I have been on this crusade for a few years now, and have previously posted on AA about this.
I have a FM-1 with multplex, and am trying to align it. A year ago I replaced the failed PS cap with discrete caps, replaced the plate resistors for the tubes on the PC-8 board, replaced coupling caps C29, C31, C82 and C83. I did a tabeltop alignment by the manual, the issue came with aligning T73. The stereo light would stay lit the entire time. I could hear the signal go from mono to stereo and back to mono as i turned the slugs from bottom to top, and left them in the middle of the two phase switches. It worked fine, with the stereo light on all the time and after i resoldered L-1, reception was very good.
Fast forward to now. I now have an old signal generator, set it to 10.7000**MHz and tried to align the IF stages properly with the tuning eye. The issue is the bottom of T1. There was no movement of the eye when i turned the slug. If i went ALL the way up OR down, i could get a small closing change. The other T1-T4 slugs behaved normally. I did not remove the gimmick, should I have? Is there something else causing the bottom of T1 to not respond?
I did not replace anything on PC-7.