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4101DS

 
    
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The 4010D is the STC version of the Western Electric 101D telephone repeater triode from 1925. Here we have a 4101DS and can find no information on this variant.
The filament is oxide coated.
The original 101D was introduced in 1921 and was still in production, in an improved form, until the 1950s.
The first 5,000 401Ds were made with a seamed nickel base shell. This exhibit has a seemless shell and is thus later. In 1946 STC replaced the 4101D with the 3A/141A.
The main glass support is fractured and the electrodes tilted.
The construction appears to be identical to the 4101D.
The pinch and fractured glass rod. The filament is a ribbon and the grid is of the ladder type.
There are two grids and anodes, one set per side of the central filament. The anode is a thin flat sheet held at four points.
The balloon envelope is 59 mm in diameter, and excluding the base pins is 96 mm tall.
References: Datasheet & 1047

 

Pin Connections
UV
1
2
3
4
g1
f
f
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
4.5
1.0
190
-20
12.0
5,600
1.07
6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 11, 2014.
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