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ECL82

Sensibly equivalent to:
6BM8 6PL12
See also:
The Stereoplex Amplifier
    
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The ECL82 is described by Mullard as an audio triode plus output pentode. The design use was for television frame oscillator and output stage as well as audio. The frame oscillator would place greater demands on the triode than audio service. This exhibit is a generic product without a maker's name.
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 similar PCL82 with 300 mA heaters, for series heater chain use, was a most popular choice for the audio stages of domestic television receivers before the ECL86 and PCL86 appeared in 1961.
The pentode with a fan shaped screen above the top mica.
The triode on the left has the same height as the pentode. The later ECL86 design incorporated the small ECC83 triode section.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins the valve is 69 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 January 20, 2017.
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