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Like a 620A, which is just an improved version of the SK620. Believed to be new or used very little. May have tarnished metal. Used in Ham Radio, Induction Heaters, Plasma Generators, and RF Generators. The EIMAC SK-620 is one of the Air-System Sockets recommended with those tubes listed or other tube types having the same special 9-pin base. A ceramic SK-626 Air Chimney or a fiberglass-reinforced EIMAC resin SK-636 Air Chimney are also available and are recommended for use with the socket when air-cooled tubes are to be employed except the 8930. 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-620 Air-System Socket is humidity and salt-spray resistant. The SK-620A is an improved SK-620 which includes a slightly modified screen by-pass capacitor sealed with an improved encapsulating material to insure reliable performance under high humidity or moisture conditions. The SK-620 Air-System Socket consists of eight screen-grid contact fingers, seven pin contacting terminals (no contact is made to pin No. 5), a center control-grid terminal, and an integral screen by-pass capacitor. The cathode of the tube is connected to its external circuits by the four even-numbered base pins which are connected in parallel to minimize the effects of lead inductance; these terminal lugs are insulated from the socket body. Screen-grid By-pass Capacitor: Incorporated in the socket structure is a low-inductance by-pass capacitor, 1100 pF +/- 20%, which provides a short radio-frequency path to ground. The silvered-mica dielectric, encapsulated in epoxy resin, is humidity and salt-spray resistant. The sockets are hi-voltage tested at 2000 volts dc and are rated for use at 1000 volts dc. When this socket is mounted on a grounded chassis, one side of the screen-grid by-pass capacitor will automatically be grounded. The metral shell, or body, of the socket is silver-plated brass. The screen-grid contact fingers and base pin terminals are fabricated of beryllium-copperm, heat-treated after forming, then silver-plated. The center control-grid terminal is silver-plated brass. The socket insulating material, polytrifluorochloroethylene, is a chemically inert, non-flammable, will not absorb water or water vapors, and is not affected by acids or alkalies. It will not react to normal solvents, except in the case of halogenated compounds which will induce minor dimensional changes. Its physical characteristics are stable over a temperature range of -196 degrees C to +199 degrees C and it is resistant to embrittlement and thermal shock. > Associated Tube: 4X150A/7034 Associated Tube: 4CX250R/7580W Associated Tube: 4CX250FG/8621 Associated Tube: 4CX350FJ/8904 Associated Tube: 4CX250BC/8957 (We do not proofread any ads submitted by members) |
ann-salazar@desmoines-classifieds.com (Ann Salazar) for more information. Your emails will be instantly forwarded to the poster's private address.
