ECL80 Pentode Part

All tube operating points below are by no means definitive good sound recipe for your particulate tube project. Lowest THD point is not necessary best sounding one and there is always some variance even in a NOS tube batch from the same manufacturer!  Below information is only useful as a general starting point and is ment to get you in a ballpark when no measurement equipment is available.

Lowest THD operating point spectrum

8.5mA, -18.5V BIAS

Other operating points

20mA, -5V BIAS

Traced plate curves


Pentode linearity leaves much to be desired, spectrum is quite dirty. Not microphonic. Good enough for cathode follower. Available for sale.

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