Valve Gallery - Rectifiers (2)

Valves: U30, U33, UU6, UU8.

Shown above is a Marconi Osram U30.  This is a comparatively rare valve designed for DC mains or Universal receivers.  It has a high heater voltage of 26v, all the valves in the chain would have high voltage heaters in order to drop the mains voltage.  It is used in the GEC Universal Mains 3.  B7 base, height 130mm. Shown above is a Marconi Osram U33 with B4 base.  This rectifier is another high voltage rectifier, with a maximum voltage of 6300v but an I of only 3mA.  It has a heater voltage of only 2v, and it is 123mm in height.

Shown above is a Mazda UU6 rectifier.  Uses Mazda Octal base with 4v heater.  Max voltage of 350v with max I of 120mA. Height of 108mm Shown above is a Mazda UU8 rectifier.  Uses Mazda Octal base. "UU" usually denotes "full-wave".  4v heater, maximum voltage of 350v but quite high max I of 250mA.  Height of 116mm.

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