A friend with far more experience than I with record players stopped by today. It took most of the day, but in the end he did get it playing!
* Motor mounts have been replaced
* Changer mechanism lubed and working
* Crystal cartridge replaced with a modern ceramic one.
* Idler wheel has a dent but grips OK - I will look into replacing it
While he was working on that, I took another whack at the 15AP4 CRT.
I went through all the various restore/rejuv modes in the CR70 "beam builder" with no results.
I was about to give up when I gave the Manual restore 2 mode (the most aggressive) one last try.
This time I finally got a flash in the gun!
Emissions finally appeared but weak. Also the grid shorts test is borderline.
If I crank the filament juice from 6.3 to 8 volts, the emissions are also borderline.
So, let's give it a try.
Eventually I found the ion trap magnet sweet spot and got an image.
Brightness and contrast have to be set low on the image goes all weird. Sort of washed out and inverted.
I installed a brighteener and it improved a bit.
Other issues continue to crop up though. Keep in mind the image should fill the entire screen as this is a porthole set.
It is also sporatic. We had a decent image that just about filled the screen. Turned the set off and back on and now it's like this.
Stretched on left and compressed on the right.
I'll go back to the small test CRT while I troubleshoot the sweep circuits.
