Summary
The ECL82 is an audio triode plus output pentode.
History
Developed by Mullard in the late 1940s, the ECL82
was extremely popular with small equipment manufacturers in the late
1950s and early 1960s, especially those making record players using
crystal pickups. As this type of pickup had a relatively high output
they could be coupled with the single ended pentode output stage and
effectively create a single valve design with only a rectifier required
to complete the line-up.
Application
In larger hi-fi amplifier circuit designs, the triode sections
acted as a phase splitter while the pentodes were arranged in a push-pull
output stage with distributed loading. In this arrangement, approximately
7 watts per channel could be obtained.
Predominantly the tube is limited to British and European
designs although the US equivalent 6BM8 can be found in low-powered
American guitar amplifiers.
Classic amps using the ECL82
Mullard 7-watt stereo, Avantic SPA-11, Armstrong A6
B.K. Partners A205, Pamphonic 3001, Revox Model 40
Knight KG-250
Current Production
Svetlana, Electro-Harmonix
Current prices
Both new and NOS items seem to range between $12-25 each. Vintage matched
quad sets can fetch up to $150.
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