You can. Unplug it from the power. Unscrew the back part. Find where the input jack goes. Unsolder it from the circuit board. Cut it open. Take out the input cable. Close the input jack somehow. Solder it back on to the circuit board. screw the back part back in. And hope that it works. Or you can go the cheap way and take it to a guitar tech store. Or just find out a less technical/easier way. On my amp(s) I have made it so that if that happens, I can take out the input and take it out since I made a hole in the back to push anything that gets stuck out. The amp still works btw.
This is far too complex of an answer, and a justification to spend money on the unneccessary. HE just pushed the input in, which is attached to the circuit board by WIRES. Which means you can push it back through and glue it back onto the outside part so it stays in place, without rewiring it. Its very simple, open the back and push it back through the hole.
(also, I dont think bones is an expert on amps, I recall him making a help thread on such a subject)
