• 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.

light up tubes without signal

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#21
Screenshot from 2020-07-19 14-06-13.png


There that's my take on it collector of NPN low = not mute. Could drive a relay or a blue LED.
 
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