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The CV1941 is a vari-μ RF pentode mainly used as an IF amplifier in superhet receivers. The prototype was the 6K7G.

This exhibit has both the CV1941 and the older NR81 designations.

The Printed Type designations. There is no manufacture data present.

The screening hides the internal structure from the side and top.

From below and between the two screens can be seen the wire grids. The heater is folded into four.

The classic envelope is 37 mm in diameter and, excluding the IO base pins, is 95 mm tall.

Reference: Data-sheet. Type CV1941 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.