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Re: [Amps] Multi tube amp

To: amps@contesting.com
Subject: Re: [Amps] Multi tube amp
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 12 Dec 2017 02:23:18 -0500
List-post: <mailto:amps@contesting.com>
Find the transformers used in the old, tube type color RV sets. Many of them will power 200W out (or more). So you need a few transformers and they aren't as plentiful as in the past, but a passel of them will provide power for Carl's suggestion.

IIRC the old Dentron GLA1000 used 6 sweep tubes for 800 to 100 watts out.  It's been so long I've forgotten the tubes or power. Over working the elements certainly does shorten tube life and usually raises IMD. You need look no farther than amplifiers claiming more output power than the tubes are rared to handle and the complaints about short tube life.
Those were more simple days even if we were limited to 1KW DC input.

73, Roger (K8RI)

On 12/11/2017 Monday 9:51 AM, Carl wrote:
Even if it was possible pushing the INTERNAL parts that hard would radically shorten life.

Why not use a variety of oddball filament voltage BIG sweep tubes that are still dirt cheap NIB at hamfests, etc? For the lower bands each one can be a different version as long as the Pd is the same or close. Filaments can be run right off the AC line in series parallel with balancing resistors if needed.

Eight 35W tubes equal 4 811A's at about half the plate voltage making the PS cheaper. Use a surplus 120 to 240V step up transformer and a tripler, those go begging at electronic surplus shops, hamfests and Fleabay, etc.

Another choice is the 4D32 with plenty still available after the USAF released thousands into the surplus market. There are only 3 ham TX that used them that I'm aware of:;  Collins 32V series, Hallicrafters HT-20, and Johnson Viking I and they last a long time there.

Run 4 in swamped grid AB2 or Super Cathode driven for an easy 600W out at ~ 750V.

Lets all do more building

Carl
----- Original Message ----- From: "Gary Schafer" <garyschafer@largeriver.net> To: "'Herbert Schoenbohm'" <herbert.schoenbohm@gmail.com>; "'KA9EGW'" <ka9egw@ka9egw.com>; <amps@contesting.com>
Sent: Sunday, December 10, 2017 5:48 PM
Subject: Re: [Amps] Multi tube amp


That's been done with 6AG7's but a 6L6 won't work in GG because it has an
internal connected beam forming element/suppressor.

73
Gary  K4FMX

-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Herbert
Schoenbohm
Sent: Wednesday, December 06, 2017 7:08 AM
To: KA9EGW; amps@contesting.com
Subject: Re: [Amps] Multi tube amp

If you can get some metal 6L6's for a reasonable price at a flee market,
you can turn the amp upside down and place it in a large pan of water
and
really run some power to a bunch of them.  A true HB water cooled amp
with
a very low plate impedance and low drive requirements.

Herb, KV4FZ

On Tue, Dec 5, 2017 at 5:32 PM, KA9EGW <ka9egw@ka9egw.com> wrote:

