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Topic: Peavey VTX Classic 2X12 |
Keith Cordell
From:
San Diego
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Posted 12 Aug 2006 3:29 pm |
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I got one of these amps today and it is so clean I might have dinner off it; It sounds amazing but has a little hiss. Being tube amps, any mods anyone has seen and had experience with on these amps? I have heard good things and I think this one sounds way better than I would have expected. If I can make it better I will be glad to do it!
It has peavey labeled square speakers, I have a feeling I'll be changing those; but I don't know for sure what they are rated at. Any thoughts, info and opinions are appreciated. |
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Ken Fox
From:
Nashville GA USA
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Posted 12 Aug 2006 4:08 pm
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It is a hybrid, solid state components right up to the power tubes. For proper impedance matching to the power tubes they are cathode driven by a pair of driver transistors. Great amp.
GFirst I would try to isolate the moise problem to the preamp or power amp. This easy to do. Insert a very short guitar cord or an open 1/4" jack into the power amp input. If the noise goes away it is coming from the preamp stages.
I would try another pair of power tubes, if you have a spare set. Another option is to take the preamp out to another amp to see if the noise is coming from the preamp stages. Still there are 4 transistors and 1 IC chip (op amp) in the power amp section that could very likely culprits for noise.
A lot of time the preamp out and power amp jacks have never been used. They often can use a good cleaning. You will need to pull the chassis to do that properly.[This message was edited by Ken Fox on 12 August 2006 at 05:12 PM.] |
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Keith Cordell
From:
San Diego
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Posted 12 Aug 2006 4:14 pm
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| Thanks Ken! I am pretty sure that it is the original power tube pair in there. I will get some JJ's and see what happens. I am flatly shocked that it is solid state with that overdrive sound in the automix, it is very natural sounding sepecially if I push the amp with a booster. Not quite sure how it works, but it does! |
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Ken Fox
From:
Nashville GA USA
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Posted 12 Aug 2006 4:19 pm
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| Also the preamp stages use a lot of 4558 IC chips. This amp would benefit much by using Burr Brown chips for these, lower background noise and a sweeter tone. The Burr Brown OPA2604 is the chip I use in the Profex 2 upgrades I do. Peavey does the same and also uses them in the mod kits for Nashville 400 and other steel amps. [This message was edited by Ken Fox on 12 August 2006 at 05:19 PM.] |
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Keith Cordell
From:
San Diego
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Posted 12 Aug 2006 4:24 pm
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| Sorry, I misidentified the amp, it is a VT Classic, probably from the 70's. |
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Jon Light (deceased)
From:
Saugerties, NY
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Posted 12 Aug 2006 5:58 pm
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| I chopped one into a head. I find for steel (pedal) that I need to turn the mid control down to zero. I go back & forth between liking to use it (at home ) and not much caring for it. I've never taken it out--have too many great sounding rigs to use this one. But it is indeed a viable amp. |
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Keith Cordell
From:
San Diego
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Posted 12 Aug 2006 6:00 pm
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| I neglected to mention that it is being used almost exclusively for overdriven lap steel. It seems to have a very warm tone with my OD808. |
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Ken Fox
From:
Nashville GA USA
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Posted 13 Aug 2006 4:12 am
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The Classic VT is also a hybrid, op-amp/IC in the front end and transistors driving the power tubes. The signal from the transistors drives the grids of the power tubes, a more conventional tube power amp. Pretty much the same applies for trouble shooting the noise.
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