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OK it sounds as if the solid state diodes are working ok and producing a decent B+ voltage for the set as measured on the cap. Now this voltage passes through the speaker field coil (part #60 on the schematic) to a second cap (part #27a on the schematic) the second cap should have about 180VDC or so between the + side and chassis ground. If that voltage is not present, it is possible that the field coil is open.
If you can't locate the second cap take another picture that shows a bit more of the wiring, and I can try to spot it.
Does the speaker plug in to an outlet on the chassis or are the wires just soldered to the circuit?
jr
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