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Thanks for the help!
I am at work for a 72 hour shift but should be back to the set on Friday. I will bring meters and an HV probe. I will try the tube tapping, I did wiggle them. The filaments do remain lit when the screen goes dark. Sand resistor has been replaced when the set was restored. The thermistor is new but you never know so I will check it.
I think there has been a progressive deterioration. It started with some screen jiggle a few months ago. The first time it went dark we had run it for 20 mins or so. Last time I tried it took 10 minutes or so. I have plenty of spare tubes so when I go there this week hopefully I will find the fault or at least gather some more clues.
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