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After you get the C49 thingy sorted out, take another look at the 6V6 output stage and see if it's "version 1" or "version 2".
With the revisions shown in the schematic, the output stage itself has seen a fair bit of engineering fudgery, probably to optimize linearity.
In "version 1" the plate and screen (pins 3 and 4) were simply strapped together. Kind of unusual.
In "version 2" the screen is supplied from B boost (again kinda unusual), through added-in resistors R96 and R97. Cap C69 is added from the plate to screen, probably to tailor the waveform. And bypass cap C71 is added to filter the boost line.
If your set has "version 2", those two caps should definitely be replaced if not already. And the two resistors checked for value. oc
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