---------- From: Edward V. Phillips [SMTP:ed-at-alumni.caltech.edu] Sent: Friday, March 20, 1998 2:06 PM To: tesla-at-pupman-dot-com Subject: Re: 811a tubes 811's use a standard 4-pin socket. Antique radio supply (should all be capitalized) had ceramic sockets available a while back, and probably still does. At TC frequencies any socket would work. Ed