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.

6N3/6N6 headphone amp using PCB.

You can use the same 12V supply to run the DC DC boost and the heaters, but you'll want 12V/10A... 1.67A won't be even close to enough current.

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