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The 25Z5 is an American TV rectifier. Within the envelope, sharing a common heater, are two independent rectifiers. The heater current of 0.3 Amps is one of the standard heater chain currents.

The independent rectifiers make three configurations possible: the pair as a full wave rectifier, the pair to produce 250 V from 117 V mains in voltage doubler configuration, and lastly in parallel as a half wave rectifier.

The maximum reservoir capacitor is quoted at 16 µF.

See also 25Z6G and 25Z6GT for IO based versions.

The etched identification also carries the words Made in USA.

The anodes seen end on, front to back is 3 mm.

The classic envelope is 38 mm in diameter and, excluding the UX6 base pins, is 91 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 25Z5 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.