Chassis number 2475-130, Music Man HD-130. The Vibrato Channel is getting weak and I believe it is the power tube going bad.

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Try adjusting the internal trim pot to adjust the intensity of the tremolo circuit. It is possible there is a defective Op Amp. (LM307H)
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Published in Pre-Ernie Ball Music Man Amps
More in this category: « Can you tell me if there are any authorized service centers that will still work on the old Music Man amplifiers? I am the proud owner of a 70s Music Man HD-130, chassis # 2475-130. I'd like to replace the tubes and bias the amp myself, but I don't know much about the amp except it has 4 x EL-34s. »
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