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The APV4 is the Tungsram implementation of this very common power rating indirectly-heated full wave HT rectifier. Our other APV4 has a different construction.

One side of the heater is connected to the cathode. The anode cavities are each made from two black pressed plates. This rectifier is designed to work into a maximum reservoir capacitor of 8 µF.

This type of rectifier was used in larger radios from the mid-1930s and remained in the lists until the 1960s.

The image shows both anodes, they are mounted parallel to each other but offset either side of a centre line.

The classic envelope is 45 mm in diameter, and excluding the B4 base pins is 98 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type APV4 was first introduced in 1936. See also 1936 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.