ECL86 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

10mA, -11.55V BIAS, 265Va

Recommended operating point spectrum

 20mA, -9.5V BIAS, 260V

Other operating points

 40mA, -5.38V BIAS, 215Va
30mA, -9V BIAS, 270Va 
 2.5mA, -8.85V BIAS, 175Va

Traced plate curves


Linear pentode with a clean spectrum (similar to EL41). Very usable. Available for sale.

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