You need a pure red blank raster to do purity.
Best way is turn down the G & B G-2 controls & turn up the
red to abt its normal. To get it blank unplug the tuner IF
cable from the IF mudule ( 150-???). Put the cable in a safe place.
Now you can do purity if need be. Be sure the set has run
1+hours first. No need to go through the gun killer stuff.
73 Zeno
