Hello all ...I have been chasing a gremlin on the left side of my system for about a year . Last night my Left side was completely distorted at lower volume and after that just turned into loud humming....
Manley Snappers Manley Jumbo Shrimp Pre amp Klark Teknik DN360 EQ Source was Macbook Pro
So i switched the amps to see if the hum would follow the amp & it did ....even with everything off except amp... super loud low end hum ...like a grounding issue...changed all tubes 3 times , still hums ...any clues before I send it in?
Most common problems can be found by careful visual observation. Look at all of the electrolytic caps to see if there is any bulging (most evident at the caps on the end of the capacitor) or leaking. You can tell if they are bulging by comparing them visually with others. Look to see if any resistors look like they have heat damage (looks dark or singed). Sometimes a resistor will vaporize and simply not be there--you will see only the leads of the resistor left on the board or in the circuit.
If you are lucky, and a bit handy, you can replace parts yourself. As someone mentioned above, discharge capacitors before sticking anything conductive (particularly your fingers) into the amp. Anything more and you are best off sending it to a technician. The good thing about tube gear is that almost anything is repairable.
I assume it still hums with all inputs (sources) disconnected? If so, then I'd suspect a capacitor in the preamp and will need service. Unless you feel comfortable, I would have a professional tech look at it.
sent to Manley....apparently it was the Caps on the top of amp, replaced all 8 on both sides ...I'm hoping this quells the noisy issues...Jumbo Shrimp preamp still suspect though....pulled off the lid and moved the middle circuit board and it was Cracklin' Rosie once... 😕