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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