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The Set: Pete Deksnis's Site about the CT-100

Restoring a Vintage Color Television Set

A measure of CT-100 matrix alignment results.

Images below are from the same frame/exposure and were taken through a green filter.
The image was then desaturated, or made black and white, before conversion to these for-the-web jpegs.
These luma-only displays should eliminate monitor-camera-eyeball hue variables.

TOP: November 7, 2005. Photo of an RCA CT-100 screen after matrix alignment displaying over-the-air color bars from WNET channel 13.

Each image is approximately in proportion to its size in the original image.

BOT: Photo of an RCA F-38310 HDTV displaying the same over-the-air color bars. Both sets are connected to a common rooftop antenna.



Note the smooth continuous tone of the upper left portion of the CT-100 image. In the HD set, individual vertical bars are visible, indicating a nonlinear representation compared to the CT-100.

The same is true for red filter images. The blue results are nearly identical except for a very slight advantage for the HDTV.

These exposures were made in a dark room; a separate color shot of the operating sets is shown below.
reen on the yello
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t could be part of the difference. Ideally, you should have a gray background wall in the room lit by daylight or artificial daylight to compare to, or at least be able to look outside at daylight for comparison. Anyway, in turning idown the green and blue drives, it helps to go too far (slightly pink whites) if you can get there, then return to a neutral white, rocking the controls back and forth while you zero in on the neutral point.