On Jul 23, 2006, at 6:28 PM, Hsu wrote:
>
>
>
> Hi,
> I just read the datasheet of 811A and 572B, I find that 811A
> and 572B only need
> no more than 10W drive power ,
In Class C grid-driven, yes. In Class AB2 cathode driven, they need
around 30W of drive each.
> drive 10*572Bs or 811As would be need no morthan
> 100W.Is the loss of in put match work will have too large?
> 73! Hsu
>>
>>>>> 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
>>>>>
>>>>>
>>>>>>
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R L MEASURES, AG6K. 805-386-3734
r@somis.org
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