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ECL82

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

 

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 serice.
This exhibit has the earlier Mullard logo than ECL82.
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. In the similar PCL82 form with 300 mA heaters this valve was a most popular choice for the audio stages of domestic television receivers.
The triode is the same height as the pentode on its left. The earlier ECL80 had a single cathode and a small triode and the later ECL86 has a much smaller triode, in fact the triode from the ECC83.
The triode face view. Note the copper grid support rods.
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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