▼ Menu

    
Extras ▼

The U143 is absent from most of the literature but was a post war full wave rectifier with the old UK standard 4.0 Volt heater.

The twin rectifier sections with ribbon filaments.

In this image the oxide coating on the filament can be clearly seen.

The classic envelope is 45 mm in diameter and, excluding the IO base pins, is 99 mm tall.

Reference: ³⁰⁰². Type U143 was first introduced in 1949. See also 1949 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