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Guitar amp make large crescendo-like noise, loud pop at end.

I posted this up recently and am adding a bit more info- I have an approximately 1-yr old Fender Deluxe Reverb-Amp and it has recently begun to make a noise-floor like sound that increases in volume until it pops really loud at the end. I tried unplugging both the footswitch pedal and also the speaker jack and it still makes the noise, randomly, and repeatedly, whether the volume is up or not. Moving the pots makes no difference; it seems to be coming from an internal isolated problem. thank you for the help!

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Get rid of your guitar, hey... :) by the way do you like jam

Posted on Mar 22, 2009

  • jampotman Mar 22, 2009

    i believe in corn on the cob with lettuce so just sell your guitar and get a sausage dog instead. problem solved!

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Same loudness, no speaker? This sounds (no pun intended) like a filter capacitor shorting out. Open it up and VERY CAUTIOUSLY look for what is making the noise. Filter capacitors can eject hot stuff. Very dangerous.

Posted on Jul 23, 2008

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Yes, there are several possibilities. First thing is to disconnect your guitar and then plug in the cord to the amp. Expect a bit of hum. If it screeches, then problem is not feedback via the guitar. If it doesn't MAYBE your guitar is "hearing the amp" which the guitar is then a microphone and can feedback. Moving the cable generates electrical noise which can trigger the feedback to start.
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Possible that the output tubes that were replaced are drawing too much current, hence the popping sound (may be "motorboating", one common word to describe a similar sound)

This means the tubes need to be biased properly. You need to get it to someone who knows what they are doing, ie a good amp tech, not GC. The voltages here are dangerous.

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If the noise is a pop or click, that's normal. Any other sound could be caused by too long a cord, which will produce noise while on the floor.

If it's not the cord, then you most likely have something wrong with the wiring inside the guitar. Have a luthier (guitar builder and technician) look at it, and s/he should be able to fix the problem.


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I own a Peavy classic 30 tube amp. it just over a year old but recently i has started making loud cracking noises and i have to turn it off. any ideas?


There is a transistor in the front end that is starting to fail. This creates noise in the signal line that is being amplified. The other cause of this is dirty volume controls. Try spraying the pot with an electronics cleaner first.
Keep us posted.
Dan

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