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There are some manuals you can download here which may contain the specs you are looking for: https://www.hifiengine.com/manual_library/revox/b77.shtml On 4/17/2019 3:37 PM, Shai Drori wrote: > My B77 has a board that I can’t find any info about. Was told it might be > slide sync. Board number is 1.177.275-12. Any information would be great