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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Thu Apr 08, 2010 2:34 pm Post subject: |
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Cool read! Can you imagine having one of those on the ceiling?
My uncle had the same shirts and side burns in the 70's 
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CRT.
HD done right!
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Thu Apr 08, 2010 2:43 pm Post subject: |
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I wonder what ANSI would be if you made a schmidt-type lens setup for a modern CRT PJ? Internal reflection ought to be reduced pretty dramatically.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Apr 08, 2010 2:44 pm Post subject: |
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Cool article! It's amazing to me that the "prototype" pictured on the cover practically didn't change at all for at least, what... 5 years? Man, things moved so slowly back then... Now, it's all disposable, new models every year, last year's model is obsolete, and 5 years later, you can hardly find parts or support for something.
SC
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Thu Apr 08, 2010 5:48 pm Post subject: |
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Guys!
The Advent projector was my entre to selling video gear. More important was IBM's purchase of a Model 1000 with rgb input and a special box from Hughes Aircraft that extracted a video signal from a 3178 terminal. This led us to an Electrohome dealership in Michigan eventually, and doing a lot of work for IBM and others.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Thu Apr 08, 2010 5:53 pm Post subject: |
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| perisoft wrote: | | I wonder what ANSI would be if you made a schmidt-type lens setup for a modern CRT PJ? Internal reflection ought to be reduced pretty dramatically. |
Not practical really, not a lot of light output, and the focal distance is fixed with those optics. The Novabeam featured magnetic focus, and threw an excellent picture for the day.
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Thu Apr 08, 2010 10:02 pm Post subject: |
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I sold and set up a CRT projector on one of those screens once. Totally awsome (in daylight no less). 
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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Kiev Savoie
Joined: 25 Oct 2007
Posts: 432
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| Posted: Thu Apr 08, 2010 11:26 pm Post subject: |
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The screen manufacturing process looked like something that could be tackled in a garage project, if one were so inclined... It sounds like they were using air pressure as the actual form. I would not have expected that to work out into a perfectly spherical shape.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Thu Apr 08, 2010 11:52 pm Post subject: |
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| Kiev Savoie wrote: | | The screen manufacturing process looked like something that could be tackled in a garage project, if one were so inclined... It sounds like they were using air pressure as the actual form. I would not have expected that to work out into a perfectly spherical shape. |
The foil was placed on a bulge inside a form, then fiberglass maybe a quarter inch thick was laid down on the back of the foil and allowed to harden. That piece as glued to a backing so leg hardware could be applied. The foil gave a screen gain around ten.
We had the first VideoBeam dealership in the country that was not a hifi store, in Detroit. We told Advent we wanted to sell to bars and restaurants, and they liked the idea. I met the Advent rep in 1974, James Wellnitz, found out later he was here in Phoenix five years ago selling rebadged Marquees as Accurate Imaging, and ended up replacing Chris Stephens as his technician two or three days a month.
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donaldk
Joined: 17 Jun 2008
Posts: 308
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| Posted: Fri Apr 09, 2010 1:35 am Post subject: |
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Guessed you missed Jeremy's reminiscings about his neighbour over a year ago, as it was in avs' f=86 and not in f=16 section. In the past I have posted a link with timestamp indication, to a Dutch TV documentary on the life of Silvia Kristel, briefly showing this machine in action when it was still in its prime. Perhaps some-one can still trace the post, and perhaps the link still works, as the public broadcasters have been messing up their websites, making it harder to find and access stuff.
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donaldk
Joined: 17 Jun 2008
Posts: 308
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| Posted: Fri Apr 09, 2010 1:40 am Post subject: |
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Sony introduced its 1200 parabolic screen front projector at the same time, Sony has been one of the most consistent and longest parabolic silver screen suporters around it seems as they carried those at least till Sony stopped carrying CRT projectors at the turn of the millenium
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donaldk
Joined: 17 Jun 2008
Posts: 308
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| Posted: Fri Apr 09, 2010 1:44 am Post subject: |
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Indeed projection tv has been around almost as long as tv, as public performance use was one of the first things that came to mind, following the creation of television. Live cinema. Both electronic and mechanical tv system projectors, even light valves were used back in the mid-thirties.
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