[Ron Ramirez]

Antenna and ground leads replaced with new cloth-covered wires that are the same color as the originals (green for antenna, black for ground).

Off-on-tone switch cleaned. Using my DMM, I can see that the tone control is functioning as it should, yet I still hear no difference in tone when switched from "high" to "low". Possibly a bad cap or two in the tone control circuit?

Whatever. I've buttoned it up, put it back in the cabinet, and set it aside until the better speaker arrives. At that time, I will revisit the tone control circuit.