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MM HD-130 snap crackle pop

Discussion in 'Amps and Cabs [BG]' started by ihixulu, Sep 20, 2004.


  1. ihixulu

    ihixulu Supporting Member

    Mar 31, 2000
    South Shore MA
    Hey all,

    I have a Musicman HD-130 which I cleaned up and brought back to life a couple of months ago with good results. New power tubes, biased, cleaned off years and years of gunk from the circuits.

    It's been performing well until about a week or so ago when I noticed that the output was more distorted and losing a lot of lowend oomph. I replaced the 12ax7a phase tube and it helped somewhat with the volume issue but there is still a LOT of hiss, popping and grunting noises coming from the amp when it's off standby.

    Does this mean a cap job is in order?

    Any help would be appreciated.