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The ARDD1 is a double diode The AR stands for (UK) Army Receiving.

The visible cylinder is a screen strapped internally to the cathode. Within the screen are two small anodes mounted vertically around the cathode.

The direct equivalence between the ARDD1 and the commercial 10D1 is made clear by the etched lettering on the envelope.

At the top of the electrodes, and inside the screen are the two rods that form the anodes.

The classic envelope is 38 mm in diameter and, excluding the B5 base pins, is 91 mm tall.

References: Data-sheet & ¹⁰⁴³. Type ARDD1 was first introduced in 1936. See also 1936 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.