[RodB]

OK, if you check the schematic, you can see the problem is an open primary coil in the output transformer. At the junction of the field coil and filter cap where the schematic shows point F, you measured about 200 volts of B+. Follow the wire up to the center tap of the transformer primary. The voltage passes through the primary to both plates of the 41 tubes. If there's zero volts on the plates then the primary is toast, which I'm just getting ready to have with coffee. Further, I'm pretty sure that the connection of the black/white lead of the transformer has been somehow disconnected from the primary coil since there's no voltage on either tube. If the coil itself is open then we would see one half of the primary open and the other still good.