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The ARP12 is a battery operated variable μ screened pentode. It was used as an RF or IF amplifier in portable radio receivers and could also be useful at AF.

The AR of the designation shows it as an Army Receiving valve, it also indicates that this exhibit predates the introduction of the CV series in 1941, in fact the gold paint is typical of 1930s production. The valve was included in the CV lists and redesignated as CV1331, commercially it was the VP23.

The gold paint obscures all of the internal details.

The classic envelope is 30 mm in diameter and, excluding the MO base pins, is 82 mm tall.

References: Data-sheet & ¹⁰⁴³. Type ARP12 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.