I forgot I have also converted this to 3 prongs plug and used the polarity switch for the power switch as it had a single metal switch for the power switch put in with a branding iron I think. I have ordered the replacement bulb and am thinking of putting a 120v neon behind a blue plastic face for the polarity. It looks like all this drama happened because the reverb tank holders wore out and broke and it landed on the power outputs. Ka Boom