Tube shields for 9-pin and 7-pin twist-lock sockets as found in R-390, etc. Used. Specify minimum/maximum height required when ordering. $1.00 each Good used tube sockets for 9-pin and 7-pin miniature tubes. Sockets accept twist-lock shields. 9-pin are plastic. 7-pin are ceramic. $1 each New tube sockets for 7-pin miniature tubes. $2 each New tube sockets for 9-pin miniature tubes. Sockets accept twist-lock shields. $3 each New tube sockets for 9-pin miniature tubes. $2 each