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The 4052A RF transmitting pentode was introduced in 1938. The application was in HF communications.

This image shows the box anode and is illuminated by the filament - thoriated tungsten.

Thanks to Mark Kelsall for sending the images.

The wide glass tube envelope is 50 mm in diameter and, excluding the UX5 base pins, is 215 mm tall.

Reference: Data-sheet. Type 4052A 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.