This was my question to them:
And their answer:
I agree that it’s a great sounding preamp, especially when you roll the tubes.
Is there any benefit (or harm) to keeping the Freya + powered up all the time (obviously with tubes turned off when not in use)? I’ve heard various people offer opinions about this and I wanted to see if there was an official stance on this.
And their answer:
If the Freya + is on, the tubes will still have current going through them, and the tube life will still be diminished faster. It is OK to leave it on all the time, but we suggest turning it off for the life of the tubes.
I agree that it’s a great sounding preamp, especially when you roll the tubes.