With nothing plugged in and the noise still there it most likely the output stage of the amp. If the unit is under warranty - tag it, bag it, and send it back for a new one. If not under warranty, you should remove the chassis and inspect for anything loose and spray the guts with zero residue contact cleaner. Use the cleaner liberally. Usually these output noises are the result of loose or dirty components. Clean all the electronics, put it back together and see if that doesn't get rid of the noise.
Good Luck!
Chad
SOURCE: Upon switching on the amp it starts crackling.
Here is a link that might help:http://www.geofex.com/ampdbug/ampdebug.htm Unless you have the tools and experience to work on your gear it is always best to take it to someone who is qualified to work on that particular amp. Your local Fender dealer should be able to recommend someone.
SOURCE: I had major static sounds from my yamaha stagepas
Chances are there is nothing wrong with the mixer. IF you accidentally turned on Phantom power, that would cause the problem. Phantom is ONLY used with condenser mics and a few DI boxes. Turning it on can create noise unless balanced lines are used everywhere.
SOURCE: I just bought a fender
Turn down the VIP knob and try it. This is on channel 1 for announcement voice overs overriding everything. It has a threshhold setting for adjusting that. Here is the manual for it.
http://support.fender.com/manuals/pro_audio/Passport_P150_manual.pdf
SOURCE: My Fender Hot Rod deluxe makes a popping noise when switching back to the clean channel.
I have seen this problem before. If not a valve issue check supply smoothing caps 22uf 500v
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