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ECL82

Sensibly equivalent to:
6BM8 6PL12
See also:
The Stereoplex Amplifier
    
Extras ▼

 

The ECL82 is described by Brimar as an audio triode plus beam tetrode.
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 triode is on the left and the grid can be seen to be wound on copper rods.
Below the lower mica, and above the top mica, the copper support rods for the output section control grid can be seen. At the top of the valve the getter holder ring can be seen to have a square sided channel that once held the getter chemicals.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins the valve is 71 mm long.
References: Datasheet & 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 October 28, 2015.
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