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Unknown

 
See also:
Dario Range Advert
    
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This exhibit has lost all identification. The style of the base cap and envelope all indicate a Dario product from the 1920s. The Universal Bivolt looks identical.
The anode is horizontal and the four visible supports are typical of triodes of the period with a single V for the filament. Powering the filament at 1.8 Volts gave a consumption of exactly 0.1 Amp. Looking at the advert gives only two possible Types - Universal or Resistron.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 87 mm tall.
References: Observation and test.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
1.8
0.1
Updated November 20, 2017.
shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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