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40

Sensibly equivalent to:
CV2501
    
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The Type 40 is a high-μ triode for use in amplifier or detector circuits.
The Philco company name on the base cap.
The valve arrived complete with the original box - albeit in poor condition with the ends missing. The box is 60 mm square and 125 mm tall.
The balloon envelope is 45 mm in diameter, and excluding the UX4 base pins is 97 mm tall.
Reference: Datasheet.

 

Pin Connections
UX4
1
2
3
4
f
a
g1
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
5.0
0.3
180
-3.0
0.2
150k
0.2
30
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December24, 2016.
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