Orange Rocker 30 hummmmmmmm

Discussion in 'Glowing Bottle Tube Amp Forum' started by KC, Dec 14, 2019.

  1. KC

    KC Friend of Leo's

    Mar 16, 2003
    Missoula, Montana
    Hey all, picked up a Rocker 30 last summer on the cheap, obviously rode hard and put up wet -- the power tubes were hanging by a thread when I got it. Dropped in a pair of JJ 6ca7s and it sounds terrific now -- but there's a hum at idle, not overpowering but constant, comes on as soon as the amp goes from standby to on. Not loud enough to be a problem in a band situation but definitely a problem for recording. Any thoughts on how to fix?
  2. Wally

    Wally Telefied Ad Free Member

    Mar 17, 2003
    Lubbock, TX
    Hum..possible problems....filter cap, tone cap, coupling cap, preamp tube, power tube imbalance——was the bias checked when the new tubes were put in, bad ground, bad potentiometer, bad solder connection. does the hum persist with all controls at zero?
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