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505AX

 
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Subminiature Valves
    
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Miniature wire ended valves, like the 505AX were developed in WWII for military use, and for hearing aids.
This valve could have found use as the first stage of a hearing aid.
The thin glass tube envelope is an oval tube 9 x 7 mm, and excluding the wire leads is 30 mm tall.
Reference: Datasheet.

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
0.625
0.03
22.5
22.5
-1.25
0.2
0.08
2M
0.15
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 26, 2013.
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