CurtPalme.com Home Theater Forum

belwa68 · Joined: 15 Oct 2010 Posts: 15 Location: italia varese

Hello to you all of the forum, my name is Walter, I write from Italy.

Are in possession of a beautiful marquee "8500 AC" with new tubes, I wanted to know if you can being converted into LC and what to do. Confused

Thank you in advance. Laughing

Walter

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

Hello

Yes it can be done, it is not inexpensive. You would need: New metal plates, one is below the tubes and the tubes bolt to it, another plate goes above the tubes. And new eight inch or nine inch LC tubes in LC mounting hardware, with LC plastic covers. The 8500 yokes can be re-used. You would need HD-10-series lenses for the LC tubes. HD10-GT17s are very popular for seven or eight foot screen width. The LC tubes need more throw distance, so the projector would be farther from your screen.

.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Many people have done this. I've done it once and I'm almost ready to do it a second time.

However, what Tim says about throw distance is true but not always. When I converted my 8500 to a 9500LC, my screen size and
location remained the same. My throw distance remained the same. My picture size remained the same. The small difference in
throw ratio could be made up for by maximizing the raster size on the 9" CRTs. Which is what you want to do anyway.

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Well, it makes total sense. The 8" LC assembly has a smaller phosphor area than the 9" LC assembly. So, the picture coming through
the lens is smaller. Assuming that both assemblies use the same kind of lens, then you will see that for a given throw distance, the
picture coming from the 8" LC assembly must be smaller than the picture coming from the 9" LC assembly.

The difference between an 8" AC....AC..... assembly and a 9" LC assembly is very minor, though. It can usually be compensate for quite easily
in setup. A few points in screen width and height covers it.

belwa68 · Joined: 15 Oct 2010 Posts: 15 Location: italia varese

thanks guys ..! You were very kind in answering me immediately .. Mr. Green

the shot of the lenses is not a problem, move back to the projector.
I wanted to ask is: can I use the same tubes?

in this case I'll 'need to build a new metal plate, buy 3 boxes for "LC" and 3 "HD10 GT 17" lenses

is that correct? Question

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Trying to use the same tubes is not impossible but it's really not practical. You'd have to pull the 8" air coupled tube out of its cooling cell,
without breaking it, obtain the 8" LC assemblies, which are not common, and pot them into them.

CJ

nuttall_chris · Posted: Thu Dec 16, 2010 3:16 pm Post subject:

belwa68 · Joined: 15 Oct 2010 Posts: 15 Location: italia varese

thanks guys,

you gave me good advice. Thumbs Up

while looking for parts to turn my "AC to LC 8500" I found a "9500LC ultra" a little money with moome card v2 installed Mr. Green

I just have to replace the tube because of the green is worn, but all the rest works perfectly.

I warmly thank all of you.
I send a cordial greeting Very Happy

Merry Christmas.
pass it peacefully with many beautiful views.

I now need a new tube of green Neutral