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B3

 
See also:
BTH B3 Box
    
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The BTH B3 is a dull emitter triode designed for general purpose applications. The electrode assembly is vertically mounted and the filament is a single strand of thoriated tungsten wire. Our exhibit has the filament intact and powers up to a bright orange glow.
This exhibit shows the getter as milky but not pure white and this suggests that the valve is 'soft' ie there is gas in the envelope.
The plated base shell is bright with no signs of pitting.
The electrodes were difficult to photograph through the milky envelope.
The balloon envelope is 37 mm in diameter, and excluding the B4 base pins is 90 mm tall.
References: 1003 & 1004. Type B3 was first introduced in 1924.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
1.8
0.35
80
-3
-
27k
0.28
7.5
Updated March 12, 2015.
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