[dtvmcdonald]

I remember from the late 60s when my elderly dad enrolled
in a tv repair course at the local tech high school that there
were lots of old Philco B&W sets that were super-complicated
in terms of having multiple chassis hooked together with
octal-plugged cables. I'm thinking I'd like to get one
to fix up.

Any suggestions?

Oh yes, one other thing: they (the high school classroom) had on display a 15GP22 that had been cut in half lengthwise with a carborundum saw and
one half cut further apart to see the shadow mask! There must
have been lots of old CTC-100s and 21CT55s and CTC-5s around Ft. Worth at that time since it was one of the very few cities that had color TV in the CTC-100 time frame.