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The PY31 is a half wave HT rectifier for use on AC or DC mains. The 300 mA heater indicates that television receivers were the main application.

The anode is blackened for good heat radiation and the extra width add to the total surface area available for heat loss.

Face view of the anode. The gettering obscures many internal features.

The classic envelope is 40 mm in diameter, and excluding the IO base pins is 87 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type PY31 was first introduced in 1954. See also 1954 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.