The UU8 is a full wave rectifier on the short lived Mazda Octal base. The literature shows the valve with external metallisation and our other exhibit UU8 has the metal paint, this valve is clear. This exhibit is probably of late manufacture for use as a replacement part.
The UU8 was used in the 1948 Murphy television receiver V114.
The maximum load current of 250 mA is substantial for a device of this sort. The maximum reservoir capacitor value of 16μF is typical.
There are four rectifier cathodes in this valve connected as a pair of rectifiers. The anodes are formed in part as open cylinders.
Looking at the top mica it can be seen that pairs of cathodes are strapped together. The tubular structure of the anodes is clearly visible.
The lower mica with four sets of heaters and cathodes.
The classic envelope is 54 mm in diameter, and excluding the MO base pins is 96 mm tall.
References: Data-sheet, 1040 & 1043. Type UU8 was first introduced in 1939. See also1939 adverts.
