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The CV3998 is a high-slope RF beam tetrode primarily intended for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment. The CV specification shows that the Government requirement was for the GPO telephone system. The prototypes were the 5A/170K from STC and the E180F from Mullard.

This very small size helps to reduce inter electrode capacitance and thereby raises the maximum usable frequency that the device can operate at.

The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 33 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV3998 was first introduced in 1957. See also 1957 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum