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P414

Sensibly equivalent to:
B405 RE114
    
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The P414 from Tungsram is an audio output triode designed to give 200 mW of output with a load of 4,500 Ω.
The interesting aspect of this exhibit is the lettering on the dome. Visually on sees it as this picture. P414 4V 150V.
The camera recorded the dome as this image with mainly yellow lettering and a clear set of three numbers - 210.
The photograph reveals the dome lettering as Tungsram Barium Valve and the Type is LG210. This is a two volt valve and not a four volt output triode.
The balloon envelope is 47 mm in diameter, and excluding the B4 base pins is 88 mm tall.
Reference: 1043. Type P414 was first introduced in 1929.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
4.0
0.15
150
-16.0
12.0
1,700
2.8
Updated January 17, 2018.
shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:4.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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