CTC-16 combo

[marty59]

Those are some great looking screen shots. Looks like you've got that gray scale spot on too....does it stay uniform throughout the brightness range?

[old_coot88]

Dave,
The purity setup procedure is as follows:
Get an all red screen (blue and green screens off), slide the yoke all the way back and center the red blob (using the purity rings). Slide the yoke forward gradually, looking for best red purity. The "sweet spot" will occur approximately 1/2 to 1/4 inch before the yoke fully seats against the CRT bell. Clamp the yoke at that position. No kidding. This is the RCA factory procedure and the way we always did it 'back in the day'. Same on the 19 and 25 inch rectangulars, but the 'sweet spot' is usually about 1/4 to 1/8 inch from the bell.
Bill(oc)

[DaveWM]

Bill try as I may I can't get the red blob in the middle (the procedure you described is what I did). Red screen up, yoke back, best I can do is get the red in the middle/and left side. I normally can get the red blob and have the blue and green sort of around it in 3 separate clouds. This one just does not want to behave. I try rotating the rings together as well as operating them separately, and a combo of both (rotate together and try apart).

I did not try the grey scale tracking with brightness will get back to you on that.

[sampson159]

those rings usually dont go bad.try another yoke?had a 15 back 25-30 years ago that had the same issue.was a bad yoke.we played with it for a few days and changed it out.took care of the problem

[DaveWM]

roger that I have a NOS yoke just looking for a home.

I am sure there is something up, I have done roundies before that worked just fine on the purity setup.