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The 6J5 triode electrode assembly is formed on a 17 mm diameter pressed glass foot. As an American manufactured product this equates to a 1 inch outer diameter tube and 2 inches tall. This exhibit is the Westinghouse version.

The same technique of hard glass base was used for all glass miniature valves. In the case of metal valves the glass base is bonded to a metal tube envelope. The evacuation of the envelope is made through the base. The IO or International Octal base was introduced by RCA for the metal valves in 1935.

The envelope carries the words - Licenced by Thermionics Ltd.

The Canadian Maple leaf logo and the letters REL and R within. REL stands for Research Enterprises Ltd. a canadian Crown Corporation set-up during WWII and operated making radar equipment etc. for six years from 1941.

The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 51 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type 6J5 was first introduced in 1936. See also 1936 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.