[opendtv] Re: New Chips Improve Color TV Dramatically
- From: "Cliff Benham" <cliff.benham@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 30 Jun 2004 10:07:41 -0400
In the CT-100, the original green NTSC phosphor was slower and darker =
and=20
produced a fairly dim picture. It may have been some derivitive of the=20
original P-1 oscilloscope phosphor.
All the reports I've read as well as my personal experience is that you=20
have to watch the set virtually in the dark.
So the change was made to a yellow-ish green phosphor in the 21AXP22A=20
to produce a much brighter picture.
This link to Ed Reitan's website provides a good description of the =
original
CRT and phosphor in the RCA CT-100:
http://www.novia.net/~ereitan/Gallery/CT-100_Gallery.html
Here's a link to some more information on the original 15GP22:
http://home.att.net/~pldexnis/the_15GP22.html
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of John Willkie
Sent: Wednesday, June 30, 2004 10:01 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: New Chips Improve Color TV Dramatically
Is it still as difficult to acquire the rare-earth green phosphors as it
once was (the reason I've always heard for using less-vivid green
phosphors?)
John Willkie
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of cliff benham
Sent: Tuesday, June 29, 2004 7:15 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: New Chips Improve Color TV Dramatically
Last summer, I saw NTSC pictures on a restored, properly adjusted
CT-100, the very first RCA color set
and the only "TV Set" ever built with an unequal bandwidth I-Q decoder
and a 15GP22 CRT, the only CRT ever to employ the original NTSC =
phosphors.
Next to it was a properly adjusted 12 inch (Sony Trinitron CRT)
Tektronix 650 color monitor. The source material was transferred film
and video on DVD.
The RCA had much darker, richer greens than the TEK, and produced a
subjectively more pleasing color picture than the TEK.
The RCA pictures had a very different look than the TEK and were more
preferable to me. The TEK produced yellowish greens.
If all the decoding and phosphor coordinates are so close, why did they
look so different?
Doug McDonald wrote:
>--- Alan Roberts <roberts.mugswell@xxxxxxxxxxxxxx>
>wrote:
>
>
>>Mark, we all agree that they are near identical.
>>
>>
>
>
>I do not agree. The blues are near identical.
>
>The reds are very close.
>
>The greens except the original NTSC (and Adobe RGB)
>green are very close. The original NTSC is wildly
>different from all the others (except Adobe RBG), and
>is wildly inferior. The NTSC green is green, the
>other are a rather sickly yellow green.
>
>And my eye is pretty well calibrated from decades of
>staring at pure, monochromatic, at the edge of the CIE
>diagram, lasers. I can tell with 10 nm the wavelength
>of any color, and within 3 nm for the 555-620 nm, just
>by looking. This gives some idea of what a trained
>person can do at the edge of the chart. Inside, while
>I can do pretty well at the dominant wavelength,
>I have no good ability to tell saturation ...
>especially in the blue-green.
>
>Doug McDonald
>
>
>=3D=3D=3D=3D=3D
>Doug McDonald
>my last name at scs dot uiuc dot edu, not here at Yahoo, please
=20
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