> Seems to me there was also one in strays that use something like a
dozen
> 1625's on parallel
>
> Sent from my device that creates typos
>
> > On Dec 5, 2017, at 09:05, amps-request@contesting.com wrote:
> >
> > Send Amps mailing list submissions to
> >    amps@contesting.com
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> >    http://lists.contesting.com/mailman/listinfo/amps
> > or, via email, send a message with subject or body 'help' to
> >    amps-request@contesting.com
> >
> > You can reach the person managing the list at
> >    amps-owner@contesting.com
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Amps digest..."
> >
> >
> > Today's Topics:
> >
> >   1. Re: amplifier in 1960's QST (Paul Christensen)
> >   2. Re: MFJ products (Jim Thomson)
> >   3. Re: MFJ products (John Bodine)
> >   4. Re: MFJ products (Shon Edwards)
> >
> >
> > --------------------------------------------------------------------
--
> >
> > Message: 1
> > Date: Mon, 4 Dec 2017 20:54:32 -0500
> > From: "Paul Christensen" <w9ac@arrl.net>
> > To: <amps@contesting.com>
> > Subject: Re: [Amps] amplifier in 1960's QST
> > Message-ID: <004101d36d6b$ff519020$fdf4b060$@arrl.net>
> > Content-Type: text/plain;    charset="us-ascii"
> >
> > Possibly the Galaxy 2000+.  A full description was authored by
Wilfred
> > Scherer, W2AEF and appears on p. 17 in the January, 1967 issue of CQ > > Magazine.    A total of <gulp> ten (10) 6HF5 sweep tubes are used in
> > parallel.  The design also makes use of a dynamic linearizer by
sampling
> > input and output RF voltage.  Non-linearity produces a voltage
that's
> then
> > applied to a series regular in the bias supply.
> >
> > Paul, W9AC
> >
> > -----Original Message-----
> > From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Carl
> > Sent: Monday, December 4, 2017 7:53 PM
> > To: Fuqua, Bill L <wlfuqu00@uky.edu>; amps@contesting.com
> > Subject: Re: [Amps] amplifier in 1960's QST
> >
> > I vaguely remember the article and the tube load was 50 Ohms so
there
> was no
> > Load control!!
> >
> > WRL or Globe had a something 2000 that was all sweep tubes.
> >
> > Carl
> >
> >
> > ----- Original Message -----
> > From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
> > To: <amps@contesting.com>
> > Sent: Monday, December 04, 2017 12:06 PM
> > Subject: [Amps] amplifier in 1960's QST
> >
> >
> >> I have been looking for an article about a suitcase kW amplifier
using a
> >> load of sweep tubes. directly off power line power supply (voltage
> >> multiplier) and a broadband matching network. Not interested in
building
> >> one because there are all sorts of problems with the idea. I think
it
> was
> >> in late 60's but I can't find it. Perhaps it was not QST.
> >>
> >> Anyone remember it?
> >>
> >>
> >> 73
> >>
> >> Bill wa4lav
> >>
> >> _______________________________________________
> >> Amps mailing list
> >> Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> > ---
> > This email has been checked for viruses by AVG.
> > http://www.avg.com
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Tue, 5 Dec 2017 06:44:04 -0800
> > From: "Jim Thomson" <jim.thom@telus.net>
> > To: "Shon Edwards" <sre.1966@gmail.com>, "Amplifier Reflector"
> >    <amps@contesting.com>
> > Subject: Re: [Amps] MFJ products
> > Message-ID: <3BCC83556CB544E89AB5412DECE378FF@JimPC>
> > Content-Type: text/plain;    charset="UTF-8"
> >
> > ##  You forgot to tell us that it was a 40 A   13.8 vdc, switching
type
> power supply !
> > Found it on U tube, where the vdc pegged past 16 vdc.  Another
fellow
> had his
> > way over 45 vdc...and fried his yaesu.    The u tube fellow says his
> did not have
> > any over voltage protection built into it !   Since his was under
> warranty, MFJ will
> > repair it..... but not the very expensive yaesu xcvr.
> >
> > ##  Fuses on radios  will only protect against excess current, not
> excess voltage.   Your
> > surge protector on the input of the 120 vac.. feeding the MFJ
switching
> supply, will  not help at all.
> > The issue is the lack of over voltage protection in the mfj
switching
> supply, and what ever caused
> > it to crank out excess  vdc in the 1st place... frying everything
> connected to it.
> >
> > ##  Either   replace with a better quality switcher from a different
> manufacturer, or  use
> > an analog supply, like a  50 A  CCS astron.
> >
> > ##  way too many issues with the MFJ-4245  switcher imo.  if the
