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NR73

Sensibly equivalent to:
6N7G CV1285 ECC31
See also:
Quiescent Push-Pull
    
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The NR73 was a very popular and useful double triode badged here as a Navy Receiving valve. It was later given the CV reference of CV1285. A modified NR73 became the CV181 and commercially the ECC32.
Type NR73 and its commercial equivalent the 6N7G, is by no means a general-purpose double triode since it has a powerful heaters, a common cathode, and is designed to operate in push-pull Class B2 with zero grid bias. The anode to anode load is given as 8,000 Ohm. As an audio power valve it is capable of 10W output.
The classic envelope is 42 mm in diameter and, excluding the IO base pins, is 82 mm tall.
References: Datasheet & 1043. Type NR73 was first introduced in 1937.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a(2)
g1(2)
g1(1)
a(1)
h
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
6.3
0.8
300
0
35.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 04, 2013.
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