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Topic: Noisy reverb on my Sho-Bud single channel amp ?? |
Jim Bates
From:
Alvin, Texas, USA
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Posted 16 Jul 2015 6:59 am |
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What is the correct reverb spring for this amp? As is, even at a '2 or 3' setting, the reverb makes this constant low level ringing, even without guitar plugged in. Any other thing I need to check if a new spring doesn't fix it?
Amp is great otherwise.
Thanx,
Jim |
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Lane Gray
From:
Topeka, KS
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Posted 16 Jul 2015 8:29 am
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A constant ring would, I suspect, indicate a bad tank.
What happens if you disconnect the return wire at the tank, and turn the reverb up?
_________________
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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Justin Griffith
From:
Taylor, Texas, USA
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Posted 24 Jul 2015 4:13 am
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If it still has the original Gibbs tank, try running a piece of duct tape across the top (with the springs facing down) of the reverb can.
Also make sure you have the cardboard and bag around the reverb tank.
Those amps are pretty finicky about reverb tanks. It is worth fixing though, as without their own reverb working, the highs get thin, and you loose a bunch of the mojo.
I'm not at my shop, but I can get you an Accutronics number if you need a new can. I cannot recommend the Mod brand reverb tanks highly enough. They cost less, and sound really good! You order them using the Accutronics number.
*Edit: I used the words tank and can. They mean the same thing. Just my usual butchering of the English language!
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Emmons/Sho~Bud/Blanton, Fender/Peavey.
Telonics pedal |
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Jim Bates
From:
Alvin, Texas, USA
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Posted 25 Jul 2015 10:45 am
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Thanks for the tips of finding and fixing (?) the problem.
My first amp with builtin-in reverb was a Cain amp head I bought from Maurice Anderson. When I dialed-in the reverb it was completely noise free, unless someone hit amp and got a 'crash'.
Thanx,
Jim |
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Jim Bates
From:
Alvin, Texas, USA
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Posted 2 Aug 2015 9:53 am
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I disconnected the return lead, and amp is quiet (no reverb
ringing).
The spring/can has no name on it, only the number "1122".
Also, the can is mounting (screwed directly) on to 1/4" piece of plywood, with NO isolation rubber washers on it.
I will remove the plywood and replace with cardboard, put a strip of duct tape on top (which may quiet any internal noises??), use some isolation rubber grommets to set on the cardboard, and put back in the sleeve.
Anything else to check before, changing out can?
Thanx,
Jim |
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Jim Bates
From:
Alvin, Texas, USA
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Posted 2 Aug 2015 2:13 pm
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It's fixed! Problem was that reverb 'tank' was not mounted properly. When I took it out of the 'pouch', a previous owner had re-mounted the original spring without any of the shock mount grometes. It was screwed directly onto a piece of 1/4" plywood. Removed the plywood, put four of original type shock absorbing grommets. covered the bottom with card board taped on with electrical tape. For good measure, I put a piece of "Duck tape" on the top of can (I guess could eliminate any Eigen frequencies (natural resonance peaks) that could give some unwanted 'honks' induced by the body of the can??? - or not)
Thanks for the tips. The original 'Gibbs spring is working just fine now.
Jim |
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Justin Griffith
From:
Taylor, Texas, USA
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Posted 2 Aug 2015 2:52 pm
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Great! Those amps sound s o good!
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Emmons/Sho~Bud/Blanton, Fender/Peavey.
Telonics pedal |
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