Amp Crackle

Try take off the back(Make sure it's not plugged in!!!!) and make sure there are no loose wires. If you don't find any then try replacing the plug(for the guitar not power). If that doesn't solve it you'll have to take to a good reputable shop.

Would you say it may sound like a poping? If so thats not good, it could mean high voltage in the amp has found some path that cannot stand the high voltages and discharges suddenly.

The tubes themselves will sometimes develop internal, intermittent arcs. Do some tube swapping. Start at the preamp end of the amp and pull a tube, listen, pull a tube, listen. When you find one where pulling it makes the popping stop and a new tube makes it quit completely, you're done.

Arcing power tube socket. The B+ may be arcing across the surfaces of the output tube sockets themselves. This is often the case when an amplifier has a lot of dust and dirt inside it. Intermittent breakdown of coupling cap or a popping resistor, intermittent breakdown of output transformer or choke, broken resistor or capacitor or R/C lead/ wire, heat from resistor or output tube melting solder.

You can sometimes leave the amplifier turned on and turn out or dim the lights and see arcing happining. These are a few things to look for.

Joe

I had an old Fender tube amp and the caps and tubes were about 20 years old. I could not make the crackle stop. I had it checked out and my tubes and caps needed replacing.

Try take off the back(Make sure it's not plugged in!!!!) and make sure there are no loose wires. If you don't find any then try replacing the plug(for the guitar not power). If that doesn't solve it you'll have to take to a good reputable shop.

Be aware that there can still be quite a bit of electrical energy in the tubes and capacitors even after the thing is unplugged. Try to work with one hand in a pocket, and avoid metal tools.