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BD9

 
See also:
Fotos BD9 Box - Fotos BA9, BC9 & BD9 Advert
    
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The BD9 is a 'Super Power' battery triode from Fotos. The Fotos brand is a brand name of the French Grammont company but was made in the UK.
This image of the dome has been enhanced to show the etched lettering. The filament voltage and current are also etched into the dome.
The BD9 type designation on the dome.
The horizontal box anode. The grid is just visible at the top of the picture.
The pinch showing the stout support wires for the electrodes.
The balloon envelope is 43 mm in diameter, and excluding the B4 base pins is 76 mm tall.
Reference: Valve Box, Advert & Observation. Type BD9 was first introduced in 1929.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
2.0
0.32
Updated February 13, 2013.
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