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The AP4 is a 1937 acorn pentode for operation up to 430 MHz. Before the CV register in 1941 the service designation was the NR54 the later CV Type was CV1175.

Thanks to Mark Mallison for sending the image.

The thin envelope is  mm in diameter, and excluding the base wires is  mm tall.

Reference: Data-sheet. Type AP4 was first introduced in 1937. See also 1937 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.