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VT-238

Sensibly equivalent to:
956
See also:
The Famous EF50 of WWII - A data-sheet for the 956 - Acorn Antiques
    
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The VT-238 is the US Government procurement code for the 956 acorn pentode. The acorn valves were designed to have low capacitances and therefore work to higher frequencies than the normal valves. They were designed in the mid 1930's as the quest for efficient working at ever higher frequencies was sought.
The grids can be seen but the image is distorted by the glass. The anode connects to the top pin.
The control grid connection below the main side pins.
The acorn envelope is 14 mm in diameter and, including the base pins, is 45 mm tall.
References: Data-sheet.

 

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 June 22, 2021.
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