Shuguang 12AX7B Silver Dragon
Made at Shuguang factory in China, 12AX7B has higher gain than other 12AX7 types while staying very low noise.
If you are looking for maximum gain and shredding power, this is the 12AX7.
Shuguang 12AX7B is sometimes labeled as 12AX7, but it's the same tube. Please note that recent version of 12AX7B comes with grey coating on anode.