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Originally Posted by ARC Tech-109
The chassis is a 20Y1C37 (Sams set 932 folder 3) similar to your avatar shot but not as clean. Im still having issues with blue convergance especially in the top corners almost as if its a blue only pincushion problem and adjusting the blue conv controls helps center up the blue but also warps the blue parabolis with respect to red/green in the vert plane, any ideas on this one? It had the same issue before the deflection yoke was changed so I dont think the yoke is the variable but Im baffled a bit more than slightly.
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Have you replaced the plastic cased selenium rectifier on the convergence board? My 15" Zenith had convergence problems until I replaced it. It's a common failure. You can construct a replacement out of ordinary silicon diodes. It also had some bad soldering on the convergence board. I had to resolder all of those metal connection points on the convergence board.