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D-1

 
    
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The Philips D-1 dates to 1920-21 and is a bright emitter triode. The basic operating details are written on the glass as is the fact that it was imported from Holland.
The anode cylinder has a flange at the base that connects to two supports anchored in the pinch.
The grid is fixed to the support along one edge. The filament is clamped into a fold in the support.
The single strand tungsten filament is still in place.
A closer view of the electrodes.
The wide glass tube envelope is 30 mm in diameter, and excluding the B4 base pins is 69 mm tall.
References: Observation & 3002. Type D-1 was first introduced in 1920.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
3.5
0.5
20-25
Updated October 28, 2014.
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