• 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.

The 6N13S "Artosalo" OTL headphone amplifier

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No problem for these tubes as you need not much power here. Less then 1 Watt (more will blow your ears off your head). So if you do not care of bad efficiency then you should just build it.
 

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