▼ Menu

Unknown

 
    
Extras ▼

 

This exhibit has ny Type designation visible. The envelope has etched into it the Union Flag and the words British Standard.
The feint etching.
A slightly clearer view of the flag and wording.
The base with simple split-pins.
The filament is a single inverted V. The support for the filament tension spring is the rod close to the left hand leg of the filament.
The balloon envelope is 46 mm in diameter, and excluding the B4 base pins is 93 mm tall.
Reference: Observation.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Updated May 16, 2019.
shape:balloon construction:pinch type:triode age:1920.1930 base:b4 pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
Return to Main Index