HeHe RoryB, I was thinking of just leaving it and letting it disguise my voice a bit.

53, It's a transister amp, must have been one of the first, it's got a built in rhythm generator with a dozen or so ballroom dancing styles and one labelled "Teen Beat". So it's got to come from the real early days of Rock and Roll.

I'll try that WYSI. I've tried reversing the mains polarity but that didn't help. Surprisingly the pots are still fairly clean.