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D15

Sensibly equivalent to:
CV1539
    
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The D15 is a current stabilising barretter. The current remains sensibly constant at 150 mA for voltages within the range 90 to 140. The barretter functions only within a series heater chain. The cold resistance is 240Ω.
At this magnification the The filament looks to be is a single strand looped over the supports. Traditionally the wire is iron and the low pressure gas inside the envelope is hydrogen.
A closer look reveals the filament to be a coil.
Here the coiled filament is clearly seen.
The wide glass tube envelope is 39 mm in diameter, and excluding the IO base pins is 77 mm tall.
References: Datasheet, 1040 & 1043.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
h
-
-
-
-
-
h

 

Absolute Maximum Operating Conditions
Stabiliser
Va
mAa
90-140
150
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 03, 2018.
shape:wide.glass.tube construction:pinch type:barretter age:1940.1950 base:io pins:8 pin:1.- pin:2.h pin:3.- pin:4.- pin:5.- pin:6.- pin:7.- pin:8.h
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