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EL42

Sensibly equivalent to:
BF62 CV3890 N151
    
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The EL42 is an audio output pentode of an early all glass design. In single ended Class A an output of 2.5 Watts was to be expected. This was sufficient for most car radio receivers, but a pair in push-pull would generate a respectable 5.5 watts for larger receivers and audio equipment.
The EL42 took over from the EL2 and EL32 and was in turn replaced by the EL95 but the EL85 is electrically identical to the EL42.
The end wall of the anode has holes but the gettering prevents seeing the grids. The supports for the three wire grids can be seen above the top mica.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 52 mm tall.
References: Datasheet, 3002 & 1040. Type EL42 was first introduced in 1947.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
ic
ic
g2
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
rk
rl
Pout
D
6.3
0.2
225
225
-10.0
26.0
4.1
90,000
3.2
360
9,000
2.5
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 28, 2016.
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