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12A6

Sensibly equivalent to:
12A6Y CV525 VT-134
    
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The 12A6 was designed for use as a single end audio output stage for radio receivers. The Ferranti details give a cathode resistor of 375 Ω and a load resistance of 7,500 Ω. The original design was American.
The reverse of the envelope is plain.
The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 67 mm tall.
References: Datasheet & 1040 Type 12A6 was first introduced in 1942.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g1
-
h
k

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
12.6
0.15
250
250
-12.5
30
3.5
70k
3.0
2.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 30, 2016.
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