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W/o that volume plugged in, there is nothing to keep that grid pulled low, and it will float high, causing the tube to bias on.
If it keeps acting up, what I would do is.
Replace BOTH c54/c56 with something like 667-ECW-H20103HV & c55 with something like 667-ECW-H8102RHV , and so on.
There is a tie to boost voltage via r82, but since there is no diode on this line, this means there is a strong horz pulse there, c54 is there to filter that, c56 is there as bypass and let only audio to the output stage, if ANY of these caps are faulty, DC and/or horz pulses can be passed on to the output.
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