Which 12AX7 Tube?

I am interested in getting new tubes for my Antique Sound Labs MG Head OTL amp. I bought the amp with the other tubes already replaced, so I only need a new 12AX7 tube. So what should I get? Thanks
I've tried many 12ax7 in my Quicksilvers (m60) - Electro Harmonics (edgy & noisy), chinese, some amperex (i think) but - The best sounding were some old Telefunkens. Difficult to reccomend without knowing your system- Trial & error
For the price I love svetlanas. Golden Dragons are nice too for new tubes.
Try to get a Sylvania black plate 5751 for the center tube. It's the best I have heard in mine.