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Author Topic: Squeeling amp  (Read 1523 times)

ailean

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Squeeling amp
« on: October 09, 2007, 05:36:24 AM »
My Peavey ValveKing has started squeeling when it's switched on. Not every time, sometimes the problem will go away if I switch off and back on again.

It's louder when a guitar is plugged in but always there, the volume control affects it so I'm assuming it's before the power amp stage. I've swapped cables and guitars and the sound persists.

The sound is (as best i can describe) a cross between static hiss and squeel.

I'm hoping this is a tube problem, but can you get intermitant problems with a tube or do they just blow?

Any advice would be welcome, I've not had much experience of a tube amp, and the only thing I know about them is they sound good!
Gibson LP std + Nailbomb set
Diezel VH4 & Orange Rockerverb 50

hunter

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Squeeling amp
« Reply #1 on: October 09, 2007, 05:55:08 AM »
Sounds like tubes to me. Pre- or Power, hard to say... I'd bring it to a tech to have checked.
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maverickf1jockey

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Squeeling amp
« Reply #2 on: October 09, 2007, 06:53:41 AM »
Are you using a distortion in front of the amp?
I have a similar problem and it's to do with the pedal feedbacking at high gain.
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Twinfan

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Squeeling amp
« Reply #3 on: October 09, 2007, 08:20:47 AM »
Sounds like a pre-amp tube to me.  Try swapping their positions around and see if helps/makes it worse.  If it does, get a set off JJs in there  ;)

Fourth Feline

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Squeeling amp
« Reply #4 on: October 09, 2007, 11:34:29 AM »
Quote from: Twinfan
Sounds like a pre-amp tube to me.  Try swapping their positions around and see if helps/makes it worse.  If it does, get a set off JJs in there  ;)


Agreed.

Gently tapping the side each pre amp tube with a pencil usually reveals the culprit. I had very similar symptoms/outcome with my Peavey 'Classic 20'  some years ago. From the factory they had poor quality pre-amp valves. Hope it works for you .

F.F.

ailean

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Squeeling amp
« Reply #5 on: October 09, 2007, 08:03:52 PM »
Thanks guys. I'll have a play.

Maverick - No, nothign but guitar and amp.
Gibson LP std + Nailbomb set
Diezel VH4 & Orange Rockerverb 50