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Topic: ORC BULBS

Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 06-23-2000 05:41 PM

Somethings wrong with the math the bulb only operates at 25-28 volts so it is difficult to have 58 volts ripple. Infact the output filter cap would have exploded if it had
A possiblity is that there is a piece of nichrome wire that is used a current limiter coupling the boost supply to the output cap
has it been replaced with a piece of regular wire?

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Mark Huff
Film Handler

Posts: 69
From: Springfield, IL, USA
Registered: May 2000

posted 06-24-2000 01:20 PM

I don't know if regular wire has been intalled or not. Our great engineer (Bob Dorsey) the dumb ass has intructed me not to touch the lamphouse any further. He is in a battle with Rentec over this problem. But I can assure you that we had over 50 voltz of ripple. I hate RENTEC.

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Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 06-24-2000 03:50 PM

If you had over 50v of ripple the picture would be strobing on the screen from the beat flicker

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Lance C. McFetridge
Expert Film Handler

Posts: 135
From: Penn Yan, New York
Registered: Jul 99

posted 06-24-2000 04:53 PM

Gord,
Actually #2 has 2080 hours on and not a flicker. And I am looking forward to changing out a couple of bulbs so I can start buying a different brand. Who was it that sold them to me in the first place? Or did Jim just want to get rid of inventory?

lance

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Mark Huff
Film Handler

Posts: 69
From: Springfield, IL, USA
Registered: May 2000

posted 06-24-2000 09:56 PM

Gordon you are correct we did have a flicker and that is why we changed out sevral diodes. I just wish the problem will soon be corrected.

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Randy Stankey
Film God

Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99

posted 06-24-2000 11:20 PM

Our CFS lamphouses always flicker a little but at least. Some do it more than others. I've changed all six diodes in them and there was little to no effect.

The light at Mercyhurst has virtually no flicker at all. It's an ORC lamp, even!

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Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 06-25-2000 02:08 PM

Lance what make of bulb went bang?
I always ask for OSRAM lamps they eat the replacement of the reflector if the bang was a defective lamp.
And no I did spec OSRAM orc was not my choice but the bosses

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Lance C. McFetridge
Expert Film Handler

Posts: 135
From: Penn Yan, New York
Registered: Jul 99

posted 06-25-2000 04:10 PM

Gord,
You know full well that an orc beat up the reflector in #2

Or are you just rubbing it in a little? My projectionist stayed in the bathroom for a long time while I changed out the lamp. He did mention that it sounded like a shotgun going off as he stood next to it. Anyway, just as soon as I use up these last two lamps I have in the box, I am changing brands, and you can swing down and help me refocus a new reflector.

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Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 06-25-2000 06:46 PM

Lance I don't need the excuse to refocus the reflector to swing bye your theatre
It is a tribute to this industry that it is one of the few theatres that I go to that is always SPOTLESSLY clean and every thing is almost smack on
Kepp it up and I will be out of work
Gord

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Mark DeLettera
Film Handler

Posts: 54
From: Venice, Florida
Registered: Aug 1999

posted 06-27-2000 10:12 AM

Lance,
We met last year at the Entertainment Equipment seminar in Buffalo. Now that I am living weekends and vacation days at our cottage on Keuka Lake this summer, I will have to make it a point to stop by and check out your theatre that Gordy speaks so highly of. A few of my neighbors have told me similar comments.
When we get another rainy or cool weekend day, (and the way it has been going, I'm sure we are in for many more), I will definately stop and visit. (Who knows, maybe I can get that Pytlak guy to stop by also, possibly by way of a Kodak (workday) field trip!)

Mark D.
Eastman Kodak Co.

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Art Averett
Film Handler

Posts: 14
From: Orlando, FL
Registered: Mar 2000

posted 06-27-2000 10:15 AM

Here at WDW we use both OSRAM and ORC. I'm at the studios and also use Rentec consoles, that hold the lamp vertically. Usage is from 2KW lamps to 7KW lamps. We also use Strong Super Lum-x that use 2KW OSRAM lamps. We normally get about almost up to 800 to 1000 hours of usage on a 7KW ORC lamp. The 7KW lamps are only warranted up to 500 hours. Anything after that you are on your own. We also check our power supplies once a year and replace the electrolytics as to insure steady DC to the lamps. All of our lamps are constantly running any where from 12 to 14 hours a day constantly, with no shutdowns. Yes we get an occasional lamp exploding, taking a reflector with it. On the Rentec lamphouses, CHECK ALL CONNECTIONS FROM THE POWER SUPPLY TO THE LAMP. Rentec has lousy quality control (or none). Every Rentec we have received, we have tightened loose wiring on all electrical connections. Check DC current going to the lamp with a clamp-on DC ammeter. On the vertical consoles, (RENTEC) check the angle of the mirror with a protractor. It should be at a 45 degree angle. I have seen brand new OSRAM lamps explode inside of their protective covers. Good luck, Art

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 06-27-2000 11:35 AM

Art:

I visited the "behind the scenes" projection facilities at Walt Disney World (WDW) in September 1992. At the time, we were hosted by Tom Jozwiak and Bob Ray. I know Bob has retired and is now with Atlas Lighting (saw him at several recent trade shows). Is Tom still there?

Might be interesting to the readers of Film-Tech to know the projection equipment used for some of the major attractions at WDW. I recall there were lots of modified Ballantyne projectors used for 35mm applications. Even then, WDW used 100% ESTAR base print film, and was getting thousands of flawless plays, thanks to the care taken and on-line film cleaning.

How about an update?

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 06-27-2000 04:08 PM

Yes John, you're right!
But those Ballantynes also have the solid Starwheel shaft(known as the Disney Star instead of the star with the coupler. That makes em allot more reliable.
Mark

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Mike Jones
Expert Film Handler

Posts: 108
From: Birmingham, MI, USA
Registered: Jul 2000

posted 07-06-2000 06:27 PM

listen, ORC bulbs are the worst bulbs ever! We had maybe 10 orc bulbs that never came anywhere close to 2,000 hours. They all died long before and we just kept getting replacements. If you know what the hell you're doing, you should not use ORC bulbs!

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