Control card dated 1974. Believed to be from the Stadttheater Baden-Baden. 240 control channels. Ampex modules are ferrite core blocks used for the show memory (similar to those used in MMS). Ferrite core blocks were used because they were non-volatile and retained their contents when the power was off.

Strand PDP11 DDM Electronics Rack (August 2014)
From The NEET Collection
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Strand PDP11 DDM Electronics Rack (August 2014)
From The NEET Collection
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Strand PDP11 DDM Electronics Rack - Rear (August 2014)
From The NEET Collection
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