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Author Topic: Motigraph and reverse scan?
Derek Maxwell
Film Handler

Posts: 87
From: Ohio
Registered: Nov 1999


 - posted 02-14-2001 10:13 PM      Profile for Derek Maxwell   Author's Homepage   Email Derek Maxwell   Send New Private Message       Edit/Delete Post 
Does anybody know if it is possible to convert old Motigraph soundheads to Reverse scan pickup? If so, where can I get them and how much do they usually run per head? Thanks.
http://www.drive-infilm.com

John Eickhof
Jedi Master Film Handler

Posts: 587
From: Wendell, ID USA
Registered: Jan 2000


 - posted 02-14-2001 10:51 PM      Profile for John Eickhof   Author's Homepage   Email John Eickhof   Send New Private Message       Edit/Delete Post 
I am afraid to the best of my knowlege,at this time no one is making a reverse scan conversion that will fit the Motio SH-7500
There are several problems in the physical design of the Motio that will make a reverse scan unit difficult to make as well as install, #1] The way the LED would have to mount, there is too little room for a decent array, #2] There is no way to install a pick-up assy with lens & circuit board the way the exciter lamp compartment is designed.
The only option presently available is the JAX-LITE from Ultra Stereo. I would suggest upgrading soundheads, as the Motios are getting expensive as far as parts go and their stability is nominal, and they are famous for the sound flywheel 'drying out' inside thus resulting in excessive wow & flutter.

------------------
John Eickhof President, Chief Slave
Northwest Theatre Equipment Co., Inc.
P.O.Box 258
Wendell, ID. 83355-0258
208-536-5489
email: jeickhof@nteequip.com

Darryl Spicer
Film God

Posts: 3250
From: Lexington, KY, USA
Registered: Dec 2000


 - posted 02-14-2001 11:21 PM      Profile for Darryl Spicer     Send New Private Message       Edit/Delete Post 
You don't want that flywheel to dry out and get to the point that it begins dragging. It will cause scratches on the film. The jaxlites are a good option. Be aware you may have to do some grounding to the exciter supply, do to hum in the sound. You do not have this problem with reverse scans since they usualy use there own power supply. Also if you have an lED failure you can replace the jaxlight and have the show back on screen. You can't do that with reverse scan. Unless you have digital capability you are screwed until you can replace the lED. I have already experienced this with the prototype Component Engeneering unit that I am using. We have DTS in that auditorium so I could keep the shows going.

John Eickhof
Jedi Master Film Handler

Posts: 587
From: Wendell, ID USA
Registered: Jan 2000


 - posted 02-14-2001 11:25 PM      Profile for John Eickhof   Author's Homepage   Email John Eickhof   Send New Private Message       Edit/Delete Post 
I forgot to mention that it is difficult to install the JAX LITE too! You will have to grind the casting out where the exciter drops into the socket to clear the JAX LITE base, (This is also true for the Century R-2 & R-6 soundheads) But, the JAX LITE will perform great! And watch the ground wires as darryl mentioned! You may have to attach both ends of the foils shield drain wire on you cell cable to eliminate hum! It takes a little experimentation depending on your processor.

------------------
John Eickhof President, Chief Slave
Northwest Theatre Equipment Co., Inc.
P.O.Box 258
Wendell, ID. 83355-0258
208-536-5489
email: jeickhof@nteequip.com

Derek Maxwell
Film Handler

Posts: 87
From: Ohio
Registered: Nov 1999


 - posted 02-14-2001 11:58 PM      Profile for Derek Maxwell   Author's Homepage   Email Derek Maxwell   Send New Private Message       Edit/Delete Post 
Where is the Jax-lite available and what does it run?

John Pytlak
Film God

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


 - posted 02-15-2001 07:09 AM      Profile for John Pytlak   Author's Homepage   Email John Pytlak   Send New Private Message       Edit/Delete Post 
The JAXLIGHT is made by Ultra Stereo Labs. Information is on their website:
http://www.uslinc.com/

Most theatre equipment dealers can obtain them for you.

Although JAXLIGHTS do use red LEDs, and so will be compatible with cyan dye tracks, they do not have all the advantages of upgrading to a complete reverse scan red LED reader. Efficient noise reduction (e.g., Dolby SR) is still needed too.

------------------
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 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

Mark Gulbrandsen
Resident Trollmaster

Posts: 16269
From: Bountiful, Utah
Registered: Jun 99


 - posted 02-15-2001 08:38 AM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
Derek,
Indeed, Kelmar does make a retrofit reverse scan for the Motiograph. I can't remember the Part number off the top of my head as its too early in the morning and I'm not in the office today to look it up.
I have installed and sold quite a few of them and they work great and are as easy as a regular scanner to install. If you check out the pictures of Century Cinema 5 on our web site, you will see a 5 plex full of Motiographs. These all have the Kelmar reverse scan kits in them. They are not always available "off the shelf" from them but they always have delivered them in a decent time frame. Call or e-mail me and I will be glad to give you and any Film-Techer here a cost plus price on these and any other fine product we handle.
My advice is to stay away from the JAX LIGHT. They are expensive, and there is very little to gain by using it as you are still stuck using a slit lens.
Best regards,
Mark @ GTS

mark@getgts.com www.getgts.com



Bill Purdy
Expert Film Handler

Posts: 139
From: Seattle, WA
Registered: Oct 1999


 - posted 02-15-2001 09:20 AM      Profile for Bill Purdy   Author's Homepage   Email Bill Purdy   Send New Private Message       Edit/Delete Post 
Component Engineering is on the verge of offering a model for the Motiograph. It will not be a quick and easy install as some of the lens mount assembly will have to be removed (meaning, sawed off). It will be a part of our lower cost family of conversion. As soon as it is ready I shall post a notice and pix here. Some of the key parts are right now at our plating company being anodized.

------------------
Bill Purdy
Component Engineering



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