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Author Topic: Best projector Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-29-2004 10:02 AM                     Well, ya see there's this foundry about a half block south of our shop on State St. and they make really nice cast iron, brass, or alumnium castings.... really large ones if needed, and....... Mark @ CLACO  |  IP: Logged Joe Schmidt Expert Film Handler Posts: 172 From: Billings, Montana, USA Registered: Apr 2001 posted 02-10-2004 03:28 AM                     My personal favorite combo is Simplex XL mated to RCA 9030 soundhead with the big flywheel on the motor. As to light source, a Cinemecchanica vertical bulb lamphouse with good ventilation can give 20,000 hours plus in lamp life. This I know from actual experience, and do not believe anything else has ever equalled this figure, of course I could be wrong. Now I must go and hide again because the last time I mentioned this in a post John P. was ready to throw a rock at me!  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 02-10-2004 03:45 AM                        quote: As to light source, a Cinemecchanica vertical bulb lamphouse with good ventilation can give 20,000 hours plus in lamp life. Apparently your projectionists have the same problems keeping accurately track of the lamp hours as mine. Some monthly xenon lamp reports I get claim that a xenon lamp has 40,000+h and is still "running fine".  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 02-10-2004 07:13 AM                        20k hours? With good brightness and no flicker? Even if this is the case, I have to ask: why? With 2k bulbs, even if you pull them at 3000 hours (or earlier if they flicker or are dim), the cost per hour isn't that much. I'm sure that the typical theatre owner spends far more per year on incandescent light bulbs (to light the building) than xenons. What's the benefit to running xenons so far beyond warranty hours, especially with the risk of damage to the reflector?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-10-2004 08:55 AM                     We service a chain of theatres that typically gets 10K hours out of their Christie 2kw lamps. Its not my decision to have them do that thats for sure but they have not had an explosion that I am awatr of. I also will not change the lamps with that many hours on them...I insist the managers do it. Glass vitrification is a big deal on lamps with that many hours! Mark  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-10-2004 09:29 AM                     Any lamphouse with a vertically oriented lamp will get longer life than a horizontal operated one. But the quartz still breaks down Also no vertical lamphouse (outside of the ORC styled) will produce a flat light field do to the inverted electrode image As for RCA soundheads they have too much weeve in there scanners for my liking  |  IP: Logged Joe Schmidt Expert Film Handler Posts: 172 From: Billings, Montana, USA Registered: Apr 2001 posted 02-11-2004 01:38 AM                     Responding to Scott N: Yes, @20K no flicker at all. The longer it went on, the more fascinated everyone became. To be objective, however, the light was not as bright, but the screen image was still eminently watchable. No one ever complained. Further, this was not just one Cinemecchanica lamphouse: two side by side in the same booth (a twin.) Hours reported here were per the hour meters. The bulbs were Osrams. Lenses were Schneider. Anticipating an explosion some day, we brought in a set of spare reflectors, just in case, but nothing ever blew up... a continuous run until the twin closed. Mark G: Yeah that's a good idea. Make the stingy managers change the bulb, expecially the ones closest to the executive suites of these outfits. The more of them could be taken out with a bang the better! Gordon M: The two screens both had a perfect picture, even light throughout and no hot spots. A personal belief, I think a weaker light is better working with the quality of Schneider lenses than one which is too "hotly" bright which can give people a headache, including myself. The XL/9030 combo is a screening room preference, but I am an obsolete person back from the exciter lamp / solar cell days combined with custom sound system design incorporating a preamp right in the soundhead. Assuming a clean optical recording on the film, not overmodulated, optical which sounded almost like mag is/was quite doable. [Folks working with archival optical prints, pay attention!] P.S. Do you still play theatre organ? I have begun digital conversion to CD of my large collection of pipe organ LPs, nearly all of which are in pristine mint condition, played only a few times on studio turntables. When I got a new album in I used to dub it onto tape @15ips to enjoy multiple playings but saving the record. Current rig is a Technics studio TT, Audio Technica 16" arm and Shure V15 type 4 cartridge. Transfers are being done with this. There is virtually -0- unmeasurable rumble from the TT, if any is present it is from residual in the master lacquer recording lathe. Would you be willing to listen to some sample CDs? I'd appreciate a critique.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-11-2004 08:33 AM                     The vertical lamphouse has two hot spots as the light pattern is V shaped (i the secondary mirror is installed then there are wo sperimpossed V one inverted. The Zeis Xenosol vertical had a flatter field than cinemecaica's due to the shallower reflector design The RCA soundheads typically had more weave in them than did the SH1000 especially as they aged Yes I still try to get out and play the organ when my copius free time permits  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-11-2004 09:00 AM                     Joe, E-mail me your address and I'll send you a copy of a Pipe Organ CD I did the recording for. Its of the Hinsdale Theatre Pipe Organ which was recently dismantled. I'm glad I did the recording for those guys especially since all 40 plus ranks and the dual consoles have been parted out. George Wright and many others played this organ over its 35 year history. This recording was done primarily with the same mics (Altec M11) that were used to record all the George Wright albums. I ran into the engineer that did those recordings on the internet a number of years ago andhe filled me in on how those recordings were done. _________________________________________________________________ "The RCA soundheads typically had more weave in them than did the SH1000 especially as they aged" Gord, They also have a rediclously high number of parts to them! Mark @ CLACO  |  IP: Logged Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 02-11-2004 07:40 PM                     Somehow one of the oils that Otis Elevator stocks is in my 1014's better than the Strong Simplex oil. I think it's guide rail,door operator or cable lube.  |  IP: Logged

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