Hi Butta,
What model is it? Check at the rear on the plate for the model number. Then look at the bottom for a removable panel- usually wood, sometimes replaced with metal, sometimes missing. You'll either see a small chassis containing the electronics, or a plate screwed to the back panel (the later models- you can see the power transistors) On either of these chassis you'll see the multipin connector. This carries the 110V AC supply from the organ console, the audio input (unbalanced) and the rotor control signals for the motor relays. It looks like an Octal tube base- but usually 9 or 11 pin.
If there is a 1/4" jack, it has probably been modded for general studio use. It's very easy to mod them back to stock.
Let me know which model, and I'll see if I can find the manual, got most of them around here somewhere.
Mark