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HF93

Sensibly equivalent to:
12BA6 CV1928
    
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The HF93 is a variable μ pentode for use at HF within AC/DC receivers. Most probably as RF or IF amplifiers. This particular Mullard valve was made by the parent company Philips in Holland.
Looking along the grid axis, the suppressor grid is the easiest to see.
The plain rear of the cylindrical anode.
The thin glass tube envelope is 17 mm in diameter and excluding the B7G base pins, is 47 mm long.
References: Datasheet & 1040.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
gm
6.3
0.3
250
100
-1
11
4.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 24, 2018.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.g3.s pin:3.h pin:4.h pin:5.a pin:6.g2 pin:7.k
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