I have the Modwright tube Oppo 83 and it uses a 5AR4 in the power supply unit. I'm using a vintage Mullard and really enjoy the sound. I haven't done much tube rolling. All the recent posting about Create's rectifier tube sure has got me curious about how it would sound. I like the idea of getting out of vintage tubes due to raising prices and increasingly harder to find.
For the 6SN7 tubes in my Oppo I had some amazing sounding NOS Sylvania's and then tried some new stock Sophia Electric and never looked back. They were way more open, dynamic and lively than the nos I had.