[Yamamaya42]

First, don't take what is in the RCA service manual as absolute, the will be variations, I worked with that and the SAMS, and found that thing are sort of halfway between what is shown in both, don't look at what is listed in them an what voltages MUST BE, more sort as a guide.

And since ground is not AT ground in this set, but going through a bleeder network to produce negative voltages, any problem in one or more of them on the chain like the 135v line or more will tip everything out of balance and give weird voltages and odd results, like bandersen found out when he accidentally turned his focus coil into a battery by dunking it in Evapo-Rust.

something has upset the balance of your power system.
most likely in the 135v line.