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U74

Sensibly equivalent to:
35Z4GT U76
    
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The U74 was introduced during the first half of the 1940s. This half wave HT rectifier was later replaced by the U76 that had a rectified current of 100 mA.
The lower part of the envelope is covered internally by the getter deposit.
The front to back dimension is about 2 mm.
The cathode tube is rectangular. The heater wire is made from coiled wire coated with insulation. Two sections are wired in series with each of the four wires in the cathode laying side by side.
The classic envelope is 39 mm in diameter and excluding the IO base pins and spigot the height is 85 mm.
References: 1040. Type U74 was first introduced in 1945.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
ic
h
-
-
a
-
h
k

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
30
0.16
250
75
Updated January 24, 2018.
shape:classic construction:pinch type:rectifier.hw age:1940.1950 base:io heater:150ma pins:8 pin:1.ic pin:2.h pin:3.- pin:4.- pin:5.a pin:6.- pin:7.h pin:8.k
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