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check out your tubes....it sounds like one is working its way out of its socket or you have a microphonic tube...may be time to replace them and have the amp serviced while you are at it. ...Does one tube have a whitish look? inspect them/.....are there any cracks? while it is on...tap them with a lead pencil...something NOT metal...does it make a loud noise? These are all indicators there is something going on with your tubes..Good luck
On mine, the guitar input jacks get tarnished and causes all kind of interference and noise. Take a Q-Tip soaked with WD-40, run in down into the jack and brush up and down. Don't overlook the filter caps as they are a common cause of noise. You need a capacitor checker (the older tube type) to thourghly check those out.
Disable ALL digital settings....problem gone? If not, with tube guards and/or shileds removed try lightly tapping on each tube (one at a time). Does your amp go crazy while tapping one particular tube? If yes then it is new tube time.
It sounds like a filter capacitor(s) has failed. The electrolytic caps dry out and cease to perform allowing unfiltered power to reach the preamp sections and get amplified.
Being this is tube with high voltages, an experienced person should work on it due to shock danger.
I assume you checked the tubes for shorts as well as emission since a heater to cathode short could cause this as well.
Try checking to make sure that all the tubes are properly seated in the tube sockets and that one wasn't broken at the base. Considering that you just bought it you should be able to take it back and have it serviced for free.
You suspect the power switch when you should have immediately dismissed it because the ON light is on, as it should be. The fact that it does in fact produce sound at all indicated that the amp is being powered on. There is a malfunction somewhere else in the amp, most likely a bad tube. If you have access to a tube tester, then by all means, have the tubes checked. You could check your guitar and cord with another amp to make sure that they are working OK. Beyond those simple things, it's my opinion that for you to open this amp and attempt repair, you would risk further damage.
it would be much cheaper and quicker for you to take the amp to a
qualified repair shop and pay the price for a competent repair.
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