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Advent Videobeam 1000 Screen
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AnalogRocks
Forum Moderator


Joined: 08 Mar 2006
Posts: 24582
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Sat Sep 16, 2017 6:25 am    Post subject: Reply with quote


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Spanky Ham wrote:
Why do you want a 4x3?


To match the original Advent screen

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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Sat Sep 16, 2017 2:52 pm    Post subject: Reply with quote

Spanky Ham wrote:
Why do you want a 4x3?


Both my projectors are 4:3, and I prefer to be able to use them in their native aspect ratio when I can. I don't like permanently blanking off the top and bottom areas of phosphor.
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Spanky Ham



Joined: 22 Mar 2006
Posts: 5574
Location: Comedy Central


PostLink    Posted: Sun Sep 17, 2017 5:52 am    Post subject: Reply with quote

Do you watch a lot of SD or 4x3?
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Sun Sep 17, 2017 1:35 pm    Post subject: Reply with quote

Spanky Ham wrote:
Do you watch a lot of SD or 4x3?


Depends on what I'm watching, really. Movies are mostly 16:9. TV is about 50/50 16:9 or 4:3. But I also play video games on it, and those are ALWAYS in 4:3.
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Sun Sep 17, 2017 2:19 pm    Post subject: Reply with quote

You did get me wondering how wide I could potentially make a screen before having to change my projector setup, though. I messed with my Sony projector settings a bit and it looks like I could potentially go up to a 14:9 at 84" wide, which actually would be a good compromise aspect ratio. Something to consider when I get around to building my new screen, I guess. Although from what I've seen, the Videobeam is intended to project higher up on the wall than where I have my current screen, so if I intend to build a Videobeam compatible screen I'll have to take that into account when I build the new screen and I might not *quite* be able to go as wide as 84" depending on how far I can adjust my Sony's tilt on my homemade ceiling mount.

(Although I would have to get shorter speakers if I made the screen any wider without moving it up on the wall. Currently using floor-standing speakers and the one on the left is sandwiched pretty tightly between the screen and the wall.)

EDIT: Nah, the Sony can't really be tilted up any further due to a fluorescent light fixture that's in the way. I can shift the raster up maybe another 6" on the wall, but due to the shape of the phosphor area wouldn't be able to make the picture any wider than it is, and besides wouldn't be able to clear the top of my existing speakers with a shift that small. That does make using the Videobeam a problem, but I'll worry about that after I fix it. Maybe I can make the new screen hang off hooks at the sides or something and have a couple of sets to move it up and down, but it will still have to be 4:3.
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UncleWill



Joined: 11 Dec 2012
Posts: 317
Location: WashDC area, ViennaVA

TV/Projector: Electrohome 8500


PostLink    Posted: Wed Sep 20, 2017 4:44 am    Post subject: Reply with quote

How about this one? Located in Laredo, TX. You could haggle this down some.

http://www.ebay.com/itm/ELECTROHOME-FIXED-movie-projector-screen-7-foot-OPTICAL-SURFACE-SCREEN-/172693556827?hash=item2835568e5b:g:ZooAAOSwBt5ZJgNa
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Wed Sep 20, 2017 6:15 am    Post subject: Reply with quote

UncleWill wrote:
How about this one? Located in Laredo, TX. You could haggle this down some.

http://www.ebay.com/itm/ELECTROHOME-FIXED-movie-projector-screen-7-foot-OPTICAL-SURFACE-SCREEN-/172693556827?hash=item2835568e5b:g:ZooAAOSwBt5ZJgNa


That's... actually not bad. I'd actually consider paying that since they're willing to ship it. I'll give it some thought.

Although that split in the back does worry me some... It looks like it would probably need to be braced to retain its shape.

EDIT: Also, after a second look, there might be a crease or something in the upper right corner? Not sure.
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UncleWill



Joined: 11 Dec 2012
Posts: 317
Location: WashDC area, ViennaVA

TV/Projector: Electrohome 8500


PostLink    Posted: Thu Sep 21, 2017 5:30 am    Post subject: Reply with quote

Good eye. I missed those things.

Let's be honest...With a 30ish year old screen though, you're doubtful to get perfect.

I'd mention those things imperfections to bring the price down. Otherwise, you may have a match!
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Thu Sep 21, 2017 12:07 pm    Post subject: Reply with quote

UncleWill wrote:
Good eye. I missed those things.

