Ya, I have a Sophia Electric 6SN7 and 6SL7. They're basically a copy of the Fullmusic 6SN7. Not a fan myself (for the price), I think the Psvane or Shuguang are better as far as expensive new stock goes.
There is cheap new stock for 6SN7 (Tung-Sol / Electro-Harmonix / JJ etc..) I tried the JJ / Electro-Harmonix and they weren't great.
That Psvane is so huge I doubt you can fit in in to the Freya/Saga's chassis.