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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.
Tubes run hot in order to function. They degrade over time unlike transistors which usually work or don't work.
You should keep some spares around especially if you are out doing gigs.
Guessing at which tube is bad will be expensive.
With the renewed use of tubes in amps, there may be some tube testing available at a music store. Call around and see. Pull all you tubes and go test them.
Symptoms that take a while to happen often are caused by something getting hot. Open it up and try to find something getting hot. That probably won't be the faulty component but it will point to the area that's causing the problem.
BE CAREFUL INSIDE A TUBE AMP! THERE'S A LOT OF HIGH VOLTAGE IN THERE. DON'T TOUCH ANYTHING METAL.
If it is within warranty take it back to the shop. If not then its going to need an engineer to look at it. Its not worth fooling around inside a tube amp as the capacitors can retain lethal voltages even when unplugged.
Some hiss at high gain settings is normal. If you get objectionable hiss at 1 o'clock settings of gain, that is too high. Electronics has noise that is "statistical" in nature due to physics that we can't get around in design. Most hiss is created in the preamp area and swapping tubes in the first stage might help. By varying the volume controls and observing the level of the hiss, we may be able to analyze the offending staage of amplification. ALso turning up the treble controls will increase the hiss, as it is mostly in the higher pitches.
The amp has likely got a shorted output section or a shorted component in the power supply. Unfrtunately the previous is the most likely AND EXPENSIVE to repair.
You are probablly overdriving the unit. Too much gain saturates the electronics. The noisegate really only works to eliminate noise when input signal is below a certain level... it is NOT used or effective when at high signal levels. If you set gain too high the tiny signals will open the gate. The noise gate will prevent low signals like guitar "handling" noise from passing through until you are actually playing the guitar. This is the purpose of the noise gate.
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