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Post by graybeard65 on Jul 22, 2017 5:45:12 GMT -7
My Maz has recently developed a hum that I'm not overly fond of. I've got new tubes, full set, and have tried swapping them out one-by-one to rule out a tube issue...so I'm stumped.
Power on, standby off, and the hum is there. Rolled every knob off one at a time and all off, still there, unchanged. It's similar to a 60-cycle hum, but that's not it. Happens with any guitar I have, and no guitar at all. Changed cables, changed power source, I *think* I've ruled out the things that I have the ability to rule out.
Anything else I should try before having it looked at?
Thanks for any pointers!
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Post by purpletele on Jul 22, 2017 5:53:21 GMT -7
It has been my experience that a 60 cycle hum usually means there is a ground wire that that is loose or has a fractured solder joint.
If that is the case, then it could be a control wire or a component that is going to ground. If a component ground is fractured it really upsets the soul of the amp.
That's my take at 5:45 AM after a Sopranos binge and quality time with amps, lots of them.
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Post by Jaguarguy (Mike) on Jul 22, 2017 5:56:18 GMT -7
Also try to clean the effects loop with some Deoxit5 - spray some on one of your 1/4 plugs and work it in and out of the effects loop (and your inputs on front while you're at it.)
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Post by digs57 on Jul 22, 2017 6:56:32 GMT -7
Also try to clean the effects loop with some Deoxit5 - spray some on one of your 1/4 plugs and work it in and out of the effects loop and your inputs on front while you're at it. along with the pedal jack too...that was culprit along with low input...all good now
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Post by Jaguarguy (Mike) on Jul 22, 2017 7:25:23 GMT -7
Also make sure the chassis bolts are tight.
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Post by BritInvasion on Jul 22, 2017 7:33:09 GMT -7
Also make sure the chassis bolts are tight. Often overlooked and often the problem.
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Post by zpilot on Jul 22, 2017 8:33:38 GMT -7
Is it 60hz or 120hz? They indicate different things. As a reference a B played at the second fret of an A string is approximately 120hz and, of course a B an octave below would be 60hz.......if my memory is right.
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Post by graybeard65 on Jul 22, 2017 10:50:47 GMT -7
Is it 60hz or 120hz? They indicate different things. As a reference a B played at the second fret of an A string is approximately 120hz and, of course a B an octave below would be 60hz.......if my memory is right. I don't believe it's 60 or 120 cycle hum, but it's a similar sound. It's an older Maz, no loop, no pedal - but I'll tighten chassis bolts and make sure the input jacks are cleaned - thanks SO much for the pointers and feedback! It's not gonna kill me to live with it a minute, but there's a couple of great amp guys in the twin cities area, help is close if needed
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Post by purpletele on Jul 23, 2017 22:34:23 GMT -7
I bet it's one of the input jacks or control knobs.
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