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EF97

Sensibly equivalent to:
6ES6 6K8P
    
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The EF97 is a variable μ RF and IF pentode for use in car radios. Note the very low anode voltage compared with previous generations of car radio valves that used a vibrator fed HT transformer.
The EF97 was introduced in 1959 just a few years before transistor car radios took the market.
The side view is no clearer than the front as the electrodes are obscured by the screen and gettering.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 47 mm tall.
References: Datasheet, 1040. Type EF97 was first introduced in 1959.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
12.6
6.3
-
3.0
1.1
0.15M
1.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 08, 2013.
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