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A HUMMING Peavey Classic 30

Hi All. I have a Peavey Classic 30 guitar amplifier, with all the original components within it. Recently it has ceased to operate normally (I cannot hear the guitar) and when I turn it on it literally hums, at first softly, but then ever increasing (I switch it off after about 4-5 seconds as it sounds like it is about to explode). This humming occurs whether or not I have all, any, or none, of the volume/effects settings active. I have the amplifier plugged in directly to the outlet, and no external devices between it and the guitar.
Is anyone aware as to what the problem may be? Is this something a person with a basic understanding of electronics and possession of a soldering iron could fix...or should I head off to a repair shop? Thanks in advance for your advice. Ari

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  • ari842 Mar 18, 2008

    Thanks for the advice Scott. I have a feeling, however, that a poor connection is not the problem as the amp had been working fine for the past 3 years and I had not moved (or otherwise disturbed) it during that time.
    Also, if one can check for burnt out tubes in the same way as burnt fuses, the tubes appear in good order.

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I have a Peavey Classc 30 with the same issues. It sounds like the Caps to me. How can I test the Caps?

Thanks
Luke

Posted on Apr 29, 2008

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I repaired a classic 50 recently and the problem was a bad solder connection on the main input jack. You may also want to have the tubes tested.

If the unit is over 20+ years have it recapped.

I do this stuff but Vermont might be to far.

Scott

Posted on Mar 18, 2008

  • Scott Frye
    Scott Frye Mar 18, 2008

    Tubes are far more complicated than fuses. I would try those first.

    Power supply caps,if they are in failure, will cause the amp to hum something fierce.

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