The book lists the ranges on page 195. These are all approximates:
340-360VDC on pin3
300VDC on pin 4 (grid)
140-160VDC on pins 1 and 6 (plates)
320-330VDC on pins 4 and 6 in from transformer
I havent measured at A, B, and C, but the above is what you are shooting for.