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The RCA 920 is a dual photocell with a maximum sensitivity in the infra rad region.

The design purpose is sound reproduction - cinema?

The two photo-cathodes come close to one another along the centre line. The anode wires are offset to each side.

The UX4 base cap and pins.

The original box.

Thanks to Mark Mallison for sending the images.

The wide glass tube envelope is  mm in diameter, and excluding the UX4 base pins is  mm tall.

Reference: Data-sheet. Type 920 was first introduced in 1945. See also 1945 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.