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CV358

Sensibly equivalent to:
5A/157D CV5080 EF37A OM5B
See also:
The World's First Computer
    
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The CV358 is high impedance screened pentode designed for intermediate frequency amplifier use the prototype was the EF37. The high anode AC resistance suggests the use of high Q tuned circuits.
The EF37 and the low hum version EF37A were much used for top quality audio pre-amplifier applications.
The KB/DA identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the DA identifies the maker as Mullard Radio Valve Co., Blackburn.
The reverse is plain zinc paint.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 86 mm tall.
References: Data-sheet & 1040.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g3
nc
h
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
100
-2
3
0.8
2.5M
1.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 23, 2024.
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