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The 6J5 triode electrode assembly is formed on a 17 mm diameter pressed glass foot. This exhibit is the Westinghouse Canada 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.

Note the 6J5 stamped into the envelope as well as the printed branding.

Westinghouse - Made in Canada.

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.