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CV5377

Sensibly equivalent to:
CV4014
See also:
EF91 - not the valve that won the war - GEC CV4005 U78, CV4014 Z77 & CV4062 N78 Advert - The EF91 and the Blue Band
    
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The CV5377 is a special quality version of the EF91. The M8083 has a more rugged build than the EF91 and was designed for operation in areas of vibration especially aircraft and styled CV4014 for UK government procurement.
The prototype for the CV5377 was the CV4014, and the CV5377 is a long life version with low cathode resistance.
The multiple mica discs confer vibration resistance. The anode is the pair of plates joined by a strap. The bright central part cylinder is a screen.
The blue band that inhibits gas release from the glass is dark and thus thicker than normal, this makes observing the internal structure difficult but the outer grids can just be seen.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k
h
h
a
g3
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
250
-2
10
2.5
1M
7.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 06, 2019.
shape:thin.glass.tube construction:all.glass type:pentode age:1960.1975 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.a pin:6.g3 pin:7.g2
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