Craig PC570 blue convergence

[jhalphen]

Hi to All,
Hi luRaichu,

Your Craig TV is working fine.

Alex KL-1 is correct, on a 5 inch color CRT (15CAC66X-TC10), "15" is the CRT's diagonal screen size, 15cm, hence 5".
The phosphor pitch is far too coarse for correct reproduction of B&W fine computer text.
In the lower part of your 2nd photo, the text looks OK and you wont get it better by fiddling with the purity/convergence magnets.
Top of photo looks messed up because of interference with the frame rate of the camera used for the photo.

The Craig like hundreds of private label 5" color TVs were relatively cheap small sets with rather low color pitch phosphors.

If you really want good B&W computer text visibility on a small color screen, you have to graduate to fine pitch tubes like the Sony PVM (industrial) or BVM (Broadcast) monitors with Trinitron HR (high resolution) tubes.

Computer monitors with Delta dot triad phosphors have much better resolution than CRTs for TV only, problem is computer monitors don't exist in the 5" size. Smallest i've seen is 9", and 12/13" was the standard for years in the 80s.

Best Regards
jhalphen
Paris/France