I just picked up an 1981 T-40. The previous owner did some minor circuit mods, and I just want to compare the circuit to the stock diagram. But the only diagrams I can find online are dated 1983, and seem to have a slightly different circuit than mine, particularly the tone controls. Mine has resistors, but the 1983 diagram doesn't. Does anyone know where I can get an earlier schematic? I don't think my circuit has been monkeyed with too much... someone just disconnected one of the coals to make the neck PU a single-coil. But I just want to be sure. Any help appreciated. Cheers... Peter