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EH90

Sensibly equivalent to:
6CS6
See also:
Valves and their Habits - Locked Oscillator Discriminator
    
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The EH90 is an indirectly heated heptode frequency converter. It was also used in the 1960's as an FM demodulator for 6 MHz inter-carrier TV sound.
See EH90 for full details.
The side view of the anode shows the wire grids. The rods visible either side of the centre above the top mica are the g3 supports.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 47 mm tall.
References: Datasheet & 1040. Type EH90 was first introduced in 1954.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k,g5
h
h
a
g2,g4
g3

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
100
30
-1
0.75
1.1
1M
0.95
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 14, 2014.
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