Thank you very much for your help! I will keep posting on as many audio sites as I can to try to find one. I know the MS-one was the original flagship of Spectral back in the mid 70's. Damian Martin was the genius behind the MS-One. He had posted on a web site that there were only 15 to 20 of these ever put in production.
Spectral MS-One Preamplifier
I have been looking everywhere for an owners manual for this preamplifier for weeks with no luck! Tried faxing Spectral but no reply. Anyone out there know where I could download or I would pay good money for an original manual! Please contact me if you have one or know of one. Thanks!