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EBC3

Sensibly equivalent to:
CV1428
See also:
Mullard Red 'E' Series Advert - Mullard EF8, ECH2, EBC3, EF9, EB4, EL3 & AZ3 Advert - Mullard EBC3 Box
    
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The EBC3 is a double diode triode. It would be used as detector and AGC detector as well as first audio amplifier stage in a superhet receiver. This exhibit is unused and the base contacts are still corrosion free after nearly 80 years.
The base is of the eight side contact variety. These bases were greatly disliked by UK engineers as the valves did not stay properly in place and the contacts oxidized causing intermittent faults. Mullard released this valve in an IO based version as well as a result of this market pressure. This is the EBC33.
The reverse is plain zinc paint coloured the Mullard red.
The classic envelope is 30 mm in diameter and, excluding the Ct8 base pins, is 85 mm tall.
References: Datasheet & 1043. Type EBC3 was first introduced in 1938.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
tc
m
h
h
k
a(d1)
a(d2)
-
a
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.2
250
-5.5
5.0
15,000
2.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 02, 2018.
shape:classic construction:pinch type:double.diode.triode age:1930.1940 base:ct8 heater:6.3v pins:8 pin:1.m pin:2.h pin:3.h pin:4.k pin:5.a(d1) pin:6.a(d2) pin:7.- pin:8.a pin:tc.g1
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