Roberto IZ5FCY wrote:

Hello to everybody.

I would want to use a pair or quad tetrode (4-400a or 4cx250/350) as GG
triode for AB/C class operations.

I don't remember where I have read that only the control grid had
physically push to ground, while the others grid(s) was electrically
floating and connected to ground through of the capacitors....

Can you help me with schemas, links and suggestions?

Many thanks in advance..and sorry for bandwidht...


Roberto IZ5FCY

AFAIK a tetrode in grounded grid doesn't give you much more (if any)
gain than a triode in grounded grid, but you still need all the special
care and feeding of the screen.

So why not just use triodes?

Better yet, why not use the tetrodes in common-cathode service, and get
1000 watts out for 1-10 watts in?

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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