• 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.

Pre/headphone/amp, 3 in 1 spud, triode mode EL84-PHA

Here's a very simple but highly efficient application of the ubiquitous EL84/6BQ5/6P14P
 

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