Perhaps the device referred to is the Nuvistor? These were used in VHF applications. [e.g. 6CW4] They are metal and don't look all that different from early transistors. The size is similar also, the Nuvistor is 0.400" dia. and a TO-5 is 0.335" diameter.
Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/