Quote:
Originally Posted by Zenith26kc20
I used ceramic disc caps years ago on my TS-4 and never had issues. I did have to replace them when one ceramic disc failed in the vertical. The problems I have had were caused by too much B+ when I replaced the seleniums with silicon diodes and did not (at the time) install dropping resistors.
Make sure all of the high value resistors are good and that your centering adjustments can go thru their range properly.
Also, excessive sweep height can make the vertical touchy. Since the TS-4 and the TS-18 are close, it sounds like too much B+. Also, If I remember right, the vertical output tube can be a problem. I remember trying a few before the set settled down.
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I do find that the vert is stable when I adjust the vert size to smaller but the vert pot is still maxed. I changed the seleniums to diodes and I think the b++ is 257v and b+ is 140 v I did check the hi value resistors but none were bad enough to change. I did try another 6sl7 but no change. With the ceramics the pic is perfect, however I do notice when I shorten the pic by the vert size it's clear but filling the screen it goes out of focus just slight. 2 other ts18 s I didn't have this problem.