Trelja's response in a pm....
Yes, the 5751 sound the best of any variant, with the Sylvania triple mica black plate at the top of the heap. I wholeheartedly recommend them. Some will mention they have lower gain than a 12AX7, and if memory serves me correctly, I think that I did notice that in the JOR, which may keep you from using them in that application.
Believe it or not, the triple mica Shuguang 12AX7B, that regularly sell for $10 - $20 is one of the best sounding variants you can buy, and supplant a lot of the old standards, including Mullard. In my estimation, they're truly a no-brainer, so if you don't want to pay 5751 prices or don't want to absorb any loss of gain, I suggest you give them a try. I think you'll be quite happy with them.
Yes, the 5751 sound the best of any variant, with the Sylvania triple mica black plate at the top of the heap. I wholeheartedly recommend them. Some will mention they have lower gain than a 12AX7, and if memory serves me correctly, I think that I did notice that in the JOR, which may keep you from using them in that application.
Believe it or not, the triple mica Shuguang 12AX7B, that regularly sell for $10 - $20 is one of the best sounding variants you can buy, and supplant a lot of the old standards, including Mullard. In my estimation, they're truly a no-brainer, so if you don't want to pay 5751 prices or don't want to absorb any loss of gain, I suggest you give them a try. I think you'll be quite happy with them.