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The CV485 (commercially the STC V246A/2K also printed on the envelope) is a Heil Tube. Named after its German inventor, the Heil tube is a velocity modulated oscillator and the Heil tube was developed by STC during WWII. Unlike the klystron the electron beam in the Heil tube is focused by an external magnet. This refinement was originally added to keep the bunched electrons together as the electric charge would, of course, tend to repel the electrons one from another.

The V246A/2K looks to be a selected V246A/1K but no specific data has yet been found.

The KB/F identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the F identifies the maker as STC, Paignton.

The resonator connects to the copper disc and also to the base pin 6.

The thin glass tube envelope is 19 mm in diameter, and excluding the B7G base pins is 73 mm tall.

Reference: Data-sheet. Type CV485 was first introduced in 1957. See also 1957 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.