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The VT-107A is the US Government code for the 6V6GT and both are on the base of this RCA Valve.

The 6V6 family of beam tetrodes came in many constructions and were very popular as the final audio stage of broadcast receivers. The original 6V6 was an American metal can valve from the mid 1930s, and one of the first valves on an IO base.

The valves were capable of push pull use but the normal environment was as a single end output stage. With the revival of interest in valve hi-fi the 6V6 has again found popularity and a pair in push-pull will deliver 10 Watts with low distortion.

National Union on the base cap and 6V6GT/G etched into the glass. The supporting plastic band looks to have suffered heat damage.

The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 69 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type VT-107A 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.