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The VP41 is a variable-mu RF amplifier pentode from Mazda on the MO base that Mazda called the British Octal. Although released in 1938 Mazda were still advertising it in 1948 when the world was moving to smaller all glass valves.

The reverse is plain zinc paint screening.

The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 91 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type VP41 was first introduced in 1938. See also 1938 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.