I've had a Freya + now for almost two weeks now, and I am very impressed with this amp. I have only listened to the Freya + in the JFET differential buffer mode and in the tube differential mode. In my opinion, both modes sound great with my preference for the tube mode when I am actively listening. When I want some background music, I switch the Freya + into the JFET buffer mode. I love the fact that when I switch from tube mode to JFET buffer mode, the tubes power down.
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I hate to admit it, but I enjoy using this preamp more than my Audio Research LS7 tube line stage, and my ARC LS7 has set a high bar. This is how impressive the Freya + is to my ears. With full balanced connections from my SMSL SU-8 v. 2 DAC to the Freya + to the Pass DIY Aleph J Class A power amp, the huge soundstage has a black background. I hear nuanced details and tone in recordings I have never heard before--it really is amazing to me that this preamp is less than $900 and comes with a 5-year warranty.
I installed two matched OS GE gray plate side FAT D getter 6SN7GTB tubes in the differential voltage gain positions (right side) and two new production Tung Sol 6SN7 tubes in the output buffer positions (left side). The Freya + shipped with a quad of JJ 6SN7's, but I went with this combination from the start. The presentation is clean, holographic and rich in tone. In either mode I've used, the bass is nicely defined and taut. I do not hear any boomy or flabby bass at all.
This is my first piece of Schiit gear, but now I am wondering about a Bifrost Multibit as an upgrade to my SMSL SU-8 v. 2 DAC.