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ECC81

Sensibly equivalent to:
12AT7 B152 B309 CV455 E2157 E811CC
See also:
Valves and their Habits - Pin Compatible Double Triodes - Double Triodes in Audio Amplifiers Advert - Noval Based Valves for Audio Amplifiers Advert
    
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The Mullard ECC81 was designed for RF use and is of medium impedance.
It was used as a frequency changer in five station television sets. In this application the oscillator triode would be the first to cease working.
The ECC81 also makes an excellent phase splitter in modern audio applications.
This exhibit is British Made and carries the older Mullard logo as well as the BVA logo.
The folded anode is stitched on one side only and secured by tabs that fit into slots in the mica discs. The connection is welded to the tab.
This is a standard consumer valve but features double micas that are usually found on valves designed for operation in environments subject to vibration and/or shock ie aircraft.
The thin glass tube envelope is 20 mm in diameter and excluding B9A base pins the length is 49 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
0.3
250
-2.0
10.0
10,000
5.5
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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