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Old 11-16-2012, 09:49 PM   #1
JKHC
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Amp Hum

My Egnater Rebel started humming when I turned it on yesterday, even without a lead plugged in. I tested different cables/cabs and concluded the problem lies in the amp. I swapped out the preamp tubes and that didn't do anything.

Help pwease?

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Old 11-16-2012, 09:54 PM   #2
Roc8995
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Does the humming change when you turn any of the knobs on the amp?

Any of the power tubes obviously blown?
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Old 11-16-2012, 10:07 PM   #3
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Quote:
Originally Posted by Roc8995
Does the humming change when you turn any of the knobs on the amp?

Any of the power tubes obviously blown?


The humming is unaffected by volume, gain or EQ knobs but is affected by the tube mix knob (which also affects wattage).

The power tubes don't look blown.
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Originally Posted by FEngHLyan
She will join the prom.

She insists to wear this lights.

I don't think so.

How can I persuade her?
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Old 11-16-2012, 10:11 PM   #4
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It could be a dud filter cap. The mix knob pretty much eliminates it being a power tube. Could just be the solder connection to a filter cap, the caps themselves may be ok. I'd start by resoldering all the joints in the power supply.

PS. Don't forget to discharge the caps first. It may have a discharge resistor built in but I wouldn't take a chance, especially seeing as how it could be involved in the fault.
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Old 11-16-2012, 10:18 PM   #5
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So...uh......I'll take it to GC and have them do it because I didn't understand a thing you said and can't be bothered.

Will it damage the amp if I continue to play it, because I have a potential jam coming up?
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Originally Posted by FEngHLyan
She will join the prom.

She insists to wear this lights.

I don't think so.

How can I persuade her?
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Old 11-16-2012, 10:24 PM   #6
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Probably not but it is possible. If the cap goes short circuit it will overload the power transformer and/or the rectifier. It will probably just blow the fuse though. If I were you I'd go hire another amp while you are getting it fixed. This is why smart people own a backup amp.
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Randall RM100
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Old 11-16-2012, 10:53 PM   #7
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GC isn't going to have a clue what to do with this. If it's under warranty, send it back. If it's not, get it to an independent tech. GC doesn't do competent amp repair, and most don't do it at all.
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Old 11-17-2012, 12:56 AM   #8
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Quote:
Originally Posted by Cathbard
Probably not but it is possible. If the cap goes short circuit it will overload the power transformer and/or the rectifier. It will probably just blow the fuse though. If I were you I'd go hire another amp while you are getting it fixed. This is why smart people own a backup amp.


I'll probably take my mustang. As much as I'd like to hire an amp it's a waste of money for my purposes.

And Roc, I've already contacted Egnater. Thanks for reminding me about the warranty. I hardly buy new so I forgot about it
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Originally Posted by FEngHLyan
She will join the prom.

She insists to wear this lights.

I don't think so.

How can I persuade her?
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