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The ARP3 is a variable μ RF pentode. The Type designation stands for Army Receiving Pentode number three. No maker is identified on this exhibit, however, there is an etched mark to the left of the paper label. This reads 32P3.

The 200 mA heater requirement indicates that this valve is suitable for series heater chain use, and the 13 Volt rating indicates vehicle battery operation.

Oliver Palix comments at radiomuseum.org: as with the 12Y4, the ARP3 is used in the WWII Canadian set C52.

The Marconi C52 short wave transceiver was designed for operation from a 12 Volt vehicle battery with a rotary transformer to generate the HT supply. Coverage was 1.75-16 MHz and this medium range set had an output power of 70-100 Watts CW or 45-75 Watts voice.

The perforated screen is clear of the silver gettering but the rest of the structure is obscured.

The classic envelope is 38 mm in diameter, and excluding the B7 base pins is 98 mm tall.

References: Data-sheet, ¹⁰⁴³ & ³⁰⁰². Type ARP3 was first introduced in 1934. See also 1934 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.