• 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.

Sphinx project 4 service/repair manual

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There is a version 1 and 2 but for study purposes does not matter.
Thanks for looking.
 

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These boards are not the same. Probably mine are older (much older). Anyway these are simple triode stage with a solid state buffer. The sound is a bit dull, that’s why i have the boards as the amp has been rebuild with a full tube version. I will check anyway what i can find for you.
 
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