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Thread: Peavey Valveking 112

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    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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    Lifetime Member Enzo's Avatar
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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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    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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    Lifetime Member Enzo's Avatar
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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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    Thanks! I'll give it a shot.

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