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ECC81

Sensibly equivalent to:
12AT7 B152 B309 CV455 E2157 E811CC
See also:
Valves and their Habits - Pin Compatible Double Triodes
    
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The ECC81 was designed for RF use and is of medium impedance.
Here we have a Zaerix device made in what was then East Germany and given as Made in GDR. The direct equivalence between the 12AT7 and ECC81 is made clear.
The reverse of the envelope.
The thin glass tube envelope is 21 mm in diameter and excluding B9A base pins the length is 48 mm.
References: Datasheet & 1040.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(2)
g1(2)
k(2)
h
h
a(1)
g1(1)
k(1)
hct

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.6
250
-2.0
10.0
10,000
5.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 31, 2016.
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