I pulled the dual selenium AFC diode and tried to check it on a DMM and a VTVM. I got infinity on every range. I'd read these were tough to test. There seems to be some debate on what to replace them with as well:
http://www.antiqueradios.com/forums/...c.php?t=110903
I just went with a couple 1N4007 because I have a bunch on hand. The horizontal sync is definitely more stable now. I'll poke around for some 1N914s too. I'm curioius to see if there's any difference.
The contrast and retrace lines seem better now as well.
Although the earlier screenshots I posted look good, the set and a tendency to either lose sync or drift off center like this.
Here it is with the new diodes installed
Now, you have to really crank the hor. lock control way off center to lose sync.