supply
> bows up, who cares... but when the
> > same supply  blows up  a bunch of expensive gear connected to it,
then
> its a serious issue.
> >
> > Jim   VE7RF
> >
> >
> >
> >
> >
> > From: Shon Edwards
> > Sent: Sunday, December 03, 2017 8:42 PM
> > To: Jim Thomson ; Amplifier Reflector
> > Subject: Re: [Amps] MFJ products
> >
> > I know this isn't really an amp question, but I checked my email for
> mfj-4245mv and found this one.  Last week, the current just took off.
> Fried a couple radios whose fuses didn't work.  Also my surge
protector
> didn't stop it from frying my radios.  Any idea what caused this or
how to
> fix it?
> >
> > Thanks!
> >
> > de Shon, K6QT
> >
> > Shon R. Edwards, MA, AG (Czech Republic)
> >
> > Amateur call:  K6QT
> > 1039 N 2575 W
> > Layton, UT, 84041-7709
> > USA
> > Home phone:  (801) 444-3445
> > E-mail:  sre.1966@gmail.com
> >
> >
> > or
> >
> > Shon Edwards
> > 715 Strawberry Creek Private Rd.
> > Bedford, WY 83112
> > Cell:  (307) 248-2104
> >
> > On Tue, Sep 11, 2012 at 8:22 AM, Jim Thomson <jim.thom@telus.net>
wrote:
> >
> >  Date: Tue, 11 Sep 2012 10:26:27 +0200
> >  From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
> >
> >  Subject: Re: [Amps] MFJ products
> >
> >
> >  My 5 cents worth:
> >  I own and use several pieces of MFJ equipment, much of it has been
in
> >  daily use for more than 10years:
> >  a MFJ-4245MV SMPS, no RF-hash, and has performed nearly 24/ 7 for
> >  more than 10years
> >  a MFJ-259B antenna analyzer, without a doubt the most useful tool
> >  in my toolbox
> >  I know there are better/more accurate/higher quality analyzers
> >  available now - at vastly higher prices!
> >  this one has been in use for more than 10 years in my shack and
> >  in the field, and when I broke it
> >  (my own fault - reverse polarity) MFJ was very helpful with
> >  repair suggestions
> >  I owned a MFJ-969 tuner for several years - did exactly what it was
> >  supposed to do at a very reasonable price
> >  Various power meters an dummy loads - again they have been
> >  performing exactly as expected.
> >
> >  To conclude: yes corners have been cut here and there, but at the
prices
> >  asked you get fair usefulness and many times equipment which few of
us
> >  could afford without MFJ supplying it.
> >
> >  --
> >  Vy 73 de OZ1PIF/5Q2M, Peter
> >
> >  ##  You obviously have not tried one of their SS HF linear
amps..like
> the
> >  AL-600  or AL-1300.   I defy anybody to get one to run full bore
for 5
> years
> >  straight.
> >
> >  Jim  VE7RF.
> >
> >
> >  _______________________________________________
> >  Amps mailing list
> >  Amps@contesting.com
> >  http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Tue, 5 Dec 2017 09:49:53 -0500
> > From: John Bodine <john.bodine@gmail.com>
> > To: amps@contesting.com
> > Subject: Re: [Amps] MFJ products
> > Message-ID:
> >    <CAFJ4jdbxR9TzoR+cKKXLUX7nuq-
d9sPnQBF6CKKe1zx_xWWTvA@mail.gmail.com>
> > Content-Type: text/plain; charset="UTF-8"
> >
> > Long ago I removed all adjustable voltage supplies from the shack
> because a
> > bump or a grandchild can break your heart(cook your transceiver).
> >
> >> On Tue, Dec 5, 2017 at 9:44 AM, Jim Thomson <jim.thom@telus.net>
wrote:
> >>
> >> ##  You forgot to tell us that it was a 40 A 13.8 vdc, switching
type
> >> power supply !
> >> Found it on U tube, where the vdc pegged past 16 vdc.  Another
fellow
> had
> >> his
> >> way over 45 vdc...and fried his yaesu.    The u tube fellow says
his
> did
> >> not have
> >> any over voltage protection built into it ! Since his was under
> >> warranty, MFJ will
> >> repair it..... but not the very expensive yaesu xcvr.
> >>
> >> ##  Fuses on radios  will only protect against excess current, not
> excess
> >> voltage.   Your
> >> surge protector on the input of the 120 vac.. feeding the MFJ
switching
> >> supply, will  not help at all.
> >> The issue is the lack of over voltage protection in the mfj
switching
> >> supply, and what ever caused
> >> it to crank out excess  vdc in the 1st place... frying everything
> >> connected to it.
> >>
> >> ##  Either   replace with a better quality switcher from a
different
> >> manufacturer, or  use
> >> an analog supply, like a  50 A  CCS astron.
> >>
> >> ##  way too many issues with the MFJ-4245 switcher imo.  if the
supply
> >> bows up, who cares... but when the
> >> same supply  blows up  a bunch of expensive gear connected to it,
