I don't remember exactly how much if any bias voltage was put on the 
cathode in a grounded grid amp.  I do remember on 811s, the cathode was 
actually the filament, so they were fed filament voltage (around 5 v as 
I recall, through a double wound rf choke, I forget what those were 
called.  I just don't remember how the cathode was biased or if it was.
73
Butch Bussen
wa0vjr
open Node 3148
Las Vegas


On 
Mon, 16 Aug 2010, Pat Byrne wrote:

> Good point Butch.  There hadn't better be any - unless they changed
> the laws since you and I learned that theory!!
> Pat, K9JAUAt 05:00 PM 8/16/2010, you wrote:
>> I'm not sure what amps you are talking about, but aren't most amps that
>> run say 572s or 811s grounded grid? YOu drive the cathode, and the output
>> power is actually the power of the rig plus the amp.  Would you have grid
>> current in a grounded grid?  Maybe it has been to long since tube theory.
>> 73
>> Butch Bussen
>> wa0vjr
>> open Node 3148
>> Las Vegas
>
>