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NR94

Sensibly equivalent to:
AC/P4 AD/P4 CV1198 W2529
    
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The NR94 is an indirectly heated triode based on the AD/P4. The design purpose was for line scanning in TV circuits. This valve is marked with the old Navy Receiving code of NR94. Later it was renamed the CV1198.
CV1190 refers to a pair of CV1198s selected such that with 1.0 kV on the anode, with a 100kΩ anode load and an anode current of 4.75 mA, the control grid voltages are within half a volt of each other.
The triode is 3.5 mm front to back.
The anode is much wider than the grid providing extra area for radiating heat away.
The control grid is fitted with a substantial heat sink.
A closer view of the top components and flat sided cathode tube.
The classic envelope is 39 mm in diameter and, excluding the B5 base pins, is 111 mm tall.
Reference: Data-sheet.

 

Pin Connections
B5
1
2
3
4
5
tc
-
g1
h
h
k
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
4.0
1.1
700
-
-
2,800
7.0
20
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 05, 2021.
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