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Have you checked the high value resistors on the reg tube? If it uses two 1.5M resistors they need to be a matched pair.
You may want to look into upping that B+, either by removing load from it or perhaps connecting the set to a variac and cranking the line voltage to the set a bit above what is coming out of the outlets. Remember conduction is determined mostly by the G-K voltage difference.
Also if you have a service manual for that set it likely will tell you how to measure reg current off of resistors in the circuit...That info may help.
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