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X17

Sensibly equivalent to:
1C1 1R5 CV782 DK91 VT-171
See also:
Osram Miniature Valves Advert
    
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The X17 is a miniature heptode frequency changer and was designed for dry battery operation.
Miniature valves using B7G bases was a post war development in the UK following the influence on the industry of American designs and technology.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet & 3002. Type X17 was first introduced in 1947.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f-
a
g2,g4
g1
f-
g3
f+

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
90
45
-0
0.8
1.9
0.8M
0.25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 27, 2013.
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