6K13P (6К13П)

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

12mA, -1.7V BIAS

Other operating points

6.5mA, -3.4V BIAS

Traced plate curves


Seems to be a vari-μ pentode, not really suitable for audio without some sort of feedback mechanism.

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