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959

Sensibly equivalent to:
CV813 CV1794
See also:
The Famous EF50 of WWII - Acorn Antiques
    
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The 959 is an acorn pentode designed for battery use. We know of no commercial use for high frequency acorn valves and think that they may have been designed for military use. Possibly in portable VHF radio equipment.
The acorn envelope is 14 mm in diameter and, excluding from tip to tip is 44 mm tall.
References: Datasheet. Type 959 was first introduced in 1938.

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.25
0.05
145
67.5
-3.0
1.7
0.4
0.8M
0.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 24, 2013.
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