[Amps] 572B grid

[Vic K2VCO]

Vic K2VCO wrote:
> kenw2dtc wrote:
>>  "I've never understood the raison d'etre for the introduction of the 572B. 
>> I gather it was meant as a cheap SSB tube"
>>
>> Perhaps this tech bulletin from 1964 will explain:
>>
>> http://w2dtc.com/1964-waters-tech-bulletin.jpg
> 
> This is very interesting, because it contradicts what I've believed: 
> that the 572B offers no additional power output over the 811A unless you 
> raise the plate voltage.  But this bulletin says that simply plugging 
> them into a 30L1 and increasing drive will increase power output by 33%. 
>   What's the truth here?

I take it back.  That's 33% *without* increasing drive.  It's 75% if you 
increase drive!
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco