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CV1972

Sensibly equivalent to:
6SF5
    
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The CV1972 (6SF5) is a high gain triode designed for RC coupled voltage amplifier use in audio equipment, especially vehicle battery powered sets. The 12SF5 differs only in heater rating.
The 6F5 has the control grid taken to the top cap.
The KB/N identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the N identifies the maker as Nore Electric, Southend.
The reverse with the original Type stamped into the steel.
The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins is 51 mm tall.
References: Data-sheet & 1043. Type CV1972 was first introduced in 1938. See also 1938 adverts.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.3
200
-2
0.9
66,000
1.15
100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2025.
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