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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Re: guitar amp make large crescendo-like noise, loud pop...
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.
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This is because your clean channel only runs through the pre-amp section, requiring an increased volume level to match that of the volume of the drive section which is overdriven by the pre-amp circuit. my suggestion is to use lower volume level on the clean channel of the amp. To get any volume boost you may need to match the two channels you could use a signal/volume booster or overdrive pedal between your guitar and amp input, switching it off and back on when you switch back and forth between channels.
It sounds like somehow the pre-gain is very high while the volume or post-gain is very low. Try turning the volume high on the effects unit and the gain low, and don't have the amp volume too low either.
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.
If you get the screech without the guitar connected, then TRY a new guitar cable. Make sure it is an INSTRUMENT cable... I have seen some try to use speaker cables or junky 1/4 inch cables intended for home stereo... these will NOT work and can cause the feedback. The next possibility is a broken jack on the amp. This would require repair. The common cause of this is to fail to run the cord through the handle of the amp... one trip on the cord or step on it pulling the plug sideways in the amp and the jack is broken and it is a trip to the shop as well. While on the subject ALWAYS run the cord at the guitar end either through the strap or your belt loop. Cords left dangling keep rotating and soon wear out the plug and also the jack in the guitar and then that has to go to the shop.
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.
The knocking noise when cuts off , is a compressor internal motor support spring , broken . This does not mean the compressor is bad , only noisy for the rest of the compressor life , but should be covered under the 5 yr warranty . The gurgling sound is the refrigerant being pumped thru the system . The buzzing could be from the compressor also . My suggestion , would be to call a factory warranty company , to see if they can replace the compressor under warranty .
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.