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2A5

Sensibly equivalent to:
CV1834
    
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The 2A5 is an audio output valve. With different heater ratings and bases the 6F6 and 42 are electrically equivalent to this 2.5 Volt pentode.
The paper band around the top of the glass reads Quality Approved - Special Export Test.
The inner grids: copper supports with heat radiating fins for the control grid.
The classic envelope is 44 mm in diameter, and excluding the UX6 base pins is 101 mm tall.
References: Datasheet & 1043. Type 2A5 was first introduced in 1932.

 

Pin Connections
UX6
1
2
3
4
5
6
h
a
g2
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
rk
rl
Pout
2.5
1.75
250
250
-16.5
34.0
6.5
0.1M
2.2
-
7,000
3W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 15, 2019.
shape:classic construction:pinch type:pentode age:1930.1940 base:ux6 heater:2.5v pins:6 pin:1.h pin:2.a pin:3.g2 pin:4.g1 pin:5.k pin:6.h
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