If I don't mistake I believed I bought your Sylvania tube from Canuckaudiomart.com when you sold your MAD.
@Focker, and who said I have to choice between the two . I might as well keep both.
The thing about tube is this weekend I was listening to the new album from Norah Jones and didn't like the sound I was getting with the MAD / T1. I decide to roll the tube and install a NOS Telefunken with higher gain and voila. The synergy was back to was I was expected.
For Grados, I did prefer the 5751, but for the T1s, I did prefer the 12AX7 (with 30% more gain).