Manley Amp is humming - troubleshoot :(


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?

thanks !

128x128tommypenngotti
Oh, you switched channels not amplifiers. Output transformer is a possibility, but FAR less likely than a cap.
@rlb61 

best way to check?

pretty sure it's the amp , love to solve this w/o sending to Manley...
Are you good with a soldering iron? Look for any capacitors that are bulging or leaking. A thorough visual examination of all components and solder joints before doing anything.
You better have the necessary skills before going into that amp, you could make a bad situation worse.