kzoolou Posted June 10, 2014 Posted June 10, 2014 Does anyone have a recommendation for an amp tech in the SW Michigan area? I have an old Marshall JMP50 head with 6550's that I would like to have converted to EL34's. I'm sure it needs caps and such as well. I've had the thing for about 25 years and I've never changed any of that stuff.
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