Re: [Amps] 572B grid

[Vic K2VCO <vic@rakefet.com>]

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?
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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