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12AT7

Sensibly equivalent to:
6060 B152 B309 CV455 E2157 ECC81
See also:
Valves and their Habits - Pin Compatible Double Triodes - Brimar FM Valves Advert - Brimar 12AT7 Advert - Brimar 12AT7 Advert - Mufax Chart Recorder Maintenance Manual - Brimar 12AT7 Advert
    
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The 12AT7 double triode is equivalent to the Mullard ECC81. This type of valve was designed for RF use and is of the low impedance type.
This valve is marked as Foreign Made. The envelope is the same diameter as the ECC83 made in the GDR and this may be the location of the manufacturer. Note also the bright support strut for the getter.
This is another Brimar 12AT7, but this time an original British made valve.
The British valve seen end on to the anodes. The getter support is an extension to one of the anode supports and will provide some extra heat sinking.
The thin glass tube envelope is 21.5 mm in diameter and excluding B9A base pins the length is 47 mm.
References: Datasheet & 1040. Type 12AT7 was first introduced in 1947.

 

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 August 06, 2016.
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