• 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.

Maestro soya amplificador

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Described as - 'S>Soya 811A Direct coupling Amplifier' (cct. attached) I built this after finding a pair of TZ40 valves. I used a 15K output transformer to suit. It worked well, but insufficient gain for my needs. I then tried the '811 SE Positive grid Amp.' (as attached) with much better results (with & without feedback). Anyone else played with these configurations?

Hope the attachments are visible!?

Any observations welcome,

David.
 

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