The Eimac SK-810B is one of the air-system sockets recommended for use with the Eimac 4CX1000A or 4CW2000A Tetrodes. The SK-810B is an improved version of the SK-810 and directly replaces the SK-810 in any equipment. The SK-810B features a stronger, one-piece base and improved contact tabs.When this socket is used, connection is made to each of the tube electrodes except the anode, and to one side of the integral screen-grid by-pass capacitor. The SK-810B is humidity and salt-spray resistant. Bypass Capacitor: 1500pf 400dcwv