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7X7

 
    
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The 7X7 is a double diode triode but unlike most such valves the 7X7 has a separate cathode for diode two adding to the flexibility of use.
The diodes can be seen above the base with the amplifier triode at the top.
The side view of the diode anodes.
The heater passes up through the two cathodes in a single vertical rise.
The wide glass tube envelope is 29 mm in diameter, and excluding the B8B base pins is 70 mm tall.
References: Datasheet & 1040. Type 7X7 was first introduced in 1948.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a(t)
g1(t)
k
a(d1)
a(d2)
k(d2)
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
300
-1
1.9
67,000
1.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December26, 2011.
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