PFL200 L (Output) Pentode

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

15mA, -6.4V BIAS, 260Va

Recommended operating point spectrum

20mA, -6.1V BIAS, 260Va

Other operating points

5mA, -7.2V BIAS, 260Va
 25mA, -5.8V BIAS, 260Va

Traced plate curves

THD statistics


Excellent Pentode! (=EFL200/6Y9). Extremely linear and has a clean spectrum. Just look at those beautiful curves, very wide linear region. Another magnificent sleeper tube. Available for sale.

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