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956

Sensibly equivalent to:
CV649
See also:
The Famous EF50 of WWII - A datasheet for the 956 - Acorn Antiques
    
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The acorn valves were designed to have low capacitances and therefore work to higher frequencies than the normal valves.
Radio amateurs used them for work at 144 MHz after WWII.
Thanks to G6RHV we have details of the operating conditions. The information comes from the leaflet packed with the valve and gives the data as 'Tentative Characteristics' and dates from 1936. The year the 956 was introduced. Clink the link above for a reproduction of the data sheet.
The valve is marked JRC956, the JRC marking being a US Government quality code.
The acorn envelope is 14 mm in diameter and, including the base pins, is 45 mm tall.
References: Datasheet. Type 956 was first introduced in 1936.

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.15
250
100
-3
5.5
1.8
0.8M
1.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 24, 2013.
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