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SU42

 
    
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The SU42 is an EHT rectifier with the pre-war 4.0V British standard heater.
The SU42 was made as a replacement type and requires an effective series resistance of 5,000 Ω and a maximum reservoir capacitor of 1.0 μF.
The anode has eight radial cooling fins and the ceramic at the top indicates high voltage and probably a valve designed for industrial use.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 100 mm tall.
References: 1040.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
1.25
6,000
40
Updated May 30, 2012.
shape:wide.glass.tube construction:pinch type:rectifier.hw age:1940.1950 base:io heater:4.0v pins:8 pin:1.- pin:2.h pin:3.- pin:4.- pin:5.- pin:6.- pin:7.- pin:8.h.k pin:tc.a
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