Sensibly equivalent¶ to:
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.
Absolute Maximum Operating Conditions¶
Updated October 04, 2013. shape:classic construction:pinch type:double.triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a(2) pin:4.g1(2) pin:5.g1(1) pin:6.a(1) pin:7.h pin:8.k