Re: My first foray into Old model TV repairs.
Valves missing from the line output often indicate that someone has been there before and found the line transformer has gone.
Yes, powering the tube heater from a correct voltage supply from a separate power supply and looking for the 'glow' will confirm the state of vacuum.
You'll not find a replacement dropper, so test and if necessary tidy up what's there.
You'll need to get first light BEFORE going to a lot of trouble with this set, as transformer and tube problems will make it not worth bothering with - sometimes you just have to be realistic with these things.
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