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Topic: Reverb hums |
Tommy Boswell
From:
Virginia, USA
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Posted 2 Jun 2014 3:36 am |
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The reverb in my Peavey Special 112 likes to hum if I turn it too high. (I know, I know, it must have forgotten the words!) Could it be my cabinet causing the springs to vibrate? The cabinet is proper size for the amp and 12-inch speaker, but it is solid pine with dove-tail corners. Do I need to move the tank away from the speaker? Or let it rest on a bed of foam maybe?
Funny thing is once the humming starts, it continues even when I stop playing. Maybe I need a new reverb tank?
Any help appreciated. |
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Tommy Boswell
From:
Virginia, USA
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Posted 2 Jun 2014 4:05 am
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| One more clue: it's hard to re-create the problem playing at home. Could it be just when the amp is tilted back on the amp stand? (don't have a stand here to test). |
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Lane Gray
From:
Topeka, KS
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Posted 2 Jun 2014 6:05 am
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I wonder if the cardboard under the tank has gone missing or hard.
It sounds like you're onto something with the physical nature. Something has your springs oscillating.
I'd try replacing the cardboard.
Some makers screw the tanks to the case, isolating it with grommets
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Willie Sims
From:
PADUCAH, KY, USA
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Posted 3 Jun 2014 11:00 am
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| BE SHURE THE REVERB OUTPUT CONNECTOR IS NOT CLOSE TO THE POWER TRANSFORMER ; WILLIE SIMS. |
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Tommy Mc
From:
Middlesex VT
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Posted 13 Jun 2014 4:16 pm
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| Willy, I just want to thank you for the advice. I recently put a new reverb tank into my amp and was having the same problem. Simply reversing the direction it was mounted solved my problem. |
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George Kimery
From:
Limestone, TN, USA
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Posted 13 Jun 2014 8:08 pm Reverb hums
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| If you decide that the reverb is the problem, now would be a great time to upgrade to a Mod reverb. I just did so ($19.95) in my 112 and it is better built and sounds a whole lot better than the reverb that came in the amp. You will have to get the folks at Antique Electronic Supply to sell you the proper reverb to replace what you have. |
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David Nugent
From:
Gum Spring, Va.
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Posted 14 Jun 2014 4:11 am
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| Try rotating the plug 180 degrees (where the tank wires connect to the chassis). When I installed a new tank in my Nashville 112 it was noisy, reversing the connector solved the problem. |
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Tommy Boswell
From:
Virginia, USA
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Posted 14 Jun 2014 4:34 am
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| Willie Sims wrote: |
| BE SHURE THE REVERB OUTPUT CONNECTOR IS NOT CLOSE TO THE POWER TRANSFORMER ; WILLIE SIMS. |
Well that's interesting. I do have a large transformer (160 watt amp). Which brings up another question...the first time I noticed the problem my amp was directly in front of my PSG with single coil pickup. Could that be a factor? But turning off reverb stopped the hum. |
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Eric Dahlhoff
From:
Point Arena, California
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Posted 15 Jun 2014 4:02 pm connections
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I recently had a similar problem with reverb hum on a Fender. The metal case of the tank gets it's ground through the return jack. And the gnd connection of the jack (RCA) was dirty.
A few swipes with steel wool & 'twas all better.
_________________
"To live outside the law you must be honest." (Bob Dylan) |
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Tommy Boswell
From:
Virginia, USA
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Posted 15 Jun 2014 5:37 pm
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| Thanks Eric, I'll be sure to try that one. I've actually restored 3 old Peavey amps from almost dead with nothing but a good cleaning of the electrical contacts and a little work to re-tension the switching jacks. I guess I should have thought of that one myself. Thanks for sharing your experience. |
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