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1R5

Sensibly equivalent to:
1C1 CV782 DK91 X17
    
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The 1R5 miniature heptode frequency changer was designed for dry battery operation. The exhibit is in the original box that is marked JRC1R5 US Army May 1945. UK production of B7G based valves started a couple of years later than in the USA.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet, 1040 & 1043. Type 1R5 was first introduced in 1945.

 

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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