[Amps] Multi tube amp
Carl
km1h at jeremy.qozzy.com
Tue Dec 5 18:18:04 EST 2017
That reminds me of around 1957 when I dipped a toe into SSB with a used
Central Electronics 10B and a BC-458 VFO.The fleapower was boosted by a
article,CQ or QST, that was an amp that used a modified 1625 to drive 4
more, all in GG. The modification required cutting into the tube base and
unsoldering the Suppressor Grid wire from the cathode pin and stuffing it
into the grid or screen pin. RCA and a few other brand tubes could not be
modified since the suppressor connection was inside the tube envelope. I ran
this a few years on 75-40-20 until picking up a used HT-37 in 63 and a
CE-100V in 65 which I still use at times for great sounding phasing style
audio on SSB and AM
I think I still have those modified 1625's buried somewhere.
Other WW2 era tubes Ive used for up to 1500W are the 803 and 813.
A slightly more modern tube is the Russian GU-81M which is somewhat like a
pair of 813's on steroids. I havent used it at RF but a pair make a great AM
modulator for serious smoke
and cant fix this
Sorry for the screwed up formatting, hit the wrong key
.
Carl
----- Original Message -----
From: "KA9EGW" <ka9egw at ka9egw.com>
To: <amps at contesting.com>
Sent: Tuesday, December 05, 2017 4:32 PM
Subject: [Amps] Multi tube amp
> 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:
>>
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>> 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.
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>> _______________________________________________
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>>
>>
>>
>> ------------------------------
>>
>> 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
>> ************************************
>
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