CTC4 Convergence Pots

[ohohyodafarted]

Originally Posted by Kevin Kuehn

Bob, Nice job on rebuilding those pots. That sounds like it was a major chore.

Am I correct in assuming that you ended up using 600V rated elements to replace the 1000V ones in the 500K screen pots?

Yes Kevin, the replacement elements are basic 600volt CTS brand carbon comp units. The main issue is keeping the original twist tab mounting the same. The twist tabs often break when removing the old pots, so it is a good idea to have some NOS twist tab pots that you can canabilize to transplant new twist tab mounts onto the rebuilt pots in order to remount them on the phenolic insulator like RCA did.

WRT the 100 ohm dual concentric pots, the twist tabs are of no consequence because these pots ride at low voltage and instead of using twist tabs I convert the mounting to a conventional threaded sleev and nut style, and the hole in the convergence chassis is already large enough to accomodate a lock nut type of mount as shown in the photo above.

Good luck!