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Author
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Topic: Conversion - Christie CH20, CK20 to 25
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Steve Kathan
Film Handler
Posts: 1
From: North Highlands, CA, USA
Registered: Aug 2001
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posted 11-16-2001 09:22 PM
I'm wondering if anyone has any experience converting Chistie CH's or CK's (we have both) 20's to use a CXL25 bulb. We have several in theatres less than a year old. We have already put Phoenix kits or Strong reflectors in the "CH's" and Xetron reflectors in the "CK's". This has doubled and in some cases tripled the light. We have large screens with top movable masking, our formula for computing lamp size did not take this into account. We use new Schneider lens, have optical clear port glass, 90 degree shutters, and properly aligned lamphouses. We've tried just about everything we can think of but we are still only hitting 6 to 9 footlamberts on flat and 10 to 14 on scope. Trying a larger bulb is one of the few options we have not yet tried. It appears I can get between 90 and 95 amps out of the power supplies which is pretty close to what I need. It looks like I will need a 20mm spacer on the rear bulb support in order to move the bulb back into the reflector and perhaps a larger shield on the front of the bulb to accomodate the larger diameter of the bulb, can anyone think of anything else? I will check for adequate exhaust and add more if needed. It does not appear that there is enough room in the Phoenix kit plenum to pull the bulb back into focus although the instructions indicate it will handle a 2500 watt bulb.? Is this also true for the "CK". If any of you have any thoughts on this I could sure use some help. One last thing, I wonder if a high speed intermittent and a smaller shutter would help, I've read that Kodak has come up with a way of converting a normal (in this case Century) intermittent to a high speed intermittent, any info on that? Price? Availability? Thanks in advance, Steve Kathan.
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John Pytlak
Film God
![](http://www.film-tech.com/ubbmembers/331cap.gif)
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 11-16-2001 09:33 PM
The improved "quicker" intermittent and more efficient modular lamphouse developed by Kodak are the subject of a technical paper in this month's SMPTE Journal - Design Improvements for Motion Picture Film Projectors, C. L. DuMont, A.F. Kurtz, B. D. Silverstein, and D. H. Kirkpatrick, Eastman Kodak Co., Rochester, NY. Kodak is negotiating with several equipment manufacturers to commercialize these inventions. They are not yet on the market, although prototypes are operating at some sites. http://smpte2001.iconvention.com/V25/index.cvn?id=10004&p_navID=12 ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Research Labs, Building 69, Room 7525A Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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