One thing that may be of importance is crt orientation. Some of the color crt data sheets seem to depict an internal form of masking. I'm not sure if the phosphor dot mask is a full circle. It could be a circle with the top and bottom solid semi-circles, taking the form of a double D screen. Proper orientation will determine where the anode lead is positioned. Also take into account the position of crt's blue gun and blue lateral magnet.
Ed
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