Richard,
I see, too much tube means much drive.Myebe I can not use the cathode
drive.
I have seen a very old Chinese military 1600W HF transmitter(final is
FU-100F=4CX1000A)
the pre-driver are 8*6P15's(simlar 12BY7,but 6.3V filament) in parallel in"
transmisson line" mode.
Very rare mode.
73! Hsu
----- Original Message -----
From: "R L Measures" <r@somis.org>
To: "Hsu" <Jbenson@sohu.co>; "Hsu" <Jbenson@sohu.com>
Cc: <amps@contesting.com>
Sent: Sunday, July 23, 2006 9:57 PM
Subject: Re: [Amps] The maximum amount of 811As and 572Bs in parallel
>
> On Jul 23, 2006, at 4:05 AM, Hsu wrote:
>
>> Hi,
>> I have seen some schematic diagram of amplifier, I found that
>> the amount of 811As and 572Bs no more than four, Coud someone can
>> tell me how much maximum amount of the tubes in parallel?
>
> Tektronix used to use c. 10 tubes in their O'scopes' deflection plate
> amplifiers. The story about paralleling more tubes having too much C
> is a large pooper scooper of taurine feces because if the # of tubes
> is doubled, twice as much C in needed to keep the operating Q in the
> desired 10 - 15 range. If I had 300W of drive, I would not hesitate
> to build an amplifier with 10, 572Bs or 811As.
> cheers, Hsu
>
>
>> Thanks!
>> 73! Hsu
>> _______________________________________________
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>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
> R L MEASURES, AG6K. 805-386-3734
> r@somis.org
>
>
>
>
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