Loss of volume

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by althrax, Jun 21, 2004.

  1. althrax

    althrax Member

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    I have a 1959 Gibson GA 8 1-12. When I turn the volume past 5 there is a noticeable volume drop, and no change in volume from 5 to 9. When I put it to 10 it's real fuzz box type sounding. Any idea's on what the problem might be?
     
  2. somedude

    somedude Member

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    I'm assuming it's a tube amp (I don't know Gibson amps so....).

    Sounds to me like your tubes are distorting. They're supposed to do that.

    ;)
     
  3. althrax

    althrax Member

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    Tubes are fine. Replaced the 2 6v6 tubes and the 12ax7 tube. Still had no increase in volume after 5 on the dial. I don't think that's how a tube amp is supposed to work.


    PS. Your technical knowledge is astounding.
     
  4. Swarty

    Swarty Member

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    Sounds OK to me. I've owned a bunch of '50s Gibsons and they are just as you describe. I wouldn't call it "fuzz", but it is pretty heavy overdrive at 10. Some of my older Marshalls have have all their volume at 3, and from their up it just gets greasier. Lower output pickups will give you a bit more range before clipping.
     
  5. somedude

    somedude Member

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    We're talking tube overdrive here, I don't really see a need to get technical.

    My volume tops out at about 4 or 5 (depending on the channel). After that it's overdriving the power tubes harder, but not really getting any louder, at 10 it's distorting the hell out of my power section.

    If it's loud cleans you want, you'll need an amp with more clean headroom (the amount of clean volume you can achieve before tube breakup). The nice thing about 50w amps is that they break up at lower volumes. A 100w amp will give you a ton more clean headroom. You could also try using a lower output pickup, rolling off the guitar's volume, installing a pair of KT88 power tubes (if there's room), or micing the amp and listening through a loud monitor or in-ear monitor.
     
  6. Swarty

    Swarty Member

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    Don't put KT88s in the amp as your power transformer will not be up to to the task of supplying 3x the filament current of a 6V6.

    Either enjoy what many guys buy pedals to emulate or get a bigger amp.
     

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