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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Mon Apr 26, 2010 10:11 pm Post subject: |
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| garyfritz wrote: | Paul, it's not an LC. *All* AC projectors (that I know of anyway) have a glycol chamber in front of the tube to help disperse heat off the tube face. What you see when you pull the lenses is NOT the front of the tube, but the glass on the front of the glycol chamber.
Because the glycol chamber has a uniform thickness (unlike LC chambers), you can tint the glycol to color-filter the set without special lenses or LC C-elements. If the tinting was done properly and the glycol is still OK, then as far as I know it's just as good a solution as color-filtered lenses. Some projectors (Barco??) do ALL their color-filtering that way.
Anyway, back to 8500's. Since the glycol is tinted, this must be an AC set. HD144's won't go on that projector without Joust mods or similar.
That said, there ARE 8500LC's. They're not common but they do exist. As Tom says, LC's take different lenses so they wouldn't work with HD144's. |
Ah, your right. I just had a look at my 8500 tubes that I pulled out of my machine. They do have a flat chamber in front of the tube face. I don't see any fill locations though, so not sure if it's even possible to change that glycol? I would start there, because if it's not, that will dictate that you get clear lenses. I know I've never seen it in any manual or procedure.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Mon Apr 26, 2010 11:25 pm Post subject: |
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If I remember right, 8500 tubes have a screw on the top of the glycol chamber. You can open the screw (with the projector or at least the tube right-side-up!), suck out the old glycol, and replace it with new. http://www.curtpalme.com/Bleeding_CRT_Tubes1.shtm has some tips on opening the glycol chamber to drain off excess pressure, and http://www.curtpalme.com/Tinting_Glycol1.shtm talks a bit about DIY tinted glycol.
If it was me, though, I'd leave tinted glycol alone unless you've checked it and found the glycol has deteriorated and is affecting your colors. Clear HD144's will get you better focus than the HD8's but it's not a night-and-day difference. With the cost of getting the tubes (the shipping to Europe is nasty) and the cost of the Joust mods, it just wouldn't be worth it to me.
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David_Web
Joined: 02 May 2007
Posts: 418
Location: Sweden
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| Posted: Tue Apr 27, 2010 8:19 am Post subject: |
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I would keep the colored glycol as it might reduce halos due to the light having to pass through the filter thrice (if it's a direct reflection) and all the way through a thick layer if it's out to the side.
I would definitively find clear lenses to put on. I think Curt had some cheap, not sure if he have any left. Halos are almost gone for me.
And don't forget to bleed the tube if you haven't done so. you don't want it to crack. Save the colored glycol into separate containers just in case you need it later. It won't be much but still.
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Tue Apr 27, 2010 11:47 pm Post subject: |
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I'd try both coloured glycol and filtered lenses.
A filter is a filter. Stacking them may reduce output, but it will not "over saturate" the colours.
They simply let certain wavelengths through, and block others.
If both sets of filters overlap, them I think the loss of output would be minor.
But if they are different enough, then the loss will be major.
But I'd still try it. Worst case is you have to replace the coloured glycol with clear.
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CZ Eddie
Joined: 23 Mar 2006
Posts: 1601
Location: Austin, TX
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| Posted: Wed Apr 28, 2010 4:14 am Post subject: |
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| roland@b4 wrote: | | I would have thought clear glycol and colour filtered lenses would give the better result. |
It does. But colored glycol has been an inexpensive trick to use for color correction long since before the widespread knowledge that you could adapt the HD-144/145 to an AC Marquee machine.
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CZ Eddie
Joined: 23 Mar 2006
Posts: 1601
Location: Austin, TX
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| Posted: Wed Apr 28, 2010 4:16 am Post subject: |
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| garyfritz wrote: |
Clear HD144's will get you better focus than the HD8's but it's not a night-and-day difference. |
Have you compared them, Gary? How wide was the screen you tried it on?
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roland@b4
Joined: 07 Jul 2009
Posts: 82
Location: Reading UK
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| Posted: Wed Apr 28, 2010 9:19 am Post subject: |
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The only suggestion not given yet is clear Glycol and clear lenses. 
Why is the filtered glycol Magenta and Cyan
yet the lens filter red and green.
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Wed Apr 28, 2010 12:40 pm Post subject: |
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Before I converted my 8500 (98 build) to a 9500LC, I made the conversion fromHD8 lenses to HD-144s that are color filtered. I saw a big difference in corner focus. WIth the HD8s, you could draw a circle in the center of a 16:9 screen, and within that circle I had nice focus, but outside of it, it was not good. Most prevelant if you use a HTPC. After installing the HD-144s, That circle went away, and I had nice focus all the way across. Not super tight focus, but as good as it gets for stock 8" tubes and stock Marquee magnetics.
I would take color filtered HD-144/145 lenses over stock HD8s and tinted glycol for sure. By far the best mod you can do for an 8" machine that uses HD8s. Now, I don't have experience past HD8 based 98 vintage lenses, so not sure how HD-144/145s compare to later model HD8s.
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Last edited by Sparky015 on Wed Apr 28, 2010 1:27 pm; edited 1 time in total
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CZ Eddie
Joined: 23 Mar 2006
Posts: 1601
Location: Austin, TX
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| Posted: Wed Apr 28, 2010 1:08 pm Post subject: |
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How wide was your screen?
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Wed Apr 28, 2010 1:24 pm Post subject: |
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110" diag. 16:9
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Wed Apr 28, 2010 1:25 pm Post subject: |
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96X54 inches I think, without doing math.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Wed Apr 28, 2010 2:02 pm Post subject: |
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| CZ Eddie wrote: | | garyfritz wrote: |
Clear HD144's will get you better focus than the HD8's but it's not a night-and-day difference. |
Have you compared them, Gary? How wide was the screen you tried it on? |
Yes, I switched from HD8's to HD144's. My screen is 85" wide, about 98" diagonal.
I have focus issues with my 8500 so maybe I'm not the best test case, but I didn't notice a huge improvement. It was better, yes, but not hugely. The difference in colors, however, WAS huge.
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adariusbelly
Joined: 13 May 2010
Posts: 2
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| Posted: Thu May 13, 2010 9:17 am Post subject: |
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At least a picture of an installed 144 on its plate would be helpful, too. I am using HD-144 color filtered and color corrected lenses on my BD701s,and the sharpness and colors are better than the HD-145 lenses the HD-145 lenses that i have are not color filtered.
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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: Thu May 13, 2010 3:34 pm Post subject: |
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| adariusbelly wrote: | | At least a picture of an installed 144 on its plate would be helpful, too. I am using HD-144 color filtered and color corrected lenses on my BD701s,and the sharpness and colors are better than the HD-145 lenses the HD-145 lenses that i have are not color filtered. |
how long have you been into CRT?
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