Amp noise like nothing I've ever heard...

Discussion in 'Amp Central Station' started by zbzarcone, May 31, 2018.

  1. zbzarcone

    zbzarcone NEW MEMBER!

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    Hey All, I recently purchased a used Supro Saturn 1648RT. Played fine in store and for like 2 weeks at home. Then it randomly started making this noise (see video below). Like a buzz that decays with the sustain of the notes. Most recently the volume had started to dip and then come back as well. It doesn't sound vibrational to me either and I can't find anything loose.

    I have replaced the power tubes and swapped out preamp tubes as well. (the ones that are accessible from the rear of the amp)

    I have plugged the amp into a different speaker as well. I have tried every guitar/cable/pedal/no pedal combo. Still it persists.

    It is important to note it comes and goes but doesn't seem related to the time at which i am playing (right after turning on, or when its been running for an hour +)

    I haven't opened up the chassis yet either.

    Thanks in advance for any help!

     
  2. AndreDanican

    AndreDanican Tele-Holic Gold Supporter

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    Does this amp have tremolo?
     
    TeleTucson likes this.
  3. Minivan Megafun

    Minivan Megafun Tele-Holic

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    Return it. Now.
     
    Wally and JD0x0 like this.
  4. JD0x0

    JD0x0 Poster Extraordinaire

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    Return it. I've seen a few of these have issues already.
     
  5. zbzarcone

    zbzarcone NEW MEMBER!

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    Yes it does.
     
  6. wanderin kind

    wanderin kind Tele-Meister

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    play a B flat on your low E string and bend it up slightly to see if the noise increases, if it does, that would mean a filter cap, (B flat close to 120 hz, pwr supply ripple is 120 hz, so they clash together)

    otherwise it sounds like an unstable amp creating oscillation which is superimposed on the guitar notes,
     
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