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woke up to find the man cave in slight disarray

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OldiesButGoodies:
The audio amp board is the one at the bottom (low freq comp,  equalization, record/repro levels etc.).  The service manual does not mention that convenience. Will explore it next time I crack it open.  I am now working on a Revox B77 and the Otari is closed up. 

papabearjew:
My ReVox B77 plays for 15-20 minutes then the left channel dies. Ideas? No smart ass comments please. If I wasn't that I'll just ask BJ.

OldiesButGoodies:
Try re-seating all the cards,  specially the reproduce amp card, second from the right (and/or take it out and clean the contacts with isopropyl alcohol).  Borrow a spare reproduce card from a known good unit and see if that fixes it.   :-\

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