• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Convert valve output stage to pre amp

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Good day all.

I had a long and slow project but manage to get it done 2 weeks ago. It is a I Tube Zator output stage (SRPP) using x2 6922. Somehow by now having a pre amp important then a output buffer because I may need it for my future turntable setup. Therefore I had converted to a pre amp by adding L pad (47k and 10k) before 20k V.pot then to the tube - Pin no.2.

Before that I had problems to find the closest match for V out from my CDP. I add on a 20k v pot before and after the buffer and all don't work well - the gain was overly high.

To my shallow understanding to build a correct, proper pre amp, I need more advise and recommendation what the best I can max out from this pre. My plan is maintaining the SRPP design with the B+ given. Any suggestion ie, changing cathode or anode value for betterment? signal input and output value? Or should I build a new amp that the gainclone don't suits well.As for the B+ is between 140vdc - 170vdc adjustable.

Your input is highly appreciate and hope I can made this conversion be a successful pre. Thanks all!>
 
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