Octal base valve (tube) socket pcb mount. Can be ceramic or other (Bakelite, plastics etc.). The orientation is such that the components would go on one side of the board (the facing side) and the socket on the other side (thus mounted it would protrude thru chassis). You observe the pins of the socket from the "back" side therefore, pin 1 is in 6:30 position progressing CW till pin 8 is in the 5:00 oclock position, with the gap being between, 1 and 8. This gap is usually used to index the valve position for: > thermal/cooling design considerations (at least 1.5X of envolope dia. space between valves 2X would give saftey margin).

TWTADE

Green Illuminated Rocker Switch Body 25.8mmL x 10mmW x 18.3mmH Plastic Body with CNXLE KCD3 on the side of the body. 3 Contact NO_NC ON_OFF. Panel Mount with retention tabs on top and bottom that pop out once inserted into panel and prevent forward extraction, unless the tabs are depressed of course.