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12AT7WA

Sensibly equivalent to:
6060 6201 CV4024 E81CC M8162
See also:
Pin Compatible Double Triodes
    
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The 12AT7WA is a special quality version of the ECC81 VHF double triode and this is an unbranded example. The envelope has the Type designation etched into it plus a printed ECC81 SQ.
These valves are useful for RF stages, oscillators and frequency multipliers.
The twin triodes separated by space and not by a screen. Note the double mica discs, this double thickness was found to be effective in reducing the effects of vibration.
Each anode is folded into a box with a side flange. The flanges are then stitched together. The outer surface has been treated with carbon to aid heat radiation.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 48 mm long.
Reference: Data-sheet. Type 12AT7WA was first introduced in 1961.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
170
-1
8.5
11k
5.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 14, 2020.
shape:thin.glass.tube construction:all.glass type:double.triode age:1940.1950 base:b9a heater:6.3v pins:9 pin:1.a pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.a pin:7.g1 pin:8.k pin:9.hct
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