Amp crackles when strummed: preamp or power tube issue?

Discussion in 'Amps and Cabs' started by wrxplayer, Feb 19, 2012.

  1. wrxplayer

    wrxplayer Supporting Member

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    My Aiken's crackling a bit when strummed. If it's a tube issue, which tube/s are most likely the culprit?
     
  2. keithb7

    keithb7 Supporting Member

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    My guess is it could be a grounding issue?
     
  3. Crowder

    Crowder Dang Twangler Silver Supporting Member

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    Does it have the TRS effects loop? If so, some corrosion and/or static electricity can build up inside there and cause a tiny short, which can cause the crackling sound. It's easy to fix. Just get some electronic contact cleaner and spray it in the effects loop jack. You can sometimes clear it by inserting a mono 1/4" plug into the effects loop jack. IIRC this creates a solid connection between the parts of the jack where the static can build up.

    If all else fails call Randall, he will get you fixed up.
     
  4. sled

    sled Member

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    Does it only crackle after it warmed up?

    Does it sizzle?

    Reseat all tubes

    Exercise the input jacks and loop jacks
     
  5. megatonic

    megatonic Member

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    How loud/faint is it?

    A long shot could be that your pickups are picking up a crackle, caused by static charge/discharge from your hand rubbing our pickguard. Try moving your strumming hand the same way you do when you strum, only don't play the strings. See if you hear the sound trough your amp. (make sure your guitar volume is up).
     
  6. John Thigpen

    John Thigpen Member

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  7. gixxerrock

    gixxerrock Member

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    If amp has an effects loop, plug in to the effects return and strum. This will bypass a bunch of preamp tube and tell you if the problem is in the front half of the amp.
     
  8. KWCabs

    KWCabs Member

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    Could also be your tube sockets.
     
  9. Guitar Dave T

    Guitar Dave T Member

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    Could be anything, even a loose screw on a transformer causing a grounding issue.

    But try the power tubes first, then preamp tubes. They're the easiest thing to diagnose and fix, and probably 90% of amp problems are caused by tubes.
     
  10. Lublin

    Lublin Senior Member

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    Sounds just like a bad tube. Swap all and keep in playing.
     
  11. XmasTree

    XmasTree Member

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    my V22 does this on the clean clannel
    ...in fact, everyone's V22 does this on the clean channel
    i'm pretty sure it's just the circuit not being able to handle a "hotter" signal
    ...it DOES NOT do this with single coils at all.
    (i have all good tubes)

    try using both single coil & humbuckers and see what it does....
     
  12. lang.murphy

    lang.murphy Member

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    Concur with "reseat all tubes" first. I had a loose rectifier cause noise issues, reseated it and all was good. If reseating doesn't fix it, time to swap tubes.
     

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