then
> its
> >> a serious issue.
> >>
> >> Jim   VE7RF
> >>
> >>
> >>
> >>
> >>
> >> From: Shon Edwards
> >> Sent: Sunday, December 03, 2017 8:42 PM
> >> To: Jim Thomson ; Amplifier Reflector
> >> Subject: Re: [Amps] MFJ products
> >>
> >> I know this isn't really an amp question, but I checked my email
for
> >> mfj-4245mv and found this one.  Last week, the current just took
off.
> >> Fried a couple radios whose fuses didn't work. Also my surge
protector
> >> didn't stop it from frying my radios.  Any idea what caused this or
how
> to
> >> fix it?
> >>
> >> Thanks!
> >>
> >> de Shon, K6QT
> >>
> >> Shon R. Edwards, MA, AG (Czech Republic)
> >>
> >> Amateur call:  K6QT
> >> 1039 N 2575 W
> >> Layton, UT, 84041-7709
> >> USA
> >> Home phone:  (801) 444-3445
> >> E-mail:  sre.1966@gmail.com
> >>
> >>
> >> or
> >>
> >> Shon Edwards
> >> 715 Strawberry Creek Private Rd.
> >> Bedford, WY 83112
> >> Cell:  (307) 248-2104
> >>
> >> On Tue, Sep 11, 2012 at 8:22 AM, Jim Thomson <jim.thom@telus.net>
> wrote:
> >>
> >>  Date: Tue, 11 Sep 2012 10:26:27 +0200
> >>  From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
> >>
> >>  Subject: Re: [Amps] MFJ products
> >>
> >>
> >>  My 5 cents worth:
> >>  I own and use several pieces of MFJ equipment, much of it has been
in
> >>  daily use for more than 10years:
> >>  a MFJ-4245MV SMPS, no RF-hash, and has performed nearly 24/ 7 for
> >>  more than 10years
> >>  a MFJ-259B antenna analyzer, without a doubt the most useful tool
> >>  in my toolbox
> >>  I know there are better/more accurate/higher quality analyzers
> >>  available now - at vastly higher prices!
> >>  this one has been in use for more than 10 years in my shack and
> >>  in the field, and when I broke it
> >>  (my own fault - reverse polarity) MFJ was very helpful with
> >>  repair suggestions
> >>  I owned a MFJ-969 tuner for several years - did exactly what it
was
> >>  supposed to do at a very reasonable price
> >>  Various power meters an dummy loads - again they have been
> >>  performing exactly as expected.
> >>
> >>  To conclude: yes corners have been cut here and there, but at the
> prices
> >>  asked you get fair usefulness and many times equipment which few
of us
> >>  could afford without MFJ supplying it.
> >>
> >>  --
> >>  Vy 73 de OZ1PIF/5Q2M, Peter
> >>
> >>  ##  You obviously have not tried one of their SS HF linear
amps..like
> the
> >>  AL-600  or AL-1300.   I defy anybody to get one to run full bore
for 5
> >> years
> >>  straight.
> >>
> >>  Jim  VE7RF.
> >>
> >>
> >>  _______________________________________________
> >>  Amps mailing list
> >>  Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >>
> >> _______________________________________________
> >> Amps mailing list
> >> Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >>
> >
> >
> >
> > --
> >
> > Later,
> >        John Bodine/WU2E
> >
> >
> > ------------------------------
> >
> > Message: 4
> > Date: Tue, 5 Dec 2017 08:03:12 -0700
> > From: Shon Edwards <sre.1966@gmail.com>
> > To: Jim Thomson <jim.thom@telus.net>, Amplifier Reflector
> >    <amps@contesting.com>
> > Subject: Re: [Amps] MFJ products
> > Message-ID:
> > <CAC3=1e-Degve6SV_XXb0tbM8V-tQstLw=JXtJb5KrdMcCu-
r=w@mail.gmail.com>
> > Content-Type: text/plain; charset="UTF-8"
> >
> > Thanks Jim and everyone else (and the sympathies). Sorry I
neglected to
> > give all the info.  Yes, it's a mystery to me why all happened just
as it
> > did.  No matter how low I switched the DC Adjust dial (9-15 V), it
just
> > pegged itself it seemed even a bit higher than the max.
> >
> > Shon R. Edwards, MA, AG (Czech Republic)
> > Amateur call:  K6QT
> > 1039 N 2575 W
> > Layton, UT, 84041-7709
> > USA
> > Home phone:  (801) 444-3445
> > E-mail:  sre.1966@gmail.com
> >
> > or
> >
> > Shon Edwards
> > 715 Strawberry Creek Private Rd.
> > Bedford, WY 83112
> > Cell:  (307) 248-2104
> >
> >> On Tue, Dec 5, 2017 at 7:44 AM, Jim Thomson <jim.thom@telus.net>
wrote:
> >>
> >> ##  You forgot to tell us that it was a 40 A 13.8 vdc, switching
type
> >> power supply !
> >> Found it on U tube, where the vdc pegged past 16 vdc.  Another
fellow
> had
> >> his
> >> way over 45 vdc...and fried his yaesu.    The u tube fellow says
his
> did
> >> not have
> >> any over voltage protection built into it ! Since his was under
> >> warranty, MFJ will
> >> repair it..... but not the very expensive yaesu xcvr.
> >>
