When Spectral started in the late 70's, their products where designed by co-founder Demian Martin which are his initials, "DM" on all the DMC models. Demian's products where so damn good sounding that a cult following built up by the late 80's. One of the best SS pre-amps I've ever heard to date was the Martin designed DMC-10. In '92 I spent the afternoon at a friends house and listened to the 10 and was hypnotized by its luxurious, rich sound that was smooth as silk, with a very organic, warm relaxed character.
I'd swear it was a tube pre-amp with my eyes closed. Keith Johnson took over the designs starting with the DMC-12 and things haven't been the same since. Keith's designs do not have the soul that were in Demian's products.