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EL31

Sensibly equivalent to:
CV2888
    
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The EL31 like the EL37 is a 25 Watt anode dissipation audio output pentode. The EL31 is designed for high anode voltages and lower current than the EL37 and can produce greater output power.
The EL31 is a true pentode. The anode is separated from the mica sheets by ceramic insulators.
The grids can be seen below the top mica. The control grid is fitted with a sizeable heat radiator.
The pinch and lower components.
The classic envelope is 43 mm in diameter and, excluding the IO base pins, is 119 mm tall.
References: Datasheet. Type EL31 was first introduced in 1948.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
1.4
600
400
-22.0
42
5.0
43,000
7.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 29, 2015.
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