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EB4

Sensibly equivalent to:
DD6DS MEB4 TEB4 VEB4
See also:
Mullard EF8, ECH2, EBC3, EF9, EB4, EL3 & AZ3 Advert
    
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The EB4 is a pair of signal diodes in a single envelope. Each section is internally screened. The EB34 from 1941 is almost identical but has slightly higher inter-electrode capacitances. The EB4 was designed for signal detection.
The stamp on the back is a BBC test indication.
The balloon envelope is 31 mm in diameter and, excluding the Ct8 base pins, is 60 mm tall.
References: Datasheet, 3002 & 1040. Type EB4 was first introduced in 1936.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a(2)
k(2)
a(1)
-
h
k(1)

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
6.3
0.2
140
0.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 09, 2013.
shape:balloon construction:pinch type:double.diode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a(2) pin:4.k(2) pin:5.a(1) pin:6.- pin:7.h pin:8.k(1)
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