Dolby CP-50 Optical Stereo Cinema Theatre Processor 35mm Surround Sound & Manual

Description

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This is an early Dolby CP-50 cinema audio processor. This was the first 4 channel optical processor I am aware of on the market. It changed cinema audio. It provides 3 screen channels and 1 surround channel from 2 optical tracks recorded on the 35mm print.
Cards throughout this unit are low serial numbers. This comes with both a cat 110 stereo card and a cat 150 matrix card. The 150 was an ungraded process. The Sansui Surround card the complemented the 110 is not present.
It's still a great collectable of the late 70's cinema audio revolution. It probably could be made to work with little effort.
A manual of the proper vintage is also included.
I also have a CP-100 listed.
Thanks for looking.