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educate me on crt projectors... aka sony 1270...

post #1 of 12
Thread Starter 
I like to tinker with elecs in my spare time.

I just picked up a pair of sony 1270 projectors with av switches for nothing...

Iv used dlp and lcd projectors, but never a crt...
post #2 of 12
Thread Starter 
What should I be looking for when I look at the tubes for ware?

I got 2 pc-1270 AV switches with it, They both have 1 RGB and 3 svideo inputs with spots for another 4 input cards.


What would I need to do to set it up for 1080i?

The only input I will be using on it is VGA from my laptop...
Edited by whitrzac - 4/21/13 at 2:43pm
post #3 of 12
Thread Starter 
I played around with it a bit. I can't seem to download the manual, when I download it, adobe says it's corrupt...
Without a manual I'm in the dark on how to make most of the adjustments...

I'm having an issue getting everything alined, it seems the red/blue tubes are twisted compared to the green... When they are aligned at the center, the top/bottom are off on the red and blue.


PJcalc 1.8 doesn't work with 64bit? Is there a way to set it up for a 72in(horizontail) screen?
post #4 of 12
Are you trying to get the manual off my site? Try one of the other 12XX manuals. I think the 1270 is corrupt, but the others are fine, and short of very minor differences, all 12XX setup manuals are the same.

THIS will tell you most of what you need to know as well:

http://curtpalme.com/CRTPrimer.shtm

Throw distance is 1.4 X the width of the screen. Use PJCalc if you want, but my formula is easier.. smile.gif
post #5 of 12
Thread Starter 
I dug a little deeper into them...

The red/green tubes look nearly new. The green on 1 has a litte ware, but not much.


The blue tubes on both of them are fubared:( They came from a university(or so I'm told) so they probably had white spreadsheets up all day


post #6 of 12
Yup, heavy wear, not well set up. I have a full set of tubes, no wear on the R and G tubes, minimal on the blue, I'd rate it an 8 out of 10, for $80 for the set plus shipping.

When the 1270 tubes get used (my guess is that there's about 6000+ hours on the set, but there's no way to tell since the 1270 has no hour meter on it), they go soft in focus, even if there's no wear on the tube face. I'd replace all three.

I'm out of town for 2 weeks now, but email me at curtpalme at shaw.ca and if you still need them after I get back May 3-4 or so, I'll respond then.
post #7 of 12
Thread Starter 
The plan was to not spend $$$$ on these... I have other hobbies that I spend waaaay to much on:rolleyes: and I have an ok LCD projector right now(epson cinema 200+)

I'm debating weather or not to just scrap them...


Are there any parts worth selling? I have 2 AV switch boxes too and 50+ feet of the "remote" cabling
post #8 of 12
Nope, maybe list them on Craigslist as a freebie? With good tubes, they throw a nice pix, but with toasted tubes, they're not worth anything really. Heck, with good tubes they're not really worth any more than the tubes themselves.
post #9 of 12
Thread Starter 
off to the scrapper they go...
post #10 of 12
Can anyone tell me what the deal is with the high end late model CRT projectors like the Sony G90? You see them on Ebay with claims that they can produce a 1080p image. I have seen some ads that claim it could produce up to a 2160p image. I understand that they are not limited to a fixed number of pixels like Digital projectors and that only bandwidth limits the number of lines. The part I get stuck on, is that they are all 4:3 aspect ratio. I get that with enough bandwidth, they can produce 1080 vertical lines but how does it work when it comes to recreating the 1920 horizontal lines of information on the digital source. Can those lined be any width or is that also limited by bandwidth? I know it's not comparing like with like but asking if the claims of 1080p are genuine seems like a reasonable question.

I hear some people claim that the G90 still outperforms any modern home theater projector. It has been a few years since I saw a CRT projector but I don't remember it being that great. Are those people remembering with rosé tinted glasses or is the G90 that good by today's standards?

They still sell priced as if they were current models. Some are going for $16,000 on ebay. Well, not exactly going but you can't blame the guy for trying. Some people don't realize that the price in 1999 has nothing to do with current value.
post #11 of 12
Quote:
Originally Posted by New Design View Post

Can anyone tell me what the deal is with the high end late model CRT projectors like the Sony G90? I saw a CRT projector but I don't remember it being that great.
What CRT did you see? The difference between a top of the line G90 and an old early 90's set like a Sony 1272 is huge. For comparison, a modern projector like a JVC RS65 will compare well to the G90,outperform it in some ways, not as good in others.
tons of info on the differences,do a search
post #12 of 12
Quote:
Originally Posted by draganm View Post

What CRT did you see? The difference between a top of the line G90 and an old early 90's set like a Sony 1272 is huge. For comparison, a modern projector like a JVC RS65 will compare well to the G90,outperform it in some ways, not as good in others.
tons of info on the differences,do a search

I have done some searches but I couldn't tell if what I was reading was the view of enthusiasts with the rosy memories or something more objective. Most of what I read seems to be extreme views - either they are much better than digital projectors, or they are outdated junk.

I know there is a huge difference between the best and worst examples. The last one I saw was one of the top Runco ones. I forget the model but it was so long ago, that I'm not relying on that reference. I can't even remember what the source material was but I know we have better sources today which would be needed for a fair comparison.

Your reference to the JVC is helpful and you sound like you are being objective.

Can you tell me how they deal with the horizontal detail on a 1920 x 1080 image given that they are 4:3 aspect ratio devices? I would like to know if the 1080 lines they can produce with s 16:9 image is comparable to a native 1080p 16:9 projector or is it closer to one of those 1450 x 1080 projectors? I know the G90 has an input card which allows the use of an HDMI cable.

The other question is: why do people claim that they can produce "real blacks". Given that there is no such thing as black light and CRT's still use light to create the image, don't they have just as much trouble producing blacks on a white screen as modern devices?

On paper, it sounds great. No fixed number of pixels and the ability to add input cards means that a device with enough bandwidth would be future proof in a way that isn't possible with digital. I think I'm missing something though. If I fed it a 2.40:1 Blu Ray with 1920 x 800 dots, what level of detail can I create on an image that needs to fit inside a 4:3 raster? If I get to 800 vertical lines, what stops me having to chop off half the picture from the sides to fit it in?

If you had a G90 and found that you would have to go better than a JVC RS65 today to get better and that you were not even close to exhausting the bandwidth, you might feel like it was a good purchase!
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