Back when I had a Lector 0.6T CDP I found that the Telefunken ECC801S offered the best tonal balance and most coherent presentation. The other 12AT7 type I tried was a 6201 Sylvania Gold Brand which is nice for that application but I found the Telefunkens better to my taste with a bit more detail and extension. Noticeably better with massed instruments in orchestral music with better focus and separation. Hope this helps.
