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The 40SUA or 40-SUA from Cossor is a half wave rectifier to complement their range of 13 Volt 300 mA heater based valves. This range was designed for sets without a mains transformer that would operate on 240 Volt mains AC or DC. In the UK DC mains supplies were still present in some areas in the early 1930s.

Thanks to Mark from Vintage-parts for sending this image.

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

Reference: Data-sheet. Type 40SUA 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.