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I was meaning the reg orange glow of the filament, I have seen some ghastly green glow on some shunt tubes, perhaps that is a gassey tube. I generally will set up the HV to about 23kv, which works out to about 1-1.5ma shunt tube current with the CRT cut off, and the current on the HOT at specified amount (185-210ma generally). With full raster, the shunt is around .3 to .5ma with very little flux in the HV 23kv.
I have read that if if the shunt current drops below the low amount on the full brightness, then turning the horz eff coil CW 1/4 turn will bring it back up (and increase the current above the min dip amount in the HOT). the idea being if the current thru the shunt drops too low it will be less able to regulate the HV. But the HOT current should still be within the specified max. If all that does not work then there is a problem somewhere in the HV circuit.
I know there has been some discussion on what the HV should be set at, I like to keep it no higher than 23kv, the idea being its less likely to arc over in the HV section of the FLY.
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