Tube pre for class d recommendations

A Freya pre-amp used ahead of a Merrill Audio Taranis Class D power amp sounds great to me.  The Freya (4-6SN7s) replaced an Opera Reference 50 (dual-6H30/EZ80-rectified) pre-amp. Both pre-amps worked just fine but the sound with the Freya is more refined...detailed but relaxed at the same time.  

The Freya is very flexible offering singled ended and balanced inputs and outputs as well as pure passive, JFET buffered