R201 should be 15K according to my schematic.
We might have to modify R210 and R213 to increase bias voltage range. Let's wait on that issue.
So there's still nothing but weak and distorted audio at your speakers, even with the OPT secondary 8R taps wired directly through to your speakers? R41/141 have been removed or shorted out?
Here's one way to test the OPTs: Yank the output tubes and drive the OPT 8-ohm secondary backwards from a 5VAC or 6.3VAC source such as a small filament transformer, with a one-ohm current sampling resistor in series. The voltage across that resistor tells you how much current the unloaded transformer is taking. A good OPT will consume only 50~200mA of magnetizing current in this test, while a shorted one could easily take over ten times that much. Make sure the sampling resistor can handle at least 5W. Voltage on the primary side will normally be quite high during this test. For example, an 8K:8R OPT has a turns ratio of 32:1, so primary voltage would be 6.3 * 32 = 202V end-to-end or half of that from CT to either end. If magnetizing current is suitably low, then check primary voltages as confirmation of a good OPT. Be aware that interrupting live connections between the filament transformer and OPT secondary can have bad consequences due to unloaded inductive reactance, so make those connections secure and switch power only to the filament xfmr primary. Use a variac instead, if possible.
Dandy: The heater-cathode short apparently occurred only in one tube and only when it was cold.
