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43

Sensibly equivalent to:
A2543 CV2514 ER43
    
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The 43 UX6 based audio output pentode is electrically identical to the IO based 25A6. The valve is rated for use in low power single ended output stages. This suggests that it was for use in the output stages of receivers.
The classic envelope is 43 mm in diameter and, excluding the UX6 base pins, is 101 mm tall.
References: Datasheet, 1040 & 1043. Type 43 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
Pout
D
25
0.3
160
120
-18
36
12
42,000
2.4
2.2W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 28, 2013.
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