A little while ago I obtained a stack of old electronic instrument paperwork which I’ve been sorting through and am planning to scan. To start with, this is a single sheet giving what seems to be an update for the Armon “A61S-A492-K4009-ARMONPIANO”. I’m not clear whether that’s one or three separate models. The update is for a revision to a tone generator board, now AR-27. It’s undated but I’d guess late-70s. Perhaps this will be of interest to someone?

original drawing by Armon c.1970s

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