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Problem with hum/buzz in amp

Discussion in 'Electronic Basics' started by [email protected], Nov 14, 2007.

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  1. Guest

    I have re-packed ready-made amp to new (prittier) case,
    and now, even when volume is down to zero - I am
    getting hum/buzz (not sure about terminology here).
    When turning volume up it gets proportionaly louder.

    How can I slove this problem ? Any tips / solutions
    will be greatly appreciated.

    Thank you in advance for any help offered.
  2. Guest

    Was it working correctly before you "prittied" (sic) it up? What was
    it before you started? Tubes? Transistors? Hand wired? PC board? Metal
    chassis? Plastic case?

    Need more info. Did you take any pictures before / after that you
    could post?

  3. Guest

    OK prettified, my bad (ENL) =)

    It was working fine before my "transplant" attempt. It was actually
    working very well, but enclosure was really butt-ugly. So, I got the
    idea to "do something" about that.

    This is kind of cheap, transistor, stereo amp. Four D2058 screwed
    to aluminium rail, 3A transformer in P/S block. I am quite clueless
    about analog stuffs. Metal enclosure, but I think I have tested it
    with open enclosure, and noise was not there back then. I have
    retained original wiring, no extensions, no replacements. Just fixed
    it into new case.

    I can not make any pictures right now. Is there anything else I can
    tell, to make it possible to find out what may be wrong ?

    I appreciate your help.
  4. Guest

    Sorry, a brain cramp. When I wrote about wiring, I failed to mention
    that I have extended all pots (vol/bas/tre/bal) - soldered out from
    and used CAT5 wire to conect them back from the front panel to PCB.
    Extension length 10-25 cm.
  5. Guest

    It's possible the metal chassis parts were part of the circuitry which
    you have inadvertantly disrupted. Examine all the mounts carefully to
    see if the original mounting hardware connected to any of the copper
    conductors on the PC board(s). Restoring the connections may cure it.

  6. Jamie

    Jamie Guest

    Fix the power supply.
  7. Jamie

    Jamie Guest

    Ok, now you know your problem.
  8. Tom Biasi

    Tom Biasi Guest

    I agree, if you brought the pots out with cat 5 you are just beging for hum.

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