A quick google took me to "restoring the AR-3a" at classicspeakerpages.net. This pdf has everything you could possibly need to know about that AR.
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Find the terminal, on each pot, that leads to ground(#1) and cut that lead. The other two terminals(#'s 2 and 3)on each pot, need to be connected together, via a jumper wire(bypassing the pot's resistive element and wiper). Or- you can clip the wires from the terminals(2&3), and connect them together. Terminal #3's lead will be coming from the crossover element(the pot's input), and #2's lead will be connected to the respective driver(pot's output).