1.5 meg reads 1.7 so that is a bit out (5% resistor) but that does not seem far enough out.
I am going to see if I can get a direct read of the grid and cath voltage, I am thinking maybe the cathode is low, it goes to the 350v so I will start there.
It would seem that if the over all B+ is low the boost would be low also, but maybe the relationship between the two could be upset? The boost is the source (thru a resistance series and the HV pot) for the shunt grid bias.
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