[mstaton]

I have a ctc9 and I installed a used 21fbp22 crt. Emissions are very good, life test is good but green is a little weak. No shorts. The problem is my HV cannot be changed but if I unplug the CRT, I can adjust it some. Max when crt connected is 21KV. Cathode current on the HOT is 180ma. Also if I turn up the red drive, the HV drops like a rock. Brightness could be better. I replaced most of the caps. B+ is right on spec, Color is good. All tubes are good. Focus has to turned all the way to one side to be good. Any thought on whats causing the HV to drop upon red drive adjustment?