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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 BTH B5 is a triode that was first released in 1923. It is a general purpose valve and has an μ of 7. The filament rating of 2.8 Volts was chosen so that the valve could be heated by two dry cells in series.
Unlike our other two B5 & B5 exhibits this one has a slightly transparent coating that reveals the inner electrode structure. The vertical anode is of small diameter with the single strand filament at its centre.
In 2010 another B5 with a clear side to the envelope has been found. The anode is revealed as a long thin cylinder.
The glass bead insulator is held in place by a rod to the pinch
The grid is held to a single support. The filament is a single central strand.
The balloon envelope is 38 mm in diameter and, excluding the B4 base pins, is 88 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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