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EL12Spec

 
    
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The EL12Spec was made by the Czechoslovakian manufacturer Tesla. It is an Audio output pentode and the naming convention of EL12 follows the Philips/Mullard principles. So we also know that this valve has a 6.3 Volt heater.
The Footless base is a continental that is rarely seen in UK made equipment.
The classic envelope is 44 mm in diameter and, excluding the Footless base pins, is 117 mm tall.
Reference: Datasheet. Type EL12Spec was first introduced in 1940.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
1.2
425
425
-1.3
42.0
5.0
50,000
10.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 22, 2013.
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