> >> ##  Fuses on radios  will only protect against excess current, not
> excess
> >> voltage.   Your
> >> surge protector on the input of the 120 vac.. feeding the MFJ
switching
> >> supply, will  not help at all.
> >> The issue is the lack of over voltage protection in the mfj
switching
> >> supply, and what ever caused
> >> it to crank out excess  vdc in the 1st place... frying everything
> >> connected to it.
> >>
> >> ##  Either   replace with a better quality switcher from a
different
> >> manufacturer, or  use
> >> an analog supply, like a  50 A  CCS astron.
> >>
> >> ##  way too many issues with the MFJ-4245 switcher imo.  if the
supply
> >> bows up, who cares... but when the
> >> same supply  blows up  a bunch of expensive gear connected to it,
then
> its
> >> a serious issue.
> >>
> >> Jim   VE7RF
> >>
> >>
> >>
> >>
> >> *From:* Shon Edwards
> >> *Sent:* Sunday, December 03, 2017 8:42 PM
> >> *To:* Jim Thomson ; Amplifier Reflector
> >> *Subject:* Re: [Amps] MFJ products
> >>
> >> I know this isn't really an amp question, but I checked my email
for
> >> mfj-4245mv and found this one.  Last week, the current just took
off.
> >> Fried a couple radios whose fuses didn't work. Also my surge
protector
> >> didn't stop it from frying my radios.  Any idea what caused this or
how
> to
> >> fix it?
> >>
> >> Thanks!
> >>
> >> de Shon, K6QT
> >>
> >> Shon R. Edwards, MA, AG (Czech Republic)
> >> Amateur call:  K6QT
> >> 1039 N 2575 W
> >> <https://maps.google.com/?q=1039+N+2575+W+Layton,+UT,+%0D+
> 84041&entry=gmail&source=g>
> >> Layton, UT, 84041-7709
> >> USA
> >> Home phone:  (801) 444-3445
> >> E-mail:  sre.1966@gmail.com
> >>
> >> or
> >>
> >> Shon Edwards
> >> 715 Strawberry Creek Private Rd.
> >> <https://maps.google.com/?q=715+Strawberry+Creek+Private+
> Rd.%0D+Bedford,+WY+83112&entry=gmail&source=g>
> >> Bedford, WY 83112
> >> <https://maps.google.com/?q=715+Strawberry+Creek+Private+
> Rd.%0D+Bedford,+WY+83112&entry=gmail&source=g>
> >> Cell:  (307) 248-2104
> >>
> >>> On Tue, Sep 11, 2012 at 8:22 AM, Jim Thomson <jim.thom@telus.net>
> wrote:
> >>>
> >>> Date: Tue, 11 Sep 2012 10:26:27 +0200
> >>> From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
> >>>
> >>> Subject: Re: [Amps] MFJ products
> >>>
> >>>
> >>> My 5 cents worth:
> >>> I own and use several pieces of MFJ equipment, much of it has been
in
> >>> daily use for more than 10years:
> >>> a MFJ-4245MV SMPS, no RF-hash, and has performed nearly 24/ 7 for
> >>> more than 10years
> >>> a MFJ-259B antenna analyzer, without a doubt the most useful tool
> >>> in my toolbox
> >>> I know there are better/more accurate/higher quality analyzers
> >>> available now - at vastly higher prices!
> >>> this one has been in use for more than 10 years in my shack and
> >>> in the field, and when I broke it
> >>> (my own fault - reverse polarity) MFJ was very helpful with
> >>> repair suggestions
> >>> I owned a MFJ-969 tuner for several years - did exactly what it
was
> >>> supposed to do at a very reasonable price
> >>> Various power meters an dummy loads - again they have been
> >>> performing exactly as expected.
> >>>
> >>> To conclude: yes corners have been cut here and there, but at the
> prices
> >>> asked you get fair usefulness and many times equipment which few
of us
> >>> could afford without MFJ supplying it.
> >>>
> >>> --
> >>> Vy 73 de OZ1PIF/5Q2M, Peter
> >>>
> >>> ##  You obviously have not tried one of their SS HF linear
amps..like
> the
> >>> AL-600  or AL-1300.   I defy anybody to get one to run full bore
for 5
> >>> years
> >>> straight.
> >>>
> >>> Jim  VE7RF.
> >>>
> >>> _______________________________________________
> >>> Amps mailing list
> >>> Amps@contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/amps
> >>>
> >>
> >>
> >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> > ------------------------------
> >
> > End of Amps Digest, Vol 180, Issue 6
> > ************************************
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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_______________________________________________
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http://lists.contesting.com/mailman/listinfo/amps

_______________________________________________
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http://lists.contesting.com/mailman/listinfo/amps


--
Roger (K8RI)


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