1963 Zenith 29JC20 restoration

[Zenith6S321]

Originally Posted by old_coot88

Before even thinking of messing with alignment, try subbing the last IF tube. It can cause ringing that can be mistaken for misalignment.

On that stripped gear, your shrink tubing collar is a good idea in addition to epoxy. "Belt and suspenders" redundancy.

I tried changing each and all of the three IF tubes with some change to the ringing. Three new tubes in place of the originals does have a bit less ringing. I will try an alignment this weekend.

I'm gonna add the epoxy to the gear too.

Dave

[Penthode]

Originally Posted by Zenith6S321

I tried changing each and all of the three IF tubes with some change to the ringing. Three new tubes in place of the originals does have a bit less ringing. I will try an alignment this weekend.

I'm gonna add the epoxy to the gear too.

Dave

I found that all of the Zenith color roundie convergence coils are interchangeable. The latter ones might not aesthetically correct but at least they are better made and more rugged.

The epoxy trick would not fix the broken fine tuning gear on my Zenith. The reason was that the plastic appeared to have shrunk and epoxying it would have left a considerable gap between teeth at the break. What I did was to cut an O from the end of a BIC pen, the inner diameter of which was roughly equal or slightly smaller than the gear when compressed to close the gap. With the fine tuning shaft removed, I heated it with a large soldering iron until it would just begin to melt the gear and then with gear compressed around the shaft, I slipped on the BIC ring to hold the gear compressed.

Fix ensured the gear melted into the splines and there would be no gap between the teeth where the break was. It was bit fiddley to fabricate and install, but the result worked like a charm.