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ECL82

Sensibly equivalent to:
6BM8 6PL12
See also:
The Stereoplex Amplifier - A Valve Power Supply - A 3 Valve 9 Watt Amplifier
    
Extras ▼

 

The ECL82 is described by Brimar as an audio triode plus beam tetrode. Unusually STC, the owners of the Brimar brand, have their logo on the glass.
The triode section has a amplification factor of 70, and this valve was much used in record players with crystal pickups. The latter had a relatively high output and when coupled with the single ended pentode output stage made effectively a single valve design. Only a rectifier was required to complete the line-up.
The gettering has vanished and this is probably a defective valve. However, it does allow a view of the getter holder.
The control grids of both sections are wound on copper supports. The screen below the lower mica shields the triode anode connection.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins the valve is 69 mm long.
References: Data-sheet & 1040. Type ECL82 was first introduced in 1956.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g1(t)
k,g3,S
g1
h
h
a
g2
k(t)
a(t)

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
gm
6.3
0.78
200
200
-16
35
6.4

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
gm
100
3.5
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 21, 2020.
shape:thin.glass.tube construction:all.glass type:triode.pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.g1(t) pin:2.k.g3.s pin:3.g1 pin:4.h pin:5.h pin:6.a pin:7.g2 pin:8.k(t) pin:9.a(t)
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