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955

Sensibly equivalent to:
CV1059 HA2 VT121
See also:
The Famous EF50 of WWII - CV1059 short entry
    
Extras ▼

 

The acorn valves were designed to have low capacitances and therefore work to higher frequencies than the normal valves. The 955 triode was introduced in 1934, and has a 6.3 Volt heater.
The valve is marked JRC955, the JRC marking being a US Government quality code.
The 955 was later re-issued on a B7G base as the 9002.
Radio amateurs used acorn valves for work at 144 MHz after WWII.
The base end showing the five pins and within the round cathode, heater and control grid copper supports.
Made in USA.
The acorn envelope is 14 mm in diameter and, including the base pins, is 33 mm tall.
References: Private Communication & data-sheet. Type 955 was first introduced in 1935.

 

Pin Connections
1
2
3
4
5
f
a
g1
f
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.15
250
-7
6.3
11,400
2.2
25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 08, 2020.
shape:acorn construction:all.glass type:triode age:1930.1940 base: heater:6.3v pins:5 pin:1.f pin:2.a pin:3.g1 pin:4.f pin:5.k
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