Recent content by legend58

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    JCM 900 tube replacement

    I have a JCM 900.  Great amp.  When I first got it I put it on my bench and noticed it had some cross-over distortion.  That occurs when the bias voltage is too high (actually too low because it is a negative voltage).  It's purpose is to keep the tube pretty much turned off until driven...
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    Mesa Boogie Mark IIB modification

    Does anyone have a procedure to modify a Mark IIB amplifer to use EL34 tubes rather than 6L6?
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