today someone in a german forum (thanks deflection) showed me why I had problems with the acpect ratio when doing 4:3 (1,33) simulation rearprojection. For sure I was using full tubeface, but I was not able to achieve a correct aspect ratio in the sceens of a 4:3 screen.
Deflection has measured the tube face of a o7msp tube, and I also checked one a few minutes ago. It is 1:1,086! So not 4:3 (1,33) as expected. I contiuned to measure other tubes, but I was not able to measure a P19 tube, as long as the C-Element is installed in the CRT. So perhaps someone else can add his tubes too:
07ms: ~ 1:1,30 as expected
07msp: 1:1,086 thats a 4,344:4
HDIH 09mh: ~ 1:1,30 as expected
G70 P16lje: ~ 1:1,13 thats a 4,52:4!
Link Posted: Mon Jun 11, 2012 9:25 am Post subject:
Also I would like to add, that a P16 is only as wide (close) as a 7" 07ms! The p16 is higher, but we do not use this with 4:3, 16:9,....
This, plus that the tube is driven harder, might burn modern tubes that fast in 16:9 and scope.
Joined: 28 Sep 2006 Posts: 1448 Location: Fond du Lac, WI
Link Posted: Tue Jun 12, 2012 12:28 pm Post subject:
noos@xp37+ wrote:
Also I would like to add, that a P16 is only as wide (close) as a 7" 07ms! The p16 is higher, but we do not use this with 4:3, 16:9,....
This, plus that the tube is driven harder, might burn modern tubes that fast in 16:9 and scope.
The NEC XGs use the P16LJE tubes, I have not had any problems with their capabilities.... From what I've gathered over the years of reading on here, any G70/XG PJ will likely eat away at the tubes faster than other projectors.
My simple guess for this is that if the P16LJE tubes are indeed about the size of a 7" 07MS then that could explain it, since the electronics in G70s and XGs usually gets driven harder by the owner, because the projector can handle higher resolutions than a 7" PJ, but not nearly as well as a 9" PJ.
I've been using my XG in 16:9 1080p for about 6 months, and before that it was always widescreen 1680x1050 for a good year, I still dont have any wear on my tubes, which leads me to beleive that some people just drive their PJs a lot harder than necessary, or because they want it super bright.
If you properly set the PJ up, you'll probably be fine _________________ If it ain't broke, and you try fixing it without success, don't come crying to me!
TV/Projector: Marquee 9500 Ultra (finally bolted to the ceiling)
Link Posted: Thu Jun 14, 2012 10:18 pm Post subject:
Hi,
I've measured a bare P19LCP:
- Outer glass is 18cm (7.09") x 14cm (5.51") which is 22,81cm (8.97") diagonal
- Inner tubeface is 16cm (6.30") x 12cm (4.72")
- Usable phosphor is 15cm (5.91") x 11cm (4.33")
So usable phosphor is around 1:1.36
These are the measurements from a 180DVB22:
- Outer glass not measurable. Tube in housing
- Inner tubeface is 13cm (5.12") x 10,5cm (4.13")
- Usable phosphor is 12cm (4.72") x 9,5cm (3,74")
Joined: 09 Nov 2008 Posts: 1966 Location: QLD, Australia
Link Posted: Fri Jun 15, 2012 7:10 am Post subject:
I use my XG on 5:4 for all my retro gaming, so that suits me fine the tubes are like that. When i do watch movies, i watch them in whatever the aspect is, and i use my masks to cover the portion of screen not used. Works perfectly fine.
I wouldnt have thought they were as narrow as 07MS tubes, i have 6 of those here and they dont seem to be as wide as the tubes in the XG to me, or even the ones in the plain PG for that matter... I havent measured them though, where as you have. Be interested to see what you get measuring the P16 with no housing on it if you havent done that allready, i know forum member "Aussie Al" has a set of brand new P16s with no housings on them...
Link Posted: Tue Jun 19, 2012 6:23 pm Post subject:
I did measure like barclay did (thanks for P19 and 180DVB!) the usable (white) phosphor. That was easy on a AC tubes, and easy when the G70 C-element is removed.
And right, Nec AC P16 seems to be different. I have just measured a NEC PG xtra P16: ~4,92"(12,5cm)x3,93"(10cm), so it is wider than a G70 tube a better aspect for ht.
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