United Audio 175 different schematic versions

[jeffbro]

I'm trying to sort out a 175 and have collected the original UA schematics from several places. I have noticed that some of the schematics show V2's plate voltage as 80V and others (with the same surrounding component values) show the V2 plates at 200V. The attached schematics even have the same C-10475 drawing number. Is one of those voltage values a typo or have I overlooked something that would result in both those numbers being accurate?

 

[moamps]

If the resistors and electron tube are the same in both schematics as is the supply voltage, then it is clear that one of the measured voltages is wrong.
You can easily determine which schematic is wrong by using Ohm's law and consulting the output characteristics of the 12AX7 electronic tube.