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U52

Sensibly equivalent to:
5U4G CV575 CV1071 CV1575 GZ31 VU71
See also:
The Williamson Amplifier - Osram Valve Range Advert - Design for a 50 Watt Amplifier
    
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The U52 is directly heated full wave rectifier with a rating of 500 Volts on the anodes and a PIV of 1,400 V. The U52 has a maximum reservoir capacitor rating of 16 µF and a minimum series resistance of 180 Ohms.
The remains of the Marconi brand label. Etched on the glass is a second Type lozenge with the designation of 5U4G indicating complete equivalence with U52.
The anodes are folded to shape and then stitched together.
The top mica showing that it is an interference fit to the shoulder of the bulb. The tension springs hold the oxide coated ribbon filaments.
The classic envelope is 50 mm in diameter, and excluding the IO base pins, is 112 mm tall.
References: Data-sheet, 1040 & 1043. Type U52 was first introduced in 1938.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
f
-
a(2)
-
a(1)
-
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
5.0
3.0
500
250
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 21, 2020.
shape:classic construction:pinch type:rectifier.fw age:1930.1940 base:io heater:5.0v pins:8 pin:1.- pin:2.f pin:3.- pin:4.a pin:5.- pin:6.a pin:7.- pin:8.f
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