Hello Mako, I replaced the Sovteks with Reflectors in my T10 RB. I thought it was a worthwhile switch. They added some detail and air, solid bass too. Seemed to compliment the Synergy Double 240 I was running when I made the change. They sound great with the new SET 400 as well. It's likely you will hear the difference regardless of your choice of tubes. You can find a few comparative websites for guidance but really just have to try them out. I got the Reflectors from the TubeStore, Upscale Audio has an interesting selection too.
