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N42

Sensibly equivalent to:
KT42
    
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The N42 is an audio output pentode with a maximum anode dissipation of 8 W. The N42 was introduced in 1935 but was replaced by the KT42 beam tetrode in 1937.
The heater is the pre-war british standard of 4.0 Volts at 1 Amp, and the N42 was designed for receiver output stages following a detector and triode voltage amplifier.
The envelope is etched on one side and has the paper Marconi label on the other.
The classic envelope is 44 mm in diameter, and excluding the B7 base pins is 97 mm tall.
References: Datasheet & 1043. Type N42 was first introduced in 1935.

 

Pin Connections
B7
1
2
3
4
5
6
7
-
g1
g2
h
h
k
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.0
250
250
-16.5
34.0
5.5
7,000
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December13, 2012.
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