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EBF2

 
    
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The EBF2 is a double diode triode. This exhibit is labelled Philips and is exactly the same dimensions as the Mullard sample that we have. The Ct8 base was popular on the Continent but never caught on in the UK. We suspect that both valves were made by Philips. 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.
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 December31, 2012.
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