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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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1 Answer

I have a Peavey Valve King 112. When I plug in my guitar I get nothing.The power light is on and the preamp is on as well.There is just silince.No humming or crackling.


This could be anything. You could try swapping the preamp tubes. If it were a power amp tube problem, it is likely the mains fuse would have blown, Since the pilot lamp is still on, we will assume that the problem is at the preamp level. This absence of signal can be caused by a dead tube, or more complexly, by a faulty resistor or capacitor in the signal path. If you can't resolve the problem by swapping preamp tubes with a known good one, you should take the amp to a tech experienced in servicing tube guitar amps. Any good tech should be able to sort this out within an hour of labor time. I doubt it will require any expensive parts. It may even be as simple as a loose/bad connection, either from manufacturing, or from normal use. Pro tube amps are subjected to levels of heat, vibration and electrical stresses that consumer electronic gear never sees.

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Hi, Peavey Classic Guitar amp , Has NO SOUND


Hi Mike,

If you switch on the amplifier, do you hear nothing at all?
Or do you hear low level noise or hum out of the speaker?
Don't know if you're technician.
If the tubes are glowing, you can measure the high voltage.
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Hello,

Unless there is a 240/120 switch on the back, this amplifier cannot change voltage. The only way is to replace the power transformer, and when you do that you need to use the exact model transformer Peavey uses for the 120 version. I have also seen differences in handling power outside of just a different transformer for USA/Euro models.
The differences between these two market models might be beyond what is cost-effective to convert.

If it is the Peavey blazer 158, they go for as cheap as 100 bucks here in the states. Or buy one new for 120.00 bucks and 4.99 shipping: http://www.dcmusicstore.com/Peavey-blazer-158-guitar-amplifier

Best advice: sell it for what ever you can get and buy one here.

Hope this helps!
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Guitar amp


You can order parts directly from Peavey. You'll have to call to place the order. You can use the followng email address to check price and availability.

 

parts@peavey.com

 

For more information, the third question/answer in the list of FAQs has the phone numbers.

http://www.peavey.com/support/faq/index.cfm

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