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.
Very decent looking pentode, just don’t push it more than 6mA. Little microphonic and prone to oscillate if wiring is loose, but can be tamed easily. Sounds sweet with 2-3 red LED bias at ~3-4mA current. Available for sale.