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UX201A

Sensibly equivalent to:
201A
See also:
Cymotron UX201A Box
    
Extras ▼

 

The UX-201-A is a battery triode designed for detector or amplifier use. The filament is designed for use with a lead-acid accumulator, and a series rheostat.
The envelope is silvered inside the glass and no internal structures are visible.
The base carries the name Cymotron and the Type designation. The valve looks to be of Japanese origin as can be seen on the box and the logo on the dome. The logo in the image is on its side.
The balloon envelope is 45 mm in diameter, and excluding the UX4 base pins is 99 mm tall.
Reference: Datasheet. Type UX201A was first introduced in 1922.

 

Pin Connections
UX4
1
2
3
4
g1
a
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
5.0
0.25
135
-0.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December27, 2014.
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