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This topic comprises 3 pages: 1 2 3
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Topic: Optical sound technology
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 02-10-2002 10:40 AM
Mark,Did you make your reverse scan reader for the DP-75 as well? I know about the AAII version. BTW, Steve K, the statement about the red LED being less of a service issue than the exciter lamp is not entirely true, especially not for all red LEDs...since they fade over time, they are constantly needing adjustment to ensure Dolby-Level. Also the LEDs often require a technician with suitable test equipment to install whereas the exciter lamp is changable by regular booth personell . Steve ------------------
"Old projectionists never die, they just changeover!"
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Pete Naples
Phenomenal Film Handler
Posts: 1565
From: Dunfermline, Scotland
Registered: Feb 2001
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posted 02-10-2002 11:50 AM
I've got some Jax lights here, four to be exact. 2 on a pair of DP70's and 2 on a pair of DP75's in the same cinema. It's interesting to compare the results between the two. On the DP70 the results are not at all bad, the being a projected image sound head the results are good to begin with, and as the cell is miles away from any stray light, the noise doesn't seem to be much od an issue. However on the DP75, totally different story. The guys can't have any lights on in the booth while running analogue, and we've had to become inventive with bits of cardboard to shield the cell from light reflected off the port glass.Walter Voight produces a version of his ACL for the DP70, which I am told gives stonking results, althoug I've not personally seen it. On the DP75 or FP20 it gives stonking results but can be a real pig to align, but it's worth the effort for the performance gained over tungsten or Jaxlight. Gordon you are so right! FP20 / DP75 lamps seem to be the worst offenders, put it in, take it out, bend the flange, put it in, take it out, bend the flange some more........
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Tom Fermanian
Expert Film Handler
Posts: 101
From: Sainte Adele, Quebec, Canada
Registered: Dec 2001
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posted 02-10-2002 07:52 PM
JAXLITES for DP75s, yeah we know about them, we where the 1st one to purchase them, We found out about the stray light problem, Before, with no pre-amp and tungsten, NO PROBLEM, Now with LED and Pre Amp, Problems, These particular projectors have a full plexiglass door allowing light to seep in .So we built 2 metal cover in our shop, put one on machine, it worked, sent one down to ULTRA, they liked it and put it in production.
Again, cheapskates? well to your US Dollar, our Canadian Peso at 60cents "US" gives us the chance to pay 40cents more on each dollar for equipement bought outside Canada,(+ import,transport ,brokerage) you guys do the math?  ------------------
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