The UU5 ia another classic Mazda indirectly-heated HT rectifier. One side of the heater is connected to the cathode. This rectifier is designed to work into a maximum reservoir capacitor of 8 µF.The UU4 (350V) and UU5 (500V) were used in larger radios from the mid-1930s and remained in the lists until the 1960s. They were staunch work-horses. Used in large numbers by the British services, there are plenty of good ones still around.![](../pics/aaq0362a.jpg)
The twin anodes seen side on. The central rod connects to the cathode tubes of both rectifier sections.![](../pics/aaq0362b.jpg)
The identification is etched into the dome.The classic envelope is 45 mm in diameter, and excluding the B4 base pins is 102 mm tall.References: Data-sheet, 1040 & 1043. Type UU5 was first introduced in 1936. See also 1936 adverts. |