▼ Menu

EH90

Sensibly equivalent to:
6CS6
See also:
Locked Oscillator Discriminator
    
Extras ▼

 

The EH90 is an indirectly heated heptode frequency changer. Later, in the 1960's, Mullard application engineers designed circuits for the EH90 to act as an FM demodulator for 6 MHz inter-carrier sound of UK 625 line television.
See The Mullard EH90 for more information.
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.
Return to Main Index