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Author Topic: Dolby OPU-1 Richard B. Perrine Film Handler Posts: 89 From: Cuyahoga Falls, Ohio Registered: Apr 2000 posted 09-15-2003 09:22 PM                     I just picked up a Dolby OPU-1 pre-amp. Would like to fined some prints on the unit and instructions. Anyone got some knowledge of this unit? RBPerrine@aol.com  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 09-15-2003 09:28 PM                     I think you mean MPU1 I am assuming it is the mag preamp with the silver front cover?  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 09-15-2003 09:40 PM                     The MPU-1 was also made with a grey cover and red stripe to match the CP200 / CP65.  |  IP: Logged Chris Hipp Phenomenal Film Handler Posts: 1462 From: Mesquite, Tx (east of Dallas) Registered: Jul 2003 posted 09-15-2003 09:47 PM                     But you can only use the grey cover after labor day.  |  IP: Logged Peter Hall Master Film Handler Posts: 314 From: London, UK Registered: Dec 2000 posted 09-16-2003 12:29 AM                        There was a pre amp with the Dolby Mono systems installed in the early 1980s (with a C64 and a C22) - was this a OPU1 ?  |  IP: Logged Ray Derrick Master Film Handler Posts: 310 From: Sydney, Australia Registered: Sep 2001 posted 09-16-2003 10:33 PM                     The OPU-1 was a 1U rack mount studio optical preamp for use with telecine machines etc. It has been many moons since I laid eyes on one but I think it was stereo and it would have the usual gain and slit loss correction adjustments.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 09-17-2003 12:57 AM                       The OPU-1 consisted of input transformers, a Cat. No. 108 preamp, metering for Dolby level and line drivers to get up to 0 dB line level. This was well before the Cat. No. 240 came into existence. I've converted a few SA3/4 frames to take a Cat. No. 240 for use in studio and telecine applications where you need a true optical preamp.  |  IP: Logged Richard B. Perrine Film Handler Posts: 89 From: Cuyahoga Falls, Ohio Registered: Apr 2000 posted 09-17-2003 08:24 PM                     This one has optical stereo inputs for 2 machines (labeled "E + -)......the Cat 108-4 pre-amp card and a Cat 137A output card. On the back of the unit are the projector input strip, output terminals and 2 lugs labeled remote. Need some info on it.....like changing from proj 1 to 2 for change-overs. Would really like to have a book on it. RBPerrine@aol.com  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 09-17-2003 11:18 PM                       You are correct, it is a two projector device. The Cat. No. 137 was used as a line driver. The remote pins are for the changeover. Maintain contact for projector 2.  |  IP: Logged

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