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  #46  
Old 08-16-2016, 11:15 AM
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Quote:
Originally Posted by NewVista View Post
A pair of these iconic Tek monitors were auctioned off (cheaply) at last ETF!
They were iconic and ironic in so much as all that money for a soft picture!
I wonder who made the tube for the prototype hi-res Tektronix monitor?
I'm guessing their production monitors used selected standard Sony units.
IIRC, later large-screen rack-mount (19-inch rack) Tek monitors (19 inch?) had a special fine pitch Trinitron and chroma dot filter that could be switched off. Eventually, they even produced rack-mount high def monitors.
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  #47  
Old 08-16-2016, 01:17 PM
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I had a Sun Microsystems 21" monitor with a Trinitron. It was one of the best monitors I have ever seen. It had better resolution than the first generation flat screen computer monitors by far. It had more convergence adjustments than a 21" round CRT TV. It was a power hog and weighed 65 lbs. I still miss it.
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  #48  
Old 08-17-2016, 11:41 AM
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Originally Posted by old_tv_nut View Post
IIRC, later large-screen rack-mount (19-inch rack) Tek monitors (19 inch?) had a special fine pitch Trinitron..
Around what year did these emerge?
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  #49  
Old 08-17-2016, 12:08 PM
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Originally Posted by NewVista View Post
Around what year did these emerge?
I really don't remember. Would have to do some research.
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  #50  
Old 08-17-2016, 02:38 PM
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Then there were the consumer market (circa 2002) full HD resolution Super-Fine-Pitch trinitrons that had perhaps the highest resolution (dot pitch wise) tri-color CRTs ever made.
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  #51  
Old 08-17-2016, 07:21 PM
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Is the Tek 650HR the fine pitch version?
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  #52  
Old 08-17-2016, 10:24 PM
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looking at the illustrations:
http://www.recycledgoods.com/tektron...tor-19869.html

I think this may be the Tek "high-res" one, but I now believe I was confusing this with another brand of monitor that had a larger tube that filled the rack width, so all controls were at the bottom instead of the sides. The stripes appear to be visible in the closeup, and my guess is they are finer than the regular tube, but still not as fine as you would really like.
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  #53  
Old 08-18-2016, 01:31 AM
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Quote:
Originally Posted by old_tv_nut View Post
looking at the illustrations:
http://www.recycledgoods.com/tektron...tor-19869.html

I think this may be the Tek "high-res" one,..
The photo of its back panel shows a manufacture date of July-1982.
I think they caught a lot of flak in the 1970s for the original versions.
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  #54  
Old 10-05-2016, 04:52 AM
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The Coronation took place in June 1953 ... so no NTSC standard let alone a 405 line version was in place.
The experimental system was apparently a field sequential system.

The set is almost certainly a projection set or the image is a slide lit internally from behind.

The later 405 line NTSC tests came about as a result of pressure from ITV which wanted colour for commercial tv. Sir Lew Grade apparently believed colour would mean advertisers would pay more.

The BBC was not too keen but did carry out tests but was more interested in waiting for the 625 line system which first broadcast on UHF in 1962 as BBC2.

Colour arriving after a long debate, using PAL, on July 1 1967 for Wimbledon, although tests had been carried out in 1966.

Ironically 405 line NTSC and 625 PAL would have looked pretty similar given the actual displays ie resolved lines on the sets of the day.

Which was part of the reason BBC did not want 405 line colour.
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  #55  
Old 10-19-2016, 07:42 PM
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JUST NOTICED THIS RECENT POST:

"[QUOTE=ceebee23;3171224]The Coronation took place in June 1953 ... so no NTSC standard let alone a 405 line version was in place.
The experimental system was apparently a field sequential system."

TRUE. IT WAS AN EXPERIMENTAL FIELD SEQUENTIAL SYSTEM. IN FACT CHROMATIC LABORATORIES PITCHED THE FACT AT THE FCC TRIALS THAT THE CHROMATRON WOULD NOT ONLY WORK WITH THE RCA THREE GUN SYSTEM, IT WOULD WORK WITH THE CBS FIELD SEQUENTIAL SYSTEM, THEREBY ELIMINATING THE CUMBERSOME SPINNING COLOR WHEEL OR DRUM.

"The set is almost certainly a projection set or the image is a slide lit internally from behind."

POSSIBLY, OR THE PHOTO WAS AN EXPERIMENTAL CHROMATRON FIELD SEQUENTIAL COLOR TELEVISION SET UP AS DESCRIBED ABOVE BY THE VARIOUS POSTERS ON THIS THREAD.
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  #56  
Old 10-19-2016, 09:14 PM
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Would a Chromatrom screen be as flat as it appears in the image.. It would be exciting to think it was a Chromatron!
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  #57  
Old 10-20-2016, 10:14 AM
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Quote:
Originally Posted by ceebee23 View Post
Would a Chromatrom screen be as flat as it appears in the image.. It would be exciting to think it was a Chromatron!

Here is a spec sheet of the 1953 version of the color Chromatron courtesy of ETF. Notice how square and flat it looks.

http://www.visions4.net/journal/wp-c...ds/image11.jpg
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  #58  
Old 10-20-2016, 12:03 PM
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A perspective transform and overlay indicates that the Chromatron on the spec sheet would not fit that cabinet.
Attached Images
File Type: jpg chromatron overlay.jpg (6.8 KB, 21 views)
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  #59  
Old 10-20-2016, 12:25 PM
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Quote:
Originally Posted by old_tv_nut View Post
A perspective transform and overlay indicates that the Chromatron on the spec sheet would not fit that cabinet.
Interesting, but dose not debunk the fact that the photo may be an experimental Chromatron. You are basing your theory on the mass around the square image surface.

Couple of things. That overlay may not be to scale. The spec sheet states the tube is 221/2 inches. There are at least two sources that say the color Chromatron sets used in the chrildrens hospital were 20 inches. The Chromatron was manufactured in different sizes.
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  #60  
Old 10-20-2016, 12:57 PM
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Not to mention that screen surround probably shrank as development progressed.
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