[Amps] Grounded Screen 4CX1500B

[Ian White G/GM3SEK]

R. Measures wrote:
>
>The 30S-1 is cathode-driven because  no signal applied between the grid 
>and the cathode.
>
It is cathode-driven because the RF input is connected to the cathode - 
and nothing else (still looking at the schematic here).

>> I could never see how a 4CX1000A could function well in a
>> grounded grid mode.
>
>The screen grid is grounded

Yes...

>and the control grid is at the same signal potential as the cathode.

The control grid and cathode are not connected in the 30S-1.

G1 is essentially bypassed to ground. It receives a small fraction of 
the *anode* voltage as negative feedback, but it isn't connected to the 
cathode at all.


-- 
73 from Ian G/GM3SEK
http://www.ifwtech.co.uk/g3sek