2. amps-preamps
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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 !

tommypenngotti

Showing 5 responses by fiesta75

fiesta75
1,378 posts
 
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.
fiesta75
1,378 posts
 
OP, I thought you said you switched amps? tvad, think you nailed it.
fiesta75
1,378 posts
 
Oh, you switched channels not amplifiers. Output transformer is a possibility, but FAR less likely than a cap.
fiesta75
1,378 posts
 
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.
fiesta75
1,378 posts
 
I use a magnifying glass now. Also freeze spray is a good way to find a problematic component or at least section, good luck.
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