PCF200 Triode 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, -0.98V BIAS, 178Va

Recommended operating point spectrum

7.5mA, -1.1V BIAS, 155Va

Other operating points

5mA, -1.44V BIAS, 150Va
2.5mA, -2.26V BIAS, 160Va

Traced plate curves

THD statistics


Interesting tube. Curves would suggest excellent linearity, but measurements shows some traces of  higher harmonic content. And this is consistent with all 3 examples I have. Still very usable. Available for sale.

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