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1909A

Sensibly equivalent to:
CV2291
    
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The Philips 1909A barretter is a current stabiliser on a B4 base but pin 2 is omitted. The current stabilised is 1.15 Amp and the working voltage range is between 10 and 30 Volts. At 20 volts the tube current is between 1.08 and 1.22 Amps.
The identification is etched into the side of the envelope.
A closer view of the pinch, central glass pillar and the iron wire filament.
The balloon envelope is 52 mm in diameter, and excluding the B4 base pins is 110 mm tall.
References: Datasheet.

 

Pin Connections
B4
1
2
3
4
-
-
f
f

 

Absolute Maximum Operating Conditions
Stabiliser
Ah
1.15
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 10, 2017.
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