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954

Sensibly equivalent to:
CV1095 CV1579 VR95 ZA2
See also:
The Famous EF50 of WWII - A datasheet for the 956 - Acorn Antiques - CV1095 short entry
    
Extras ▼

 

The 954 miniature all glass acorn valve is a pentode with a 6.3 Volt heater. Visual inspection shows the three grids within the anode cavity. In 1943 in America the 954 was re-worked onto the B7G base and issued as the 9001.
The normal 5 side pins are supplemented by pins top (a) and bottom (g1) making seven contacts in all.
The small size of these valve enabled them to operate at VHF.
The valve is marked JRC954, the JRC marking being a US Government quality code.
The RCA logo and lower shield.
The main horizontal pins sealed into a thickened ring of glass. The pushing down on the valve to get the five pins into the slots in the special base would often crack the glass and thus ruin the valve.
The wire grids can be seen through the gap in the anode. The anode connection is on the right with the base connection at the other end going to the control grid.
Another view. The control grid is wound on copper supports.
The acorn envelope is 13 mm in diameter and, including the base pins, is 44 mm tall.
References: Datasheet. Type 954 was first introduced in 1935.

 

Pin Connections
1
2
3
4
5
bc
tc
h
g2
g3
h
k
g1
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
μ
6.3
0.15
250
100
-3.0
1.2
0.5
1.0M
11.0
1100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 18, 2015.
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