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EBF2

 
    
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The EBF2 is a delightful double diode triode with the Mullard bright red metalising and our exhibit is unused. The valve is a high impedance variable μ pentode, with two auxiliary diodes all sharing a common cathode. This valve would have been used in radio receivers probably with the triode as an AGC amplifier. This would imply communications receivers as broadcast sets would use a straight triode for the audio voltage amplifier.
The classic envelope is 29 mm in diameter and, excluding the Ct8 base pins, is 85 mm tall.
References: Datasheet & 1043. Type EBF2 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)
g2
a
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
250
-2
5
2
2M
1.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 30, 2015.
shape:classic construction:pinch type:double.diode.pentode 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.g2 pin:8.a pin:tc.g1
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