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X78

 
    
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The X78 is a triode hexode mixer. The triode has to supply 10 volts pk-pk to drive the hexode mixer correctly.
The paper Marconi label.
The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 45 mm tall.
References: 3002 & 1040. Type X78 was first introduced in 1949. See also 1949 adverts.

 

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

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
75
0
4.5
3.4
0.7M
0.78

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
gm
100
-1
10.0
2.8
Updated December20, 2017.
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