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XFY10

 
    
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The XFY10 is 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 valve is the lowest power audio output valve we have seen at three mW. This power would be suitable for sensitive ear phone use only.
The thin glass tube envelope is oval in section 9 mm by 5 mm. The length excluding B5A wires is 38 mm.
Reference: 1040. Type XFY10 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
gm
Pout
1.4
0.025
22.5
22.5
-1.25
0.5
0.2
0.35
0.003
Updated March 10, 2013.
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