Basically, I turned it on, played it, turned if off, went back to play it and I got a humming noise then it went dead!!??

sounds like bad caps and maybe a failing output transistors. Use Deoxit contact cleaner too.

Check the reverb tank for bad or loose connections. Also check for cold or bad solder connections

Try reloading the factory presets. If that doesn't work seek out an experienced audio technician.

Yes it can.....but you will need the schematics and some test gear in order to do it.....and a soldering iron....what do you mean by no surround on the speaker?? Can you post a pic??

Are all the tubes lighting up? they should glow like dim light bulbs. If not, replace them with the same model type (12ax7, or EL34 for example).

Often there are two fuses, one to protect the speaker and another to protect everything, it sounds like the latter fuse may be burned out. take it out and take it to radio Shack for exact replacement.

You take it in for electronic repair. Unless you are electronically adept at troubleshooting and repair this is not DIY. Probably one side of the PA transistors has shorted. You can blow the speaker if you keep trying to use it this way.

may be one of the electrolytic capacitors in the power supply has become leaky...this is a common problem among amplifiers...so you let it cool down..then after a period of time the capacitor heats up and then causes the hum...the power supply caps filter out the 60 hertz ac line noise...which is probably the frequency of the sound it is making...this is a good indication of these caps going bad....another thing you can check is to see if the amp is properly grounded(eg: the ground pin on the plug is present) and that you dont have an open cord or input

Of course it is repairable.

Find a competent repair person. You did not describe the "noise". If it is 60 cycle hum, the filter caps need replacing. If it is an organ tone, then probably a key contact is stuck.

I would also be inclined to check all the larger electrolytic capacitors in the power circuits as well for AC bleed.

try connecting speakers to another sound source or if you have access to a ohm meter, check impedance of speakers, should measure 4~8 ohms.