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The VU133 is a high voltage rectifier. It is clear that this type was produced by more than one factory. See VU133 for another form of construction. The valve was designed to produce the EHT for the magnetron in a radar transmitter. The pulse power would be 0.5 to 1.0 MW but the average energy was quite low as the short pulses were produced at relatively long intervals.

The maximum working PIV is 6,500 Volts while the maximum of load PIV is 7,000 V. Peak anode current is 400 mA, reservoir capacitor is 1 μF max and the valve must have a minimum of 850 Ω series resistance.

Visual examination of this valve shows that the cathode tube runs vertically through the finned anode. The anode plates are formed to leave a cylindrical cavity about 8 mm in diameter. The high voltage nature of its design are hinted at by the ceramic insulators holding the anode. The heater wire is folded and four lengths are enclosed by the cathode.

See VU133 for details.

The classic envelope is 46 mm in diameter and, excluding the B4 base pins, is 123 mm tall.

References: Data-sheet & Private communication.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.