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Tube amp problem

Discussion in 'Backline' started by AceFireForce117, Feb 15, 2014.

  1. AceFireForce117

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    Hi everyone !

    Yesterday, after recording one of my band's guitar players, i decided to play a bit before turning the amp off.
    Turn the standby on and suddenly there's this loud low squeal. Did a couple of tests and i've nailed it down to the lead gain. I've noticed when i turn the gain up the squeal's pitch goes higher, while turning it down makes a lower pitch squeal. I've never encountered this kind of problem so i'm guessing the cause is the tube pre for the lead gain ? I'm not sure. Has anyone had this problem before ?

    The amp is a engl ritchie blackmore signature 100 head.
    Can't continue recording and i need it working now :mad:
     
  2. ProphetofHatred

    ProphetofHatred We boogie on the floor

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    The tubes are failing
     
  3. AceFireForce117

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    The power tubes ? god damn it...
    Just what i needed right now
     
  4. bryan_kilco

    bryan_kilco Member

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    Sounds like microphone tube(s) maybe? Like a feedback type noise?

    You tracking the live amp?! If so, you may have problems getting the same tone again.
     
  5. AceFireForce117

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    Yeah it sounds pretty much like it..
    And yeah i'm gonna have to fiddle with it once it's up and running again to get a matching sound. I'm not that worried, it's for a debut ep but still...
     
  6. TheWinterSnow

    TheWinterSnow Den Mørke Natt

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    I want to put money on that it is a preamp tube. Its rare for power tubes to go microphonic like that as they have so little voltage gain to begin with. I have had some weird harmonic screeching coming from the phase inverter tube having oxidation on the socket, moving it around and in and out a few times fixes it, but a good oxidizing spray would do even better.
     
  7. AceFireForce117

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    that's why i thought about a preamp tube. If that's the case, then the question is which one ? and also how the hell can i access the preamp tubes, idk if you've ever owned a engl e650 but you can't take off the front panel and from the rear panel the power tubes block the way ! :heh:

    I'll mess around with it tonight when i have more time, see what happens when i change the pre's
     
  8. Fredrik-Ablaze

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    Microphonic tubes, ive owned 6-7 different engl amps and they have all had problems with microphonic preamp tubes.
    The stock tubes are simply not that good
     
  9. TheEngarn

    TheEngarn New Metal Member

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    Tubes. Don't risk the power transformers. Change them for safety.
     

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