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B5

 
See also:
The Dawn of Broadcasting in the UK - BTH B5 Advert - BTH Range Advert
    
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The B5 triode is from the mid 1920s and is marked with the BBC stamp. The base is B4 and the filament required 3 Volts. The envelope is opaque an no details are visible above the pinch.
The balloon envelope is 35 mm in diameter and, excluding the B4 base pins, is 83 mm tall.
Reference: 1003. Type B5 was first introduced in 1923.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.8
0.06
80
-4.5
?
17000
0.41
Updated May 17, 2015.
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