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EF12

 
    
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The EF12 is a pentode designed for RF or IF amplification at HF or MF. Also the datasheet gives details for its usa as an AF amplifier.
The footless construction uses a glass disc rather than a pinch.
The top of the painted steel envelope.
A close-up of the Telefunken logo.
The footless base pins are shaped to maintain grip within the base. The spigot covers the evacuation tube.
The wide metal tube envelope is 36 mm in diameter, and excluding the footless base pins is 35 mm tall.
References: Datasheet & 1040. Type EF12 was first introduced in 1939.

 

Pin Connections
Footless
1
2
3
4
5
6
7
8
g2
g1
k,g3,m
-
h
h
-
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
μ
6.3
0.2
250
100
-2
3.0
1.0
2M
2.1
25.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 01, 2012.
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