: <5754F06418A14434B88A6DB7BBA44013@JimPC>
	<55CEE40640AB41F7A896CA7B29C136FD@Zeus>
Message-ID: <9C52387DDA934909B0D861EA0AEB5FDD@JimPC>

Nice of you Ron,

I need only one for my GK 500A.  The tube is adjacent to a transformer in 
the modulator deck and I don't want any magnetic coupling to it.

So if you have one that that would be fine and you can save the other for 
someone else who may need it.  The one in my transmitter came with it new in 
54.  It is getting weak.

Thanks so much.  I would be happy to send you one or two glass versions in 
trade I have several, some are Russian, but I ran them through my Western 
Electric tester and they check very good.

73,

Jim
W5JO

-----Original Message----- 


I have a couple of them Jim. Let me test them and if they are OK, They are
yours no trade required just promise that you'll put them to good use hi hi.
I'll set up the tester over the weekend and let you know.

Ron K3PID

-----Original Message----- 


Does anyone have a metal 6L6 they would trade for a glass one?

Jim
W5JO
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
Archives: http://mailman.qth.net/pipermail/amradio/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio at mailman.qth.net
To unsubscribe, send an email to amradio-request at mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to ron.k3pid at sbcglobal.net 


