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6AT6

Sensibly equivalent to:
6066 CV452 DH77 EBC90
See also:
The 'Magic Three' Valves - The Neophyte Amplifier - A SE 2E26 Audio Amplifier - Simplex Stereo Re-Visited
    
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The 6AT6 amplifier triode with double diodes sharing the same cathode connection was designed for use in superhet receivers as detector, AGC rectifier and first audio amplifier.
The triode is close to half an ECC83 and works well as an audio voltage amplifier.
The twin bright arch pieces that are the diode anodes are a defining visual feature of the 6AT6. The CBS logo.
These look like after market stamps.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Data-sheet, 3002 & 1040. Type 6AT6 was first introduced in 1946.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k
h
h
a(d2)
a(d1)
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-3
1.0
58,000
1.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 27, 2020.
shape:thin.glass.tube construction:all.glass type:double.diode.triode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.a(d2) pin:6.a(d1) pin:7.a
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