By the way
"Pots" refer to potentiometers, usually rotary controls with round knobs. On the 500 there is only that one "Mic Vol" that uses a rotary pot. You'd have to get inside the unit and look at the part that the rotary knob is attached to underneath, that's the pot. You would look for a number code.
If you find the code, you could try here:
http://www.guitardaterproject.org/potcodereader.aspx
It could have been sitting around for a year or more before being installed, and it also could be a later replacement since they do tend to wear out. So it doesn't really tell you very much about when that particular 500 was made.
"Pots" refer to potentiometers, usually rotary controls with round knobs. On the 500 there is only that one "Mic Vol" that uses a rotary pot. You'd have to get inside the unit and look at the part that the rotary knob is attached to underneath, that's the pot. You would look for a number code.
If you find the code, you could try here:
http://www.guitardaterproject.org/potcodereader.aspx
It could have been sitting around for a year or more before being installed, and it also could be a later replacement since they do tend to wear out. So it doesn't really tell you very much about when that particular 500 was made.