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In the 6J5GT triode the electrode assembly is formed on a glass pinch. The envelope is a glass tube the width of the octal base. The anode plates are formed to leave an oval cavity for the grid and cathode.

The museum has examples of this valve in the classic G version (6J5G) and the original 1930s metal envelope (6J5). See also our article on the dissection of the metal version.

The electrical characteristics of each half of the 6SN7 match those of the 6J5. Additionally the 6J5 was developed into a VHF oscillator/amplifier and the resulting valves are 7193 and DET20. Both these derivatives have grid and anode brought out into top caps and the designs are very similar but not identical.

The National Union maker's name on the base cap.

The wide glass tube envelope is 29 mm diameter and excluding the IO base pins measures 66 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 6J5GT 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.