[RodB]

I only found one instance of part 97 so one of the caps must not be used. The other one across the filter choke is not required.

Unfortunately it appears the primary of the transformer (83?) is open. This is very common for this transformer for this period. There's a slight chance it may be a loose connection between one of the wire leads and the coil wire. You can open the transformer and peel away the outer layers of paper to examine the wires. They will be soldered to the coil wires. I do happen to have one I just pulled from a chassis. Not sure how close a match it is but I can check. There's a work around that uses a coupling cap and the transformer secondary. It's in the Phorum library. I'm using the workaround in my Philco 650 and it sounds just fine. If you use it, be sure to completely disconnect the primary from the circuit.