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N37

 
    
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The N37 is a television type audio output pentode.
The load impedance is 6000 Ohms and the cathode resistor is 330 Ohms. At 10% total harmonic distortion the valve can produce 2.3 watts of audio.
The red Marconi label covers most of the envelope circumference.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 58 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k
h
h
a
ic
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
13.0
0.3
165
165
-11.4
29.0
5.4
23200
9.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 03, 2013.
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