Problem with hum/buzz in amp

snipped-for-privacy@gmail.com wrote: > 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. >

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?

GG

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.

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 PCB and used CAT5 wire to conect them back from the front panel to PCB. Extension length 10-25 cm.

On Nov 13, 10:33 pm, snipped-for-privacy@gmail.com wrote: > On Nov 14, 12:55 pm, snipped-for-privacy@yahoo.com wrote: >

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.

GG

Fix the power supply.

Ok, now you know your problem.

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

Tom