This 4-pin chassis mount vacuum tube socket is designed for replacement and restoration projects in vintage radio receivers and audio amplifiers. Molded from durable phenolic body material with heavy-duty tinned solder lug terminals, it provides secure mounting and reliable electrical connection for standard UX 4-pin base tubes, including Type 45 power triodes, Type 80 rectifiers, and 201A triodes. Available in new production and vintage original conditions.