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This exhibit is a 5Z4G full wave rectifier the word Electron may be a brand name.

Professional equipment, including radar, etc., sometimes required circuits in which valve cathodes carried large signals and had to 'float' at voltages well below that of the chassis. Glass-envelope '-G' versions of common metal types were therefore required.

Designed to supply equipment of up to 40 Watts total power, this rectifier was made by several manufacturers. This suggests a very popular type, and one that found use in military equipment during WWII.

The twin anodes with holes. The central rods are the anode connections.

The lower mica showing the cathode tube connected to one side of the heater.

The classic envelope is 44 mm in diameter and, excluding the IO base pins, is 102 mm tall.

References: Data-sheet, ¹⁰⁴³ & ¹⁰⁴⁰. Type 5Z4G was first introduced in 1940. See also 1940 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.