[sean]

Guess I should have tested that link before I posted. Did you test the resistors in the set? If R153A is open (1125 ohms) that would eliminate your 150V supply voltage and could drag it down negative which is what you are getting with the negative voltages on pins 1 (filament), 2 (grid), and 12 (filament). The voltage on pin 11 (cathode) will be dependent upon the setting of your brightness control.