Quote:
Originally Posted by maxhifi
I think I am fortunate with this chassis, it has a ton of adjustments, and the demountable convergence board can be accessed from the front. Convergence sure was easier than I expected, although it did take me a while.
Purity is tricky though... mainly because the tube is so deep that it's difficult to adjust it and see the screen at the same time. I need to read up a bit about what the purity rings actually do to the electron beams - the function of the other magnets is fairly obvious, but the how the purity rings actually work seem a bit elusive to me.
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After a thorough degaussing here's how to set up purity on roundies, and this is from the original RCA factory procedure. It's worth bookmarking for future referance. (It applies to RCA clones of course, as well as Zenith.)
Set the service switch for blank raster and turn blue and green screens all the way down and red screen up. Loosen the yoke clamp and slide the yoke as far back as it will go. Use the purity rings to put the red blob as close to center as possible. Slide the yoke forward, watching to see where the best red purity occurs. This is counterintuitive, because normally the "sweet spot" will occur 1/2 to 1/4 inch before the yoke is fully seated against the CRT bell. Clamp the yoke at that point.
On rectangular sets up through the CTC-25 etc., the procedure is the same except the 'sweet spot' normally occurs about 1/4 to 1/8 inch before the yoke is fully seated.
oc