Let's be honest...With a 30ish year old screen though, you're doubtful to get perfect.

I'd mention those things imperfections to bring the price down. Otherwise, you may have a match!


I sent them a message mentioning what I saw and asking them to elaborate on the condition yesterday morning. Haven't heard anything back yet. I suspect they just intend to ignore me because they're probably not interested in selling to someone who asks questions.
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Spanky Ham



Joined: 22 Mar 2006
Posts: 5574
Location: Comedy Central


PostLink    Posted: Sun Sep 24, 2017 3:39 pm    Post subject: Reply with quote

If you do a search for Torus screens, then you should find plenty of info on how to build your own.
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Sun Sep 24, 2017 3:44 pm    Post subject: Reply with quote

Spanky Ham wrote:
If you do a search for Torus screens, then you should find plenty of info on how to build your own.


Yeah, I think that's what I'll have to do. I will wait until I get the Videobeam fixed before I start on that though.
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Mon Oct 02, 2017 3:45 am    Post subject: Reply with quote

I actually got a not-bad-looking test pattern out of the Videobeam tonight, so I guess it's now time to start thinking about the screen more seriously. Smile

And yeah, going forward I think I'll just build a vacuum box torus screen. I tried a test run painting on my flat stretched screen (albeit just with white), and the results are just barely acceptable so I don't think I want to try that on the curved screen, so I guess I will have to get a silver fabric to use. Any opinions on Carl's Silverscreen? The gain is lower than ideal for the Videobeam, but I think it would certainly be much better than what I'm currently using. And I'm thinking I might be better off with that as opposed to something that's not actually intended for use as a projection surface.
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AnalogRocks
Forum Moderator


Joined: 08 Mar 2006
Posts: 24582
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Mon Oct 02, 2017 4:15 am    Post subject: Reply with quote

The company in Korea sells the high gain fabric with or without adhesive on the back. Give me a measurement and I'll get a proper quote. Razz
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Wed Oct 04, 2017 1:51 am    Post subject: Reply with quote

AnalogRocks wrote:
The company in Korea sells the high gain fabric with or without adhesive on the back. Give me a measurement and I'll get a proper quote. Razz


I think I'll build the frame first, then get back to you.

Actually the Videobeam died again yesterday... With the same symptoms as it had with the original failed tripler. Makes me wonder if the replacement tripler model I got either isn't very robust or is too old of new-old-stock so it failed again. I'm actually considering constructing my own tripler with high voltage diodes and capacitors that I will actually know the properties of when I put it together. But I'm currently waiting on a high voltage probe because I think that will be helpful in determining whether I should replace the tripler again or look for a problem elsewhere.
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cmjohnson



Joined: 03 Apr 2006
Posts: 4955
Location: Buried under G90s

TV/Projector: I'm building a projector fort!


PostLink    Posted: Wed Oct 04, 2017 7:51 pm    Post subject: Reply with quote

I'm just trying to understand why you're so dedicated to such a low performance old dinosaur when even far better CRT projectors can
be had for absurdly low prices these days?

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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Wed Oct 04, 2017 9:42 pm    Post subject: Reply with quote

cmjohnson wrote:
I'm just trying to understand why you're so dedicated to such a low performance old dinosaur when even far better CRT projectors can
be had for absurdly low prices these days?


If you have to ask, there is no way of explaining it to you. Razz
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cmjohnson



Joined: 03 Apr 2006
Posts: 4955
Location: Buried under G90s

TV/Projector: I'm building a projector fort!


PostLink    Posted: Thu Oct 05, 2017 1:15 am    Post subject: Reply with quote

Oh, I get the vintage electronics/antiques/collector thing. I just didn't know anybody was into adding the old Advents to that category.
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jmetal88



Joined: 06 Apr 2017
Posts: 37



PostLink    Posted: Thu Oct 05, 2017 1:59 am    Post subject: Reply with quote

cmjohnson wrote:
Oh, I get the vintage electronics/antiques/collector thing. I just didn't know anybody was into adding the old Advents to that category.


Well, I wouldn't see why not. They're super cool-looking and they were pretty much the beginning of home theater. And I got a very good deal on mine ($30), so the bulk of the cost to me has been transporting it from OKC to Wichita and executing repairs on it.
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