http://www.radiomuseum.org/r/zenith_9s232_waltons_9_s_232_ch5.html
Wiring under the chassis is pretty deterministic: resisor off B+ to the target anode wire; ground wire; wire to the "hot" side of the 6.3 VAC heater bus; and the control grid wire. Four wires total. Don't forget the 1 Megohm resistor inside the socket that provides bias for the triode plate.