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2006-06-11, 21:57
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New Blood
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Join Date: Jun 2006
Posts: 1
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Serious Amp Problem
So I recently purchased a used peavey 5150 212 combo amp from a music store via ebay. The amp was described as used but good working condition and the seller was pretty reputable. Anyways the amp arrived and was extremely well packaged and looked great. The tubes were removed and seperately packed and i plugged them back in.
So I fire up the clean channel and it sounds decent, but when i turn the EQ knobs and the reverb knobs, nothing happens... Then I switch the amp to the lead channel and there is totally horrible feedback like the pre-amp settings are cranked to 10 or something. From what I can tell basically, the 3 EQ knobs, along with the reverb and the lead pre-amp knobs simply dont respond to being turned. (These 5 knobs are all adjacent to one another)
While I have played guitar for many years I have always let the techs work on my gear (installing tubes and biasing etc), but in this case I'm at a summer school program thats pretty isolated from any decent music tech shop. Anyways, does anyone know what sort of problem could be causing this so I have a better idea how to go about getting it fixed?
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2006-06-11, 22:14
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Post-whore
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Join Date: Mar 2005
Location: London, UK
Posts: 1,841
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Sounds like you have a/some preamp tubes gone there. You could try swapping round some of them to see if it changes the situation- then you can confirm that it is a blown preamp tube. If that is the case, i'd suggest getting a new set, they're easy-peasy to install, and all _should_ work fine 
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Originally Posted by Undone
moonraven?....more like ass raven
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2006-06-11, 22:21
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Crusher of Skulls
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Join Date: Sep 2004
Location: Somewhere down the road
Posts: 2,188
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Only bad part about that is if you don't know how to bias em, you are pretty much screwed from making it sound really nice.
The knobs though, maybe the pots are just bad...I don't know. At least its not going up in smoke on you. (had that one happen before)
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Originally Posted by far_beyond_sane
You thought of mixing wheat flour with saturated fat, and putting it the resultant shit in a styrofoam cup. Shine on, you crazy dead yellow diamond.
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Originally Posted by johnmansley
May the best cunt win.
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2006-06-12, 00:44
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TEH PWNZOR!!!1qa
Alumni Staff
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Join Date: Aug 2003
Location: The West.
Posts: 4,433
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Sounds like a preamp tube issue. No rebais there, just by new tubes and pop them in. If they fix the problem, you're all set. If not, you have some spare tubes. 
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2006-06-12, 00:53
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Wasted Custom User title
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Join Date: Feb 2004
Location: Minneapolis.
Posts: 5,002
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preamp tubes are cheap too. Power amp tubes are more expensive..
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2006-06-17, 01:29
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Metalhead
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Join Date: Feb 2005
Location: Syracuse, NY
Posts: 75
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I doubt it's a tube, but if you have any spares kicking around it certainly can't hurt to try swapping them. Sounds like it might have been banged around during shipping and caused something to come loose.
Jerry
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