• 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.

Battery filament for 4P1L

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mwiebe

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Joined 2004
Your battery idea is fine, don't worry too much if you don't hit the exact filament voltage of 4.2V. It's a great tube so the important part is getting started using it. I've used three 1.2V NiCads in series which works fine as well. If you like what you hear you can invest more time and money in a filament supply.
Matt
 
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