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UD2

 
See also:
Triotron UD2 Box - Range Advert
    
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The UD2 is an audio output triode. Triotron describe it as a Super Power type at a time when a quarter of a Watt could seem loud.
The first set of operating conditions relate to its introduction in 1927 and the second set to the improved version from 1933.
Triotron made a series of output valves with various power output ratings. ZD2 had the lowest power rising to SP2 with the greatest. The series was: ZD2, UD2, YD2 & SP2. A similar series existed for four volt valves.
The silver gettering obscures all of the internal structure.
The balloon envelope is 48 mm in diameter, and excluding the B4 base pins is 86 mm tall.
References: 1043 & Advert Type UD2 was first introduced in 1927.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
rl
Pout
2.0
0.22
180
-22
15.0
3,000
1.8
,7,000
0.27

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
ra
gm
rl
Pout
150
-15
15.0
2,700
2.0
5,000
0.5
Updated February 26, 2011.
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