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U50

Sensibly equivalent to:
5Y3G 5Y3G/GT CV1268 CV3754
See also:
Osram KT2, KT63, KT61, KT66, PX4, U50, KT76, KT33C, KT71, U76 & U31 Advert - CV1268 short entry
    
Extras ▼

 

The U50 is a directly heated full wave rectifier, with inverted v's of coated tape as filaments.
The maximum reservoir capacitance is 32 µF and minimum series resistance is 100 Ohms.
The Marconi paper label on this M-OV valve.
The twin anodes are folded and stitched. The supports are placed between the nickel sheet. The filament is oxide coated ribbon.
A closer view of the coated filament. Note the signs of the coating flaking off.
The classic envelope is 45 mm in diameter, and excluding the IO base pins is 103 mm tall.
References: Data-sheet, 1040 & 1043. Type U50 was first introduced in 1937.

 

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
2.0
350
120
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 08, 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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