I wonder if Pacific TV in B.C. has what your looking for.
Might give you an idea of what socket you need and someone else could suggest another vendor if they don't or at a cheaper price if you pinpoint the exact socket you need.http://pacifictv.ca/socket.htm#ttsockets
Edit:or maybe here http://www.vacuumtubesinc.com/Products/ ... anual.aspx
Made the first post thinking your talking about a Stark 9-66. I have a Jackson 648 . I think my subconscious mind is trying to tell me something. Then again maybe its because I'm just getting real old .