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ampeg svt 6pro tube problems?

Discussion in 'Amps and Cabs [BG]' started by littleleaguedad, Nov 2, 2013.

  1. Hi gang, I just bought a used Ampeg SVT 6PRO from G.C.
    I received it about a week ago (a day after having a knee replaced). just got a chance to plug it in, and its making a sound like shaking an incandescent lightbulb (metallic SSSHHHHH coming through the cab. Anyone have an amp do this? This is my first amp with tubes :hyper:can it need a new tube set?
  2. Could need one. From the description sounds like a microphonic tube.
  3. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    In all likelihood, it's just one tube. Open it up, plug it in (being very careful not to touch anything inside, of course), and with a chopstick or butt end of a wooden spoon or any similar object made of wood and not metal, lightly tap each tube. You'll find the culprit.

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