A further update on what I have learned:
SAMS does not list horizontal output tube current for the 25MC30/33 chassis but on the 24MC32 schematic it lists the current at 220ma, this chassis uses the same 6JS6 horizontal output tube but a different flyback circuit. Unfortunately neither the Zenith CM-106 service manual nor the Goodman Zenith Volume One service manual list a current value. All three do describe the same method for adjusting the horizontal sweep. See below for the Zenith CM-106 service manual directions.
With all of the controls set per the directions I tested at multiple line voltages ranging from 105v up though 120v while setting the high voltage per the manual and adjusted the horizontal linearity coil to get the lowest horizontal output tube current which ranged 215ma up to 240ma respectively. The regulator current was just barely at .85ma. If I raised the high voltage up as high as it would go which was about 26kv at the highest line voltage I could get the current down ranging 205ma to 225ma.
I can run the set with a bucking transformer and also run the high voltage a bit "hotter" to bring the the current down to say 210ma but am I missing something, what is left to check? Could there be shorted turns in the flyback? Surely some customers had line voltages at 120v+ back when this set was new and that would have the 6JS6 running at 240ma+.
