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12-08-2007, 12:07 AM
| #1 |
| Member Join Date: Feb 2007
Posts: 25
| Peavey Valveking 112
I have this peavey valveking that sounds weak and distorted. I've replaced the preamp tubes, phase inverter tube, power tubes, and check for opened resistors. I didn't find anything. I've noticed a defective 4560 IC and replaced it, but it didn't resolve the issue. What could be causing this?
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12-08-2007, 05:36 AM
| #2 |
| Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA
Posts: 9,266
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Isolate the problem, is it the power amp or the preamp that is bad? Apply a signal to the input and trace it through the amp, find out where it doesn't make the jumpe from stage to stage. |
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12-08-2007, 07:35 AM
| #3 |
| Member Join Date: Feb 2007
Posts: 25
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It looks like it's in both. There's distortion coming out the main speaker and distortion on the preamp: going from the send on the effects loop to the input jack of another amp.
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12-08-2007, 11:26 AM
| #4 |
| Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA
Posts: 9,266
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Well, if the distortion is present at the preamp out, it won't disappear going to the power amp. APply a clean test signal from somewhere else to the power amp input. As to the preamp, as I said, apply a clean signal at the input and trace it through stage by stage. |
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12-08-2007, 10:54 PM
| #5 |
| Member Join Date: Feb 2007
Posts: 25
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Thanks! I'll give it a shot.
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