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, -3.4V BIAS

Recommended operating point spectrum

11mA, -6.5V

Other operating points

14mA, -1.7V
12mA, -5V BIAS
8mA, -3.4V BIAS
5mA, -5V BIAS

Traced plate curves

THD statistics


Miniature version of almost cult-like 6SN7GTB with a shield between triode sections. One of the most linear triodes out there. Really clean spectrum at optimum BIAS point with pure 2nd harmonic. Sounds really wonderful!

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