I really do not have benchmarks, but it has a gain equivalent to the Sovtek 6L6 WXT + 6L6 Another widely used in many amplifiers.
It makes the job well, the sound is right, no background noise and good dynamic (Santana is a fan!).
Contrary to previous opinion, it does not heat up too. This requires checking the mains, because actually, if the head is set to 220 V while the sector is 240 V, the lamp will shine a thousand lights! Once the amp set to 240 V (this is the case with my Peavey 6505 + with a switch 220/230 V & 240 V), the lamp operates in a normal diet and do not get too hot.
Very good light amplification (Chinese and sorted by Ruby) at a price after all, very honest.
I might be other things to say when I changed the lamps by others (JJ / Tesla Tung Sol, Svetlana, EH etc.).. In the immediate future, it does!