• 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.

PSE schematic

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I have 4 KT88 tubes and some new SED Svetlana 12AX7 laying around, and I'd like to use them...
So I drawn a schematic, a KT88 PSE (I have 4 KT88, and why not to use them?)
Questions:

1. Can the paralleled 12AX7 tubes drive the KT88 in the right way? THe LTP current (sum) is of about 2mA.

2. Does it worth the try to use two paralleled KT88 as output tubes?

3. I already have a -15V for the long LTP, so why do not use it as the bias voltage? It should works better than bias the tubes via the cathode resistors, isn't it?

3.pdf

I've used a LTP as a differential amplifier for the global feedback (as usually done in SS amplifiers), and added some sort of LF from the plate of the output tubes...

Your opinion?

Ciao,
Giovanni
 
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