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AFAIK it's a polarity and grounding issue, so not as simple as just being a switch. Things done moved on from my day.
Those Ice Cubes work on any Fender reverb amp with RCA sockets at the back. My old band had red and blue ones, for Twins pre and post '78. I think they can be had for quite cheap, give it a go! Mine's still knocking about somewhere. I think we bought them out of the back of the Melody Maker!
RonAsheton
Why do amp switchers need to be active? Is it only for the pretty lights? Shirley, it's just a switch?