checked my zenith color service man (RL goodman) shows 290/175/640 for K/g1/g2.
check your HV and focus voltages. you will need a HV prob for this.
if you have not already, you should try a new 1v2 AND 3AT2. I generally sub out all new HV tubes when HV is not right. (damper,hot,shunt,hv rec, focus rec). If that fixes it I leave the new rec tubes in, and try the old HOT and Shunt to see if the HV holds. the rec tubes are cheap so I leave the new ones in.
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