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This topic comprises 2 pages: 1 2
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Author
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Topic: Warbling with Analog Cyan Dye Reader
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Ian Woloschin
Film Handler
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Posts: 54
From: Worcester, MA, USA
Registered: Mar 2006
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posted 05-02-2006 09:31 AM
Ok, so I'm new here. Yay for me finding a place that might be able to fix this problem .
wI'm the "Head Projectionist" for my university's 35/70mm projection program. Basically, I made the mistake of getting licensed (yay Mass.!) and now I'm responsible for two DP70 projectors (single screen, we don't have the money for platters). This is all hooked into a stock CP55 which then sends the channels to both booth speakers and house speakers.
Last October we updated our projectors with new sound readers, so we could show cyan dye tracks.
http://www.kinotonamerica.com/cinemaEquipment/dp70.asp
On one of my projectors (P2) the sound gets all warbly every now and then. When I use my finger to push the film laterally over the light source it seems to get a little better, but it could just be me. It's very intermmitant, it'll be there for the first reel of a movie, but the third reel it's gone.
We do plan for next summer (2007) to do a full upgrade to the lecture hall/theater, including switching to Dolby Digital, but until then I'd like to figure out why we're having this warbling issue.
Since I am a student, I'm actually going home for the summer (4 hours away), so I may not be able to try any ideas immediately, but the old Head Projectionist who graduated will be around to try and fix things.
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Michael Schaffer
"Where is the Boardwalk Hotel?"
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Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 05-03-2006 11:19 PM
Well, we can't really judge and appreciate these readers unless we use them to play the sound back through the Panastereo processors. Us people who use inferior products such as the ones made by Dolby and some other manufacturers don't really know what we are talking about anyway. BTW, when did you have that bad batch? I seem to recall we had some probs with the O-rings in 1999 or so, but not for long and never afterwards. Even that was never perceived as a real problem by us, it took less than a minute to change them, done, problem solved.
BTW, Ian - the pressure with with the roller presses against the sound drum should be around 300g. You can check that easily with one of those pull thingies, I don't know what they are called in English, spring balance I think. That's probably not your issue here, but it might be good to know.
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 05-04-2006 06:42 AM
quote: Mark Gulbrandsen Where in my above post did I criticize its SRD playback? What I did criticize was its vastly inferior "tin can" construction quality.
It is actually of a superior construction quality than the rest. It is very precise in its alignment of the film to the reader, very precise in its alignment of the readers to the LEDs...in short, very precise. At least CE realized that they needed to make new mounts to get things to align in their retros (they don't make any for Kinoton). The proof is in the reproduction...the current RSSD out performs all others at the moment. It does so well on digital because of this...as such it does well on analog too (analog is an easier track to scan). You are truely judging a book by its cover...er tin can. Which, by the way covers up their, otherwise, exposed reader boards.
To say that you wouldn't take one even if for free is your loss.
BTW Mike....I have those tin can readers of Kinoton playing through Panastereo processors in such shabby places like the American Film Institute, National Archives, National Gallery of Art and no one felt like they had a crapola analog film reader...even with the precise Panastereo tracking.
As for the O-rings...our bad batch came in 2003 or there abouts...they would not last very long at all. About 1000-hours or LESS and then pucker up to the point of worthlessness. Note, only the O-ring under pressure would pucker (inboard). Switching to the green O-rings has had the problem go away permanently. Also, our black O-rings going back to about 2000 have had zero problems. [ 05-05-2006, 08:51 AM: Message edited by: Steve Guttag ]
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