[Amps] re; The maximum amount of 811As and 572Bs in parallel

[R L Measures]

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 at somis.org