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NR68

Sensibly equivalent to:
6Q7G CV587+D5855 POVT194
See also:
The 'Magic Three' Valves - CV587 short entry
    
Extras ▼

 

The NR68 (6Q7G and CV587) is a double diode triode and was designed for receiver audio use.
The diodes would be for signal and AGC rectification and the triode would act as AGC amplifier or first audio amplifier.
This is an American made valve marked with the requirements of the UK Government procurement.
The triode sits at the top with the control grid connected to the top cap. The lower bright screen housed the two vertical rod diode anodes.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 96 mm tall.
References: Datasheet, 1040 & 1043. Type NR68 was first introduced in 1936.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
a(d2)
a(d1)
nc
h
k
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-3
1
58k
1.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December10, 2019.
shape:classic construction:pinch type:double.diode.triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.a(d2) pin:5.a(d1) pin:6.nc pin:7.h pin:8.k pin:tc.g1
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