The addition of a couple NOS Sylvania GTA 6SN7 tubes really made my Schiit Freya+ perform beautifully. It doesn't seem to matter what tubes are in the buffer stage. I think I have Tungsol or Electro Harmonix. A Chinese brand Shuguang have sounded very good in the Freya. These things are tall and have a "Belted" shape for lack of a better term. My Sylvanias were $100 for a pair.
