These metal tube socket retainer cups are designed to secure 1-1/8" vacuum tube sockets to equipment chassis. Constructed from stamped steel or aluminum, they provide mechanical stabilization and grounding support for tube sockets used in vintage radios, audio amplifiers, and communications receivers. Historically manufactured by component suppliers such as Cinch-Jones, Amphenol, and Eby, these cups reinforce socket mounting and help hold tube shields or retaining hardware in place.