U5000-seems ok then goes bright for about 10 seconds

ArcRevival

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U5000-seems ok then goes bright for about 10 seconds

So I picked up another chassis that was supposed to be rebuilt and working. It works for about 3 or 4 mins and then goes full bright for 5 to 15 seconds then reverts back. B+ is at 116 then of course drops when the screen goes bright. Tried a different neck board, same issue.
Now I know why people hate these monitors.
 
I'm not sure if I have another tube I can test it on but I agree, it's looking like there is a short in the tube unless the flyback is defective from stock.
 
i had a 7400 flashing and shrinking due to some cold solder joints on the flyback and resistor near the b+ pot. Might be worth a check for giggles.
 
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