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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).
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