[OldTechFan96]

Further PSU Investigations:

B of T301 (BD157): ranges from -3.38V to -4.11V when adjusting HV pot.

Collector of T301 (BD157): ranges from +315V to +525V when adjusting HV pot.

IC voltages:

Pin 4: -7.2V. The -12V goes through a 3k3 resistor so the -7.2V figure sounds about right.

Pin 7: +13V. Correct.

EDIT: the above measurements were taken with the HV rail disconnected from the CRT section. I thought this would be worth mentioning.