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12AU7

Sensibly equivalent to:
6067 B329 CV491 E2163 ECC82
See also:
Valves and their Habits - Pin Compatible Double Triodes
    
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The 12AU7 is a double triode with separate cathodes. An amplification factor of 17 is quoted. The 6C4 is half of the 12AU7.
Unlike our other 12AU7 exhibits this envelope is very rounded at the top. It is marked as British made but was it made by STC in a Brimar factory?
The twp part stitched anode with connection welded to one of the support tabs.
The heater passes four times through the cathode tube.
The thin glass tube envelope is 20 mm in diameter and the length excluding the B9A base pins, is 47 mm.
References: Datasheet & 1040. Type 12AU7 was first introduced in 1951.

 

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
gm
6.3
0.3
250
-8.5
10.5
2.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 18, 2019.
shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.a(2) pin:2.g1(2) pin:3.k(2) pin:4.h pin:5.h pin:6.a(1) pin:7.g1(1) pin:8.k(1) pin:9.hct
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