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1904

 
    
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The 1904 is a current stabiliser for use on series heater chains running at 100 mA. The current is stabiles vro voltages across the tube of 30 - 80 Volts.
The lettering is the Type designation, Philips and Made in Holland.
The thin iron wire is looped around the envelope.
The wide glass tube envelope is 36 mm in diameter, and excluding the B4 base pins is 90 mm tall.
Reference: Datasheet. Type 1904 was first introduced in 1928.

 

Pin Connections
B4
1
2
3
4
-
-
f
f

 

Absolute Maximum Operating Conditions
Stabiliser
Vh
Ah
30-80
0.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 10, 2015.
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