Neutralizing Death Cap on Vintage Tube Amp (Harmony H420) - Going 3-Wire With a Ground
Installing a 3-wire cable with ground wire requires that you eliminate the reverse polarity switching common on vintage amps. You also need to make sure to wire the incoming neutral wire to the side that connects the so-called "death cap" capacitor to the chassis. This is my continuing project to restore and update a Harmony H420 1960's tube amp.
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