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The Mazda UU60/250 was an indirectly-heated full-wave HT rectifier introduced at much the same time as the AC/Pen output pentode (1930) and intended to delay the delivery of HT until the cathode of the AC/Pen had warmed up sufficiently to draw current.

The construction shows that the support structure is clamped to the stem of the pinch. This is a labour intensive assembly technique more often found in professional valves rather than those produced for the retail market.

This full wave rectifier would have been used in domestic broadcast radio receivers. No values of reservoir capacitance or series resistance are given in the literature.

The balloon envelope is 57 mm in diameter and, excluding the B4 base pins, is 113 mm tall.

References: Data-sheet & ¹⁰⁴³. Type UU60/250 was first introduced in 1929. See also 1929 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum