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I'm getting a rather bizarre problem when I instal an Alesis Midiverb into the effects loop of my recently renovated Studio .22 combo. I'm getting a high pitched whistle and the signal becomes a bit garbled, almost like the input is being massively overloaded, although this is not the case. I've...

Tonejam. The circuit mods are to do with the uprating of R131 from 680? to 1K? and C9 from 470? to 3300? There are various references to the circuit diagram on the web. Cheers.

Hi everyone, my first post. I bought my Studio .22 new in 1985 from Chandler in Kew, London. It broke about twenty years ago, and I've just got round to fixing it. I've carried out the footswitch circuit mod and I'm now thinking of a full retube. If I use JJ tubes as replacements, do I need to...