[Amps] Multi tube amp
Gary Schafer
garyschafer at largeriver.net
Sun Dec 10 17:48:19 EST 2017
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 at contesting.com] On Behalf Of Herbert
> Schoenbohm
> Sent: Wednesday, December 06, 2017 7:08 AM
> To: KA9EGW; amps at 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 at 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 at contesting.com wrote:
> > >
> > > Send Amps mailing list submissions to
> > > amps at 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 at contesting.com
> > >
> > > You can reach the person managing the list at
> > > amps-owner at 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 at arrl.net>
> > > To: <amps at 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 at contesting.com] On Behalf Of Carl
> > > Sent: Monday, December 4, 2017 7:53 PM
> > > To: Fuqua, Bill L <wlfuqu00 at uky.edu>; amps at 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 at uky.edu>
> > > To: <amps at 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 at 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 at 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 at telus.net>
> > > To: "Shon Edwards" <sre.1966 at gmail.com>, "Amplifier Reflector"
> > > <amps at contesting.com>
> > > Subject: Re: [Amps] MFJ products
> > > Message-ID: <3BCC83556CB544E89AB5412DECE378FF at 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 at 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 at telus.net>
> wrote:
> > >
> > > Date: Tue, 11 Sep 2012 10:26:27 +0200
> > > From: "Peter Frenning [OZ1PIF]" <peter at 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 at 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 at gmail.com>
> > > To: amps at contesting.com
> > > Subject: Re: [Amps] MFJ products
> > > Message-ID:
> > > <CAFJ4jdbxR9TzoR+cKKXLUX7nuq-
> d9sPnQBF6CKKe1zx_xWWTvA at 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 at 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 at 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 at telus.net>
> > wrote:
> > >>
> > >> Date: Tue, 11 Sep 2012 10:26:27 +0200
> > >> From: "Peter Frenning [OZ1PIF]" <peter at 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 at contesting.com
> > >> http://lists.contesting.com/mailman/listinfo/amps
> > >>
> > >> _______________________________________________
> > >> Amps mailing list
> > >> Amps at 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 at gmail.com>
> > > To: Jim Thomson <jim.thom at telus.net>, Amplifier Reflector
> > > <amps at contesting.com>
> > > Subject: Re: [Amps] MFJ products
> > > Message-ID:
> > > <CAC3=1e-Degve6SV_XXb0tbM8V-tQstLw=JXtJb5KrdMcCu-
> r=w at 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 at 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 at 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 at 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 at telus.net>
> > wrote:
> > >>>
> > >>> Date: Tue, 11 Sep 2012 10:26:27 +0200
> > >>> From: "Peter Frenning [OZ1PIF]" <peter at 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 at contesting.com
> > >>> http://lists.contesting.com/mailman/listinfo/amps
> > >>>
> > >>
> > >>
> > >
> > >
> > > ------------------------------
> > >
> > > Subject: Digest Footer
> > >
> > > _______________________________________________
> > > Amps mailing list
> > > Amps at contesting.com
> > > http://lists.contesting.com/mailman/listinfo/amps
> > >
> > >
> > > ------------------------------
> > >
> > > End of Amps Digest, Vol 180, Issue 6
> > > ************************************
> >
> > _______________________________________________
> > Amps mailing list
> > Amps at contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> _______________________________________________
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