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956

Sensibly equivalent to:
CV649
See also:
The Famous EF50 of WWII - A data-sheet 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. Click the link above for a reproduction of the data sheet.
All three wire grids can be seen through the notch in the anode.
Made in USA.
The acorn envelope is 14 mm in diameter and, including the base pins, is 42 mm tall.
References: Data-sheet. 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 July 08, 2020.
shape:acorn construction:all.glass type:pentode age:1930.1940 base: heater:6.3v pins:5 pin:
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