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NT92

Sensibly equivalent to:
4212E CV1252
See also:
CV1252 short entry
    
Extras ▼

 

The NT92 is a large directly heated triode for use in radio transmitters. The valve shown is a Western Electric Type 4212E. The NT92 was used in class AB push-pull to provide audio modulation for medium-sized transmitters. The load impedance was quoted as 5 kΩ and would produce 50 Watts in single end configuration.
The red marking is characteristic of valves supplied by Western Electric (USA) and thus 212E. STC in the UK would have made the 4212E in the UK as 4 was their prefix.
The filament is a single thread that passes through the anode cavity five times in a series of inverted 'V's.
The wide glass tube envelope is 84 mm in diameter and, excluding the base pins, is 295 mm tall.
References: Datasheet & 1043.

 

Pin Connections
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
14
6
1,500
-57
170
1,900
8.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 09, 2015.
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