OHM A'S are they rare?

So to all of the great audio guys out there in Audiogon land, has anyone ever heard the OHM A'S and are they rare like I have been told? I ask this question because I have an opportunity to rescue a pair that has been sitting in a old home and was told that they may not work? Can they be saved from the garbage bin? And brought back to life, someone told me that they only made a handful of them, I don't know can someone please help me out. Need info.