How do I tell if my caps are bad?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Igneous, Jun 18, 2005.


  1. Igneous

    Igneous Supporting Member

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    And, where can I get some online? as well as resistors and stuff?
    Thanks for your time-Ig
     
  2. pfrischmann

    pfrischmann Member

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    If you are talking about electrolytics, look for leaks or bubbles, especially on top of the blue LCR/DALY filter caps.

    If you hear lot's of hum......

    How old is the amp? What kind of amp?
     
  3. Igneous

    Igneous Supporting Member

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    its a laney aor pro 100.

    The caps look fine. I had to solder a new resisitor(1k) in to replace a burned out one(from the looks of it.) It seems to have affected the pull switch on the preamp. It sounds great tonewise when overdriven, however, when I play clean, it gets some bad distortion.


    How do I go about going through the signal path to see if its healthy? The bias seems to be fine. But thats all I could do.


    Thanks for your time-Ig
     
  4. Igneous

    Igneous Supporting Member

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    Sorry. It was made in 1987.
     
  5. Blue Strat

    Blue Strat Member

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    For electrolytics, if they're over 15 years old replace them. I've worked on tons of amps with bad caps that showed NO visible indications of being bad.
     
  6. SuperSoundMusic

    SuperSoundMusic Member

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    A fail safe way to tell they are bad is when they smoke so bad you think your house is on fire. I love it when that happens.
     
  7. unclej54

    unclej54 Guest

    well, that's kinda fun but getting into a hurry and wiring one backwards and sending flaming schrapnel all over your work bench..now that's fun..kinda like a cheap fourth of july show.:D
     
  8. Blue Strat

    Blue Strat Member

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    Yeah, and a side benefit is that your power tubes and/or one of your transformers get destroyed at the same time.:dude
     
  9. Igneous

    Igneous Supporting Member

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    So, the caps look alright, however, I plan I getting some new ones.

    Im trying to hunt down what might be wrong with the amp. Its somewhere in the preamp one section. The low input seems to work fine but no distortion. Might sound good with a tube screamer or something.

    Blue strat: Any experience with these heads?
     

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