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jmp-1 retube


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I have a jmp1..easy to re-tube..open it up and pull out the old tubes and push in (gently) the new ones...no bias needed...I tried various...EH's seemed ok but went microphonic in a month..JJ's where great, creamy with good sustain and I kept them for awhile..then I tried Groove Tube High gains and I have those still..mostly due to laziness..eventually I will go back to the JJ's.

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