I'd pull the output or damper. It's possible that the negative supply in the 630 biases the output such that it won't red-plate when the osc fails, but even if that's the case I wouldn't want to count on it.
The 630 and CTC2 were the 2 cases where RCA let their engineers build a perfect set without much cost cutting to speak of so they seem over engineered compared to later sets.
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