Amp volume fading in and out: any ideas?

Discussion in 'Amps and Cabs' started by MyTenToes, Feb 9, 2012.

  1. MyTenToes

    MyTenToes Member

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    Over the last couple of days my amps been playing up. Every now and again the volume will just fade out (not suddenly cut off) and then fade back in. It doesn't fully fade out, just to a lower volume, why might this happen?

    Cheers.
     
  2. brian.robert

    brian.robert Supporting Member

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    I had this happen, and was told to change the preamp tubes. I'm not expert, so I can't so how or why, but it fixed it
     
  3. Tonefree

    Tonefree Silver Supporting Member

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    Possibly the output transformer. I had a Marshall do this. It would be fine and then drop volume. as the coil wires got hot it would short. Good luck:bounce
     
  4. vibrostrat43

    vibrostrat43 Supporting Member

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    I don't believe your OT shouldn't get THAT hot, I think that's more a sign of another problem if the OT is getting that hot
     
  5. Gretsch&Vox

    Gretsch&Vox Member

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    Sounds like the power tubes to me.
     
  6. Tommy_G

    Tommy_G Member

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    Turn the Tremolo off..... ;)
     
  7. mikey

    mikey Member

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    Does it have an effects loop? Dirty jacks on a loop can cause this. Plug a jumper between the send and return and see if the problem goes away.
     
  8. Blue Strat

    Blue Strat Member

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    Are you plugging directly into the amp (no pedals)? If not, be sure to try that first.
     
  9. earthlydescent

    earthlydescent Senior Member

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    Lot of reasons...

    Transformer issues, preamp and power tubes loose, dirty jacks (not usual for slow fade outs)...

    See a tech. It'll solve a lot more headaches that way.
     
  10. Guinness Lad

    Guinness Lad Silver Supporting Member

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    Start with preamp tubes. I had this same thing happen, it was a "supposedly" good NOS 12ax7.
     
  11. Blue Strat

    Blue Strat Member

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    Tubes are almost never intermittent. Connections, like tube pins to tube sockets, are often intermittent. A tube making and losing contact would fade in and out. Clean all tube pins and sockets.
     
  12. MyTenToes

    MyTenToes Member

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    Thanks for the suggestions! I'll give them a go
     

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