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Update. I just put the bypass caps back in. You're right, the chassis stays at 60v above ground (or half way between AC line). If the set is plugged in the correct way, it is safe in both on and off positions.
It didn't affect the performance that much though. The only difference is that sometimes the thyratron engages automatically upon warmup, rather than remotely (I repeat, sometimes). Since disconnecting or shorting the grid coil doesn't turn the tube off, I think we can eliminate the preliminary receiving/amplification stages as the source of the problem. Sometimes the tube will engage with the coil disconnected simply by poking at the socket with a meter probe.
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