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RaWsHaRk
Joined: 01 May 2009
Posts: 131
Location: Finland
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| Posted: Sat Aug 13, 2011 5:18 pm Post subject: |
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an 8900? cool! let me guess, there is no wife of gf`? or they are more understanding over there than in scandinavia...
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Electrohome Marquee 7500.
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mc86
Joined: 20 Sep 2008
Posts: 767
Location: pittsburgh, pa
TV/Projector: ECP 4500 (Vidikron box), ECP4500+, wanting 07MS/07MTS, evaluating pc soft-blend
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| Posted: Mon Aug 15, 2011 3:08 am Post subject: |
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I think maybe they have spliced together some sort of GF made from a the original wife, a dyson vacuum, a bag of ballistics gel, and an extra HVPS. Whatever it does and however it works, I'd bet it is awesome. I gotta not post after a triple scotch...
Matt
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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: Mon Aug 15, 2011 3:46 am Post subject: |
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| mc86 wrote: | I gotta not post after a triple scotch...
Matt |
Matt, feel free to post after a triple scotch. I like to post after triple rum n cokes 
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Tech support for nothing
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GeorgeSong
Joined: 31 Oct 2008
Posts: 74
Location: Canton,China
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| Posted: Sun Feb 26, 2012 8:45 am Post subject: |
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another one
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sun Feb 26, 2012 12:35 pm Post subject: |
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NEC tubes eh? What do they come out of??
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GeorgeSong
Joined: 31 Oct 2008
Posts: 74
Location: Canton,China
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| Posted: Sun Feb 26, 2012 12:40 pm Post subject: |
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| CasetheCorvetteman wrote: | | NEC tubes eh? What do they come out of?? |
NEC GP-5000
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sun Feb 26, 2012 12:45 pm Post subject: |
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Is it sharp enough to resolve 1080p?  These old NECs aren't famous from their sharpness... and the GP5000 is also said to be really dim, what about that?
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sun Feb 26, 2012 12:51 pm Post subject: |
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Oh ok, havent ever seen one before.
Gjaky, id say its more so the rest of the projector that makes the image so soft on them more so than their tubes, they are EM focus, so with the right magnetics they should be able to get a pretty good spot size...
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GeorgeSong
Joined: 31 Oct 2008
Posts: 74
Location: Canton,China
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| Posted: Sun Feb 26, 2012 1:02 pm Post subject: |
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| gjaky wrote: | | Is it sharp enough to resolve 1080p? These old NECs aren't famous from their sharpness... and the GP5000 is also said to be really dim, what about that? |
the key is not the NECs tube, but the EH8500's powerful force
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Feb 27, 2012 6:47 am Post subject: |
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Tell me George, what is to stop someone from getting a tube rebuilder to rebuild some 13 inch monochrome tubes, re coating the phosphor, and then putting on a longer neck and a different gun, then using them for projection?
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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: Mon Feb 27, 2012 7:42 am Post subject: |
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| CasetheCorvetteman wrote: | | Tell me George, what is to stop someone from getting a tube rebuilder to rebuild some 13 inch monochrome tubes, re coating the phosphor, and then putting on a longer neck and a different gun, then using them for projection? |
the lenses
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Feb 27, 2012 9:08 am Post subject: |
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| AnalogRocks wrote: |
the lenses |
Bullsh**, move the barstards further away from the tubes!! Make some bloody lenses!!
| gjaky wrote: | the money  |
Money is no object, that never stops anyone!!
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Feb 27, 2012 9:24 am Post subject: |
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Well, I think thing is not that easy as you described, because what you suggested it would require a desing of a new construction. I don't think the available tubes are just the outcome of some random construction.
Ok here are my definitive querys:
1.) old 13" monochrome tubes are designed to operate at around 16kV anode voltage, but a modern projection tube needs to stand about 34kV, it is double tension...
2.) direct view tubes have thick front glass to avoid accidental breaking. As known the projection tubes working on very high brightness, with strong electron beam which can melt the glass, but the glass is very bad heat conductor, so if you have high beam current on a thick glass it can locally melt the tubeface because the thick glass insulates the cooling liquid.
3.)tubeface is domed not flat.
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Feb 27, 2012 9:34 am Post subject: |
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I know all this mate yes.
However, the domed tube face will not make a whole lot of difference.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Feb 27, 2012 9:47 am Post subject: |
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| CasetheCorvetteman wrote: | I know all this mate yes.
However, the domed tube face will not make a whole lot of difference. |
Why not? if you thinking in LC it can totally mess up the optics, you'd get a double concave lens az first element which difusses the light but you want to pull back the lens to use it, it is a total light loss.
Oh and did not mention that due to big tubeface you'd need greater deflection current which would affect the spot size more than with the 7-9" tubes, so the overall performance is also problematic.
But you have the idea, money doesn't matters, do it, I'll be interested in your results.
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Feb 27, 2012 10:19 am Post subject: |
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I dont have the equipment to do it, nor the time, or space, or the technical know-how to do that sort of mod to a tube. Id give it a go if i did and could.
If spot size was an issue, why did Barco make at least 2 different models of 12 inch sets? Panasonic also made one as well. If they both did it, why do you sugest it cant be effectively done?
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Feb 27, 2012 10:34 am Post subject: |
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Curt, and some other forum members saw the 12" barco in person during action, and all of them reported that it looked softer than a decent 9" set. But it is undoubted that 12" barco has much more brightness than any other set, but that's all.
Honestly if you expect a resolution gain of 12" tube over a 9" like 4K HD, then you'd face the problem that even the barco 909's lacks the bandwidth to resolve that fully. So if you'd have the ultimate tube then no electronics to drive it.
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Feb 27, 2012 12:51 pm Post subject: |
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WHICH 12 inch though? There is 2, and one is SUBSTANTIALLY better than the other.
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