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EF93

Sensibly equivalent to:
6BA6 6K4P CV454 PM04 W727
    
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The EF93 is a miniature screened pentode on a B7G base. It is a variable μ valve designed for HF use.
The outer screen is connected to g3 at the top and to pin 2 at the base.
The hole in the screen reveals the three helical wire grids within.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Data-sheet, 3002 & 1040. Type EF93 was first introduced in 1951.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-1
11
4.2
1.5M
4.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.g3 pin:3.h pin:4.h pin:5.a pin:6.g2 pin:7.k
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