CurtPalme.com Home Theater Forum

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

I'm looking at a 1252 to keep as a spare/parts machine for my 1272. Same tubes, boards?

Brooklyn · Joined: 17 Sep 2007 Posts: 494 Location: Morgan Hill, CA

Yes. The power supply may be different, if either has the black wires going from the PS to the top of the projector, and the other doesn't. They are otherwise compatible.

ecrabb · Posted: Thu Dec 13, 2007 5:17 pm Post subject:

Same tubes, same basic projector. In my opinion, the only big difference is that the 1252 only has 9-pt. convergence vs. the 1272's 21-pt. convergence - which, won't matter that much if your physical setup is dead-on. 21-point convergence just gives you that extra bit of "tweakability" to really nail things down. My 1271's convergence is almost perfect all over the screen. The 1252 would be a little more difficult (if possible) to get all the way there with.

The 1272 was also rated for higher bandwidth (40 vs 75mhz or somethign), but both are adequate for 1080i. I'm not sure if anybody's ever even nailed down exactly what component(s) would have resulted in lower bandwidth on the 1252 and identified real differences... which leads me to wonder if the 1252 was simply a "down-rated" 1272 without the 21-point convergence card.

SC

EDIT - As the other poster mentioned, the power supply could be different, but that would also be true of two different 1272's.

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

Which lenses is it likely to have? My 1272 has PT-65's but there is a small scratch in one of them.

ecrabb · Posted: Thu Dec 13, 2007 7:43 pm Post subject:

From my observation, there doesn't seem to be any rhyme or reason to which projectors have which lenses. Generally, I think the older machines have the Sony lenses, while the newer machines have the Delta lenses. Of course, your 1272 is an example that disproves that rule. I have a 1272 that has HD-8's on it, and a 1271 with PT-65's. On a 1252 I had, they were HD-8's. Who knows?

Sonynut seems to think there's a pretty big difference between them (PT-65's are great, HD-8's are crap). Personally, I think they're much closer. If were to characterize the difference... If the PT-65's are a 10, then the HD-8's are an 8 or maybe a 9. Maybe his projector was a lot better and revealed more of a difference. Hard to believe, though - mine is damn impressive.

In either case, the lenses are definitely a limiting factor of these projectors. Looking into my PT-65's, I can easily see 1080i scan lines - while they're practically undetectable on the screen.

SC

Sonynut · Joined: 08 Aug 2006 Posts: 367 Location: Bradford,PA

The story with the HD-8 and the Sony 1252/1272 is that once the machines went 2nd generation(ONLY the '52 and '72-extra ground wire from powersupply)), they came equipped with the HD-8 lenses.

Personally I hate the HD-8's, yes. I have another machine here(a 2nd gen 1252) with them on there and see the same thing as before- the HD-8's on thee are much worse than any of my sets of PT-65's. I have another 1272 on the way with the HD-8's. I'll check that oout, but am pretty sure I'll see the same difference. There is definitely a noticeable difference, as Ecrabb said. I guess I am a perfectionist Mr. Green

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

My 1272 has the black wire, and PT-65's. I'm interested in the 1252 for it's lenses and possible tubes later on, one of my lenses is scratched. I can't see it on the screen but every time I look up at it I want the scratch gone. Would the 1252 turn into a 1272 with the boards swapped? Which ones?

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

What would I need to connect these in a stack?

**AnalogRocks** · Posted: Thu Dec 13, 2007 10:26 pm Post subject:

An RGBHV splitter and 3 cables. Somewhere to put the projectors and lot's of patience. Setup the 1252 first as good as possible then make the 1272 conform to it.

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

I'm feeding the 1272 with an HDFury. Won't the rgbhv splitter need to have an amp in it to push signal to both pj's?
They wouldn't be very far apart, but I tried running the fury thru 10 ft of mediocre cable and it sucked.

**AnalogRocks** · Posted: Thu Dec 13, 2007 11:53 pm Post subject:

Ahhh then a good old VGA multiplexer, like those used in computer stores in the days of old to run the same picture on many monitors would do the trick. That and two VGA to RGBHV cables. Your signal line would look like this:

HD-Fury connected to VGA in on multiplexer......VGA out to RGBHV out to 1252
.....................................................................\......VGA out to RGBHV out to 1272

See this ebay add: http://cgi.ebay.com/2way-SVGA-VGA-Splitter-Multiplexer-Duplicator-2-way-Amp_W0QQitemZ300176145222QQihZ020QQcategoryZ41999QQrdZ1QQssPageNameZWD1VQQcmdZViewItem?_trksid=p1638.m118

ecrabb · Posted: Fri Dec 14, 2007 3:45 am Post subject:

I'd look for an Extron high-bandwidth RGBHV distribution amp on fleabay. There, you're talking about a piece of pro video equipment that was probably originally $4-500, not cheap made-in-China crap. The cabling will be a little more expensive perhaps, but the box won't be. Seriously, those cheap VGA splitters will probably molest the signal pretty badly. A nice Extron box will also be of more interest to others later (for resale).

High bandwidth, 75-ohm BNCs...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130182735911

Even better...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200184060866

Or, if you want to stay w/HD15 monitor connrctors...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110205567783

SC

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

Will this work?
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=320190494660&ssPageName=STRK:MEWA:IT&ih=011

ecrabb · Posted: Fri Dec 14, 2007 4:00 pm Post subject:

It would work... but, not to split the signal to two projectors. Wink

That switcher only has one output. You need two outputs.

A matrix switcher with multiple outputs would work, but then you'd be spending a lot more money.

Here's a 4x2 matrix switcher... nice, but probably overkill. 4 inputs.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270196602915

Here's an 8x4 matrix switcher - this is what I have in my rack. Definitely overkill. Wink

I paid a LOT less than that. They usually go for around $300 bucks or so.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250189932439

What I did with mine, is I have both component and RGB sources coming into the switch. I have a Kimcoder RTC2000 plugged into both an input and an output. The RGB sources, and can switch directly to the projector. The component sources come in, a switch the output to the Kimcoder, then the Kimcoders output to the projector. It's sweet.

I'm just waiting for the right weekend to have a buddy come over and I'm going to try a stack for fun, too. I have a spare 1272 and a cable just sitting there waiting... and the switcher is ready to rock and roll. Oh, to have more time...

SC