Motorola roundie

[dtvmcdonald]

Originally Posted by old_tv_nut

Actually, modern flat screens have much better color than the old CRT sets, IF you turn off the "lighthouse" default sales-floor mode and set them to a calibrated mode. This is especially true because of the much better contrast (consistent, blacker blacks) of flat panel sets.
This was not true with the very early flat sets because makers had not gotten the hang of compensating the extreme non-linearity of LCDs to match the ideally smooth non-linearity of CRTs.

I would not say that the color itself of the new flat screens is much better.
It is the basic light intensity curves, which are obvious in B&W. The perfection of gray scale if of course better too. That's because they are all adjustable ... but most people don't do it. And in many cases the default so-called "correct" setting is artificially far to dim (to match the default too-dim screens of movie theaters).

I can and have gotten my old Sony Bravia and my CT-100 to be essentially perfect matches by adjusting the Sony gamma to match that of the CT-100,
which is not ideal. IF you adjust the Sony to the correct gamma, you can get either mid-tone hues to match, or high-tone hues to match, but not both at once. This is with the Sony hues correct. I can do the same with my high-end Dell "Photoshop edit" monitor. This is with the one additional adjustment I added to my CT-100 color matrix, which gives complete control. The correct setting is within the standard resistor tolerances, but noticeably off the nominal value.

The difficult hues are in the yellow vs yellow-green and purple vs. violet areas.

[old_tv_nut]

Originally Posted by dtvmcdonald

...This is with the one additional adjustment I added to my CT-100 color matrix, which gives complete control...

What adjustment did you add?

[dtvmcdonald]

Originally Posted by old_tv_nut

What adjustment did you add?

I don't remember for sure. It was one of the six resistors from the I and Q
phase inverters to the three adders. I thought about which adjustment direction was missing. I thought again just now and come to the conclusion that it had to be one of the two resistors coming from the plate of the Q phase inverter.

Its no longer there. I had already replaced the six resistors with high stability
1% ones, and when I got the adjustments right I replaced the pot with
one of those fixed ones. As I said, it was within the stated 5% tolerance of those resistors.

If you look long enough at the list of adjustments, i.e. CRT screens, user color control, blue and green video gains, I gain, and relative demod phase, you come up with one degree of freedom too few for complete control.

As I have said innumerable times, this set has, for a single VHF channel,
81 adjustments. I adjusted every single one. The most critical are the two yoke tilts and two yoke lateral shift adjustments. Get these right and essentially perfect convergence is possible. Interestingly, when I replaced the CRT they did not need changing significantly ... the marks I had made were just fine.

Zenith's famous quip is wrong.

[Alex KL-1]

Originally Posted by dtvmcdonald

I would not say that the color itself of the new flat screens is much better.
It is the basic light intensity curves, which are obvious in B&W. The perfection of gray scale if of course better too. That's because they are all adjustable ... but most people don't do it. And in many cases the default so-called "correct" setting is artificially far to dim (to match the default too-dim screens of movie theaters).

I can and have gotten my old Sony Bravia and my CT-100 to be essentially perfect matches by adjusting the Sony gamma to match that of the CT-100,
which is not ideal. IF you adjust the Sony to the correct gamma, you can get either mid-tone hues to match, or high-tone hues to match, but not both at once. This is with the Sony hues correct. I can do the same with my high-end Dell "Photoshop edit" monitor. This is with the one additional adjustment I added to my CT-100 color matrix, which gives complete control. The correct setting is within the standard resistor tolerances, but noticeably off the nominal value.

The difficult hues are in the yellow vs yellow-green and purple vs. violet areas.

And, in the transmissive displays, the color converges to gray at low light scenes due to light leakage (loses color space). Is more obvious when compare against OLED.

Granted is the better quality on newer panels, allied with 100-point adjusting and internal processing. But is amusing to compare that very refined and advanced device against a simple and humble CRT color TV using all tube tech... if we consider all differences, is a miracle the results achieved by the old techs