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Could you take a picture that shows the end of the capacitor that is above the one that the diodes are connected to? I think that it is C27 and C27A and the Red and Blue leads that are visible in the picture connect to it. If that is the case the red lead should measure about 180VDC to chassis ground and the blue lead about 100 VDC to chassis ground.
The fact that the pin is missing on the tube is of no consequence YET as the diodes are getting voltage from the blue wires attached to pins 2 and 3. You could pull the tube and still get the same voltage at the first cap (part #62 on the schematic).
jr
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