• 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.

Using rectifier tubes in parallell

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Yes, you can parallel them if you're careful about the cathode connection. There's conflicting advice from reliable sources about whether it's better to parallel a pair of plates in one tube or to pair plates from the two different tubes- that means both connection possibilities will work fine.
 
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