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Early Colour CRT's

 
Nuvistor
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The early colour TV Museum have a wonderful catalogue of those devices. The site is well worth exploring.

One interesting story.

http://www.earlytelevision.org/uniray.html

It just shows that although the shadow mask in various types was the work horse of colour CRT's for many years, there was lots of R&D to find better types.

Frank

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Topic starter Posted : 04/12/2016 12:48 pm
Till Eulenspiegel
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Hi Frank,

              the Philco colour tube is an excellent leit motiv to many other interesting early colour display systems.

Worth researching is the CBS Chromatron tube which eventually morphed into the Sony Trinitron tube.

From Wikipedia:    http://en.wikipedia.org/wiki/Chromatron.

Till Eulenspiegel.

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Posted : 04/12/2016 4:01 pm
Nuvistor
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The Chromatron, diagram and specification. 

http://www.earlytelevision.org/pdf/chromatron_data_sheet.pdf

I will have a read of the Wikipedia article tonight, thanks.

Frank

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Topic starter Posted : 04/12/2016 6:07 pm
davidh1041
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DSCN2101
DSCN2102

This RCA dates from 1963 and employs a round CRT. They suffer with "cataract" where moisture gets in between the implosion screen and the CRT. Look at the size of it's neck!

David

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Posted : 12/04/2018 10:10 pm
Nuvistor
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Are you generating an NTSC signal for test card F? It’s a decent picture, is it the original CRT?

There doesn’t seem a lot inside that cabinet for a 1963 CTV, I presume the valve technology used required fewer signal stages, or is it an optical illusion with a big cabinet?

Thanks for posting.

 

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Topic starter Posted : 13/04/2018 7:55 am
davidh1041
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Hi Frank, this set is a monster and with its mains transformer very heavy. The chassis comes out very easily and was designed to be removed back to the workshop and repaired in a jig. The case is metal with woodgrain effect. The set has been converted to PAL in the past, but could easily be returned to NTSC.

David

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Posted : 13/04/2018 10:54 pm
Focus Diode
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It might be the same set I once owned. After a G6 it looked generally simple in comparison! Unfortunately it was missing several valves and with the lack of service information available and a source of valves, remembering this was in the days before the World Wide Web I couldn't proceed any further with it.

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Posted : 30/04/2018 9:11 pm
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