The schematic for the 2561/62 was likely only available to nutone service ccnters. In my opinion, unless there is cosmetic damage or broken knobs, It is not worth replacing these units. Unless you're an experienced tech. Or are on a super tight budget, and you just want to experiment and don't mind gambling with vintage equipment. Your best bet is to have it serviced, Space-age has a flat rate for the 2561/62 http://tinyurl.com/by59p but any authorized nutone repair center should work. These units were usually loop wired because people wanted lots of stations all over the house. It is very costly to upgrade or replace. The best option is to have it repaired and then use AUX inputs to connect your home stereo for music distribution.

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