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The POVT168 is a directly heated mercury vapour rectifier. The prototype was the RG1-240 The CV identification after 1941 is CV1626.

See POVT168 for a view of the inner structure.

The reverse of this exhibit is also marked as MV42 which may be an internal GPO reference.

The B4 base pins.

Thanks to Mark Mallison for sending the images.

The classic envelope is  mm in diameter and, excluding the B4 base pins, is  mm tall.

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.