Needing advice to stabilize a DC coupled CF with DC feedback.

Tech Square

Technical and speculative discussion of amps, cables and other topics.

Hello,
I posted this on Tube DIY but i always forget this is "Ze" technical forum. I hope the moderators will let this one slip in.
Let me say that i'm even newer to NFB and DC coupling than i am to CFs :O)
Does this circuit has any chance to work? The bias for the 2A3 is provided by a regulated -125V supply through Rload from the CF. Rfb provides DC feedback :
If the bias shifts toward zero, there is more current flowing through the 2A3, its plate voltage drops, meaning less current thru Rfb and Rload, reducing the drop in Rload which lowers the bias point and counteracts the bias shift so the op-point for the 2A3 is maintained around -50V.
The feedback ratio would be Rfb/Rload; i'll go somewhere between 10dB and 20dB. All this is theorical and it is my first design with NFB, so your suggestions are most welcome. Thanks for any help!
Joris in Quebec, where summer is now a souvenir

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Topic - Needing advice to stabilize a DC coupled CF with DC feedback. - SomeJoe 20:05:53 08/16/06 (1)

Re: Needing advice to stabilize a DC coupled CF with DC feedback. - beermanpete@socal.rr.com 20:20:50 09/09/06 (0)

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