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XFW10

 
    
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The XFW10 is a very small wire ended pentode and very probably was designed for hearing aid use. The 22.5 Volt anode specification fits with the small dry cells available.
The filament voltage of 0.675 is half the dry cell voltage of 1.4 Volts so enabling a pair of valves to operate in series across the filament battery.
The wire pattern is known as a B5A base.
The thin glass tube envelope is oval in section 9 mm by 5 mm. The length excluding wires is 30 mm.
Reference: 1040. Type XFW10 was first introduced in 1949.

 

Pin Connections
B5A
1
2
3
4
5
a
g2
f+
g1
f-,g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
0.0675
0.025
22.5
22.5
-0
0.2
0.01
1M
0.18
Updated March 10, 2013.
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