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VT-94 is part of the American VT (Vacuum Tube) series of military designations. Commercially the Type designation is 6J5.

The VT- series are quite separate from the UK VT or Valve Transmitting designations used by the RAF.

This exhibit is from RCA who developed the manufacturing technique of sealing lead-out wires into a small glass disc that replaced the pinch and reduced lead lengths. Valves made in this way appeared from 1935 and at the same time the International Octal base was introduced.

The VT-94 / 6J5 is a classic general purpose triode design that is an improved version of the original 6C4 from RCA, and appears in many envelope shapes. In dual form the 6J5 becomes the 6SN7 double audio triode. With the anode and control grid taken to top caps the 6J5 became, in essence, the 7193.

See 6J5 for construction details.

The thin metal tube envelope is 24 mm in diameter and, excluding the IO base pins, is 50 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type VT-94 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.