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The CV1074 is also marked with the UK Navy code of NR83. The prototype was the KTZ63 but the American design 6J7G is equivalent.

Type 6J7 design is a contemporary of the Magic Three and almost as ubiquitous. Although originally designed as a detector its linear characteristic and good internal shielding made it a natural choice for low level audio amplification.

It was for two decades the international standard valve for audio amplifier input stages and audio systems generally. The Mullard-Philips type EF37A, for many years the standard British low-noise audio pentode, is really a 6J7G under another name.

The top screen with control grid connection to the top cap and the round cathode tube.

The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 100 mm tall.

References: Private communication & data-sheet. Type CV1074 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.