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Topic: Buzzing....Valves??? |
John O Keeffe
From:
Co Waterford Ireland
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Posted 10 Sep 2002 1:51 pm |
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My amp is buzzing since at a gig the other night even though I got it serviced a couple of months ago.
The volume went really low in it so when I turned up my tele... both steel and guitar became distorted.Its a peavey triumph valve amp and I find it a good amp for both steel and guitar.
I am wondering would replacing the valves stop it?All three valves light up but someone told me they could still be causing the hum.
Its been a while since they were replaced.
My local tech friend is away for a couple of weeks and I really need to fix it. |
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Stephen Gambrell
From:
Over there
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Posted 10 Sep 2002 4:19 pm
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I'd make sure all the tubes(valves)were seated in the sockets first. Pull each tube out, one at a time, and make sure the pins are clean, etc. Then push them back in, and see if the problem is still there. Sounds like a power amp tube.
Hey, wasn't it Grady Martin who discovered this? |
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Ken Fox
From:
Nashville GA USA
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Posted 10 Sep 2002 7:38 pm
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| There are I think four more tubes (valves) under a metal pan. These are the preamp tubes. The one 12Ax7 you can see is the inverter tube that feeds the 2 power tubes. I had a Triumph 60 with a similar volume problem, it was a cold solder joint. I also had a bad filter cap in the power supply later on that caused a light hum. I have a Triumph 120 now, a great workhorse of an amp. It's handle the loud gigs when my 1966 Deluxe is not guite enough! |
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John O Keeffe
From:
Co Waterford Ireland
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Posted 11 Sep 2002 10:46 am
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Stephen I tried reseating the valves already but If like Ken says there are tubes under a metal pan then I think I might leave it.I don't want to go messing too much with it incase I cause damage.
JOHN |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 11 Sep 2002 1:09 pm
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John, look at the power tubes with the amp on. If the plate (that big black piece of metal) in one of them is glowing cherry-red, it's got a heater-cathode short, and needs to be replaced. This type of short in an output tube will cause the problem you describe.
Now, if it's not a bad output tube (and you haven't got just a bad cord), it's most likely a bad connection or cold solder joint in the amp, and that will require a technician to fix it. |
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Jim Florence
From:
wilburton, Ok. US * R.I.P.
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Posted 12 Sep 2002 7:47 am
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My guess is an input filter capacitor in the power supply.
Jim[This message was edited by Jim Florence on 12 September 2002 at 08:53 AM.] |
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Johan Jansen
From:
Europe
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Posted 12 Sep 2002 8:03 am
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Sounds like the trafo to me ...
JJ |
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Ken Fox
From:
Nashville GA USA
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Posted 12 Sep 2002 9:08 am
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| If you must do power supply filters, get them from Peavey! They use a short stubby filter, radial leads, and the height is critical! Mallory caps will not fit in this amp, been there and tried it! |
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