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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.
This valve envelope is the final form of the B8A based valves with an all glass construction including a locating pip on the 'skirt'.
Opposite the holes in the anode the glass is coated to reduce the release of gas from the glass through the action of electron bombardment.
The slots in the anode seen through the coating.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 52 mm tall.
References: Data-sheet, 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 July 25, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b8a heater:6.3v pins:8 pin:1.h pin:2.a pin:3.ic pin:4.ic pin:5.g2 pin:6.g1 pin:7.k pin:8.h
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