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Author Topic: Best Bulbs? Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 10-15-2001 07:34 PM                     When I left the Chinese, there were still a couple of bulbs that had never been changed. They were over 8500 hours and still looked good. Who knows when (of if) they have been changed. Maybe they ran another 6 months, maybe they exploded that next week. I don't know anyone that is still working there. The projection staff did a full turn-over.  |  IP: Logged Don Sneed Master Film Handler Posts: 451 From: Texas City, TX, USA Registered: Aug 2001 posted 10-16-2001 01:55 AM                        It's been several years ago, in fact it was 1981, I installed a Orcon II console at an old single theatre in west Texas that only show one movie a week on Saturday night, I was laughing then that it would take 16 years before the warranty ran out...I don't know if the theatre is still operating or not, but it was the first time I ever saw a non-magnet speaker, it had a magnetic field generating it on the rear wall behind the screen, power by a 6-foot tall, 1936 (year date) RCA ampilifier & was still working.....Two month later they were upgraded to.....Solid State "MONO", a new speaker, and of course a mono solar cell....  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 10-16-2001 09:02 AM                     Don: FYI, that "speaker without a magnet" is called a field coil--just an electromagnet instead of an alnico or ferrite "permanent" magnet (not that they're so permanent in a lot of old VOT's where they do get tired and lose magnetism). Not too surprising that the old RCA amp from 1936 was still working, too. Originally those amps were leased by RCA or WE with service rather than sold to the theaters (just as the production equipment was only leased to the studios), and even then nobody liked paying for a tech, so they were literally rated at hundreds of thousands of hours before failure.  |  IP: Logged Don Sneed Master Film Handler Posts: 451 From: Texas City, TX, USA Registered: Aug 2001 posted 10-16-2001 10:14 AM                        Hey Jeff, that's the word I was looking for "Electromaget",I just started as a tech back then, I was still green or wet behind the ears, the engineer in charge told me to align the PEC cell (no solar cell), when I connected the volt/ohm meter to the speaker output & ran 9khz test film,I discovered a 90vdc on the speaker output of the amp, I told the tech about this & he tripped out, told me to see where the voltage was coming from, that will burn up the speaker voice coil, just as I was about to cut the voltage wire to troubleshoot the output of the amp, the engineer came running to the booth, screeming "don't do anything, this is an electromagnet speaker, it needs that voltage to operate"...when I went to see the woofer it was just like looking at a today woofer speaker without the magnet, there was a large coil mounted on the wall behind the screen, the horn was something to see, it was the largest damn thing I ever seen to this day, it appear to be in the shape of a Ram's(animal) horn, and then some, I still haven't seen or figure that one out yet & it's been 20 years ago since I seen anything like that, I should have kept that horn when we replaced the speaker system, but then I would not had a place to park my car in the garage due to the size if the horn.....I am so glad I work in today times instead of in the 30's, at age 47 I couldn't even lift those monster horns, but I got to admitt, they did sound good for their age.....  |  IP: Logged Robert Golding Film Handler Posts: 65 From: Sutter, CA, USA Registered: Jan 2001 posted 10-17-2001 03:26 AM                     I've tried many different types of lamps in my X60D strong and have found that Christie bulbs are the only way to go. I average 3500 to 4000 hrs with a 4500 watt bulb. As for ORC's, as far as I'm concerned they are the worst out there. I personally have not tried any of the chinese bulb as they scare me.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-17-2001 01:11 PM                     Ditto on the Christie/Ushio bulbs for us. Never a failure on them, only life spans way past their rating. Mark @ GTS  |  IP: Logged

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