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2D4B

 
    
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The 2D4B is a pair of indirectly heated signal diodes with separate cathodes. The 2D4A has the same ratings but a single cathode and a B5 base cap.
The reverse is plain.
The balloon envelope is 41 mm in diameter, and excluding the B7 base pins is 74 mm tall.
References: Datasheet & 1043. Type 2D4B was first introduced in 1937.

 

Pin Connections
B7
1
2
3
4
5
6
7
m
a(2)
k(2)
h
h
k(1)
a(1)

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
4.0
0.35
200
0.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 22, 2016.
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