Re: Safe to apply mains?
It sounds like the CRT is the original GEC, but most likely to have been made by Mazda (as were most of the GEC branded valves in the TV). Mazda CRTs have a poorer reputation for long life them most Mullard types. So, I would certainly try to check if the CRT is viable first.
I expect this CRT will have a 12.6V heater.
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