Well, keep it in context, on the CRT V8 note what the pins do. Pins 3,6,8,9 are deflection plates, and whatever voltage you find on them is coming from V2 and V5 plates. And pins 1 and 11 are the CRT tube's heater, which runs on 6VAC. However I do expect pins 4,7, and 10 to be smooth DC.
If that final test I suggested just gives a few millivolts, then it is fine.
Look at the schematic for vertical drive tube V2. Note grids pin 2 and 7 have identical resistances betweem grid and ground. Note further the position control is just a 50k pot between the grids with the wiper connected to B+ through the 100k resistor. By turning the control back and forth we change the balance between the voltage at the left and right grids. Centered, I expect the control to put aboput the same voltage on both grids. You got 33v and 17v. You might turn the control back and forth and see if it balances the two out at some setting reasonably close to center on the control.
A leaky 0.1uf cap to pin 2 COULD be upsetting the balance. I hope I am not leading you down the garden path.
And furthermore, the plates of V2, pins 1 and 6, connect to pins 6 and 9 of the CRT. DO you see about the same DC voltage at each?