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 and recommended operating point spectrum

3mA, -1.5V BIAS

Other operating points

 2mA, -1.7V BIAS

Traced plate curves


Clean spectrum and usable for audio (similar performance to 12AX7), but probably better left for those old radio restorations, where this tube works as detector. Available for sale.

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