• 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.

Reading material

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I'm not certain what an external supervisor does. I'm not an academic (furthest I got was postdoc), and audio is just a hobby. My PhD was in radio, and I have never built (or even thought seriously about) a mic preamp. However, I probably know a bit more about valves than most modern academics (which is quite easy, as they generally know almost nothing!).

Send me a PM if you want to explore this further.
 
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