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After looking at a schematic for a 16Z8C50, 1969 model, it was assumed the convergence rectifiers were silicon not selenium.
On this newer model, two 100 ohm resistors were replaced with 220 ohm, 1 watt. I used 250 ohm 5 watt since I bought a large quantity for other projects.
All other parts and adjustment pots were the same, leading to my conclusion.
I also found the right side R+G vertical adjustment coil was missing its slug. It was impossible to screw another one in. The coil ran hot, causing the distortion preventing the insertion of a slug.
Luckily, I found my tap set and had a fine thread 1/4" fit and reamed out melted plastic, so a slug could be inserted.
I always considered convergence circuits as black magic, affecting only parts of the raster. All together these adjustments affect each other. Lots of back and forth between static and dynamic convergence.
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"When resistors increase in value, they're worthless"
-Dave G
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