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whoever restored it likely put in a solid state replacement for the vibrator.
The intermittent could be anything, and may not be because the guy who repaired it did a bad job. For 350 I would expect he replaced all the capacitors, aligned it, and replaced the vibrator, tested tubes, etc. Could be a bad solder joint or connection, a bad tube (not too likely), a shorting mica cap in an IF can, etc.
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