Okay, can't move forward until I clear this up

[DaveWM]

per Zenith 40-180=-140 overall bias

Per yours 33-190=-157 overall bias

extra -17 v neg bias does not seem like it should be too much, but I don't now that for sure.

the 40 or 33v on G1 is a simple voltage divider of a 390k and 75k resistor connected to the 250v source. if the 390k has drifted up that would reduce the G1 bias.

the 190 is a result of the bias and the load on the output transistors. for that I would look at those resistors on the service setup and maybe the 18k collector load resistors on the output transistors (they go to the 250v source).