Tube holder to support all S series electron tubes for easy and safe operation. The five pin sockets for the tube are concealed inside the tube holder. A cathode protection switch is integrated into the tube holder, to protect the heated cathode from excessive voltage. The base plate has a slot for attaching the Helmholtz pair of coils S.

• Terminals : 4 mm safety sockets
• Dimensions: approx. 130×190×250 mm³
• Weight: approx. 570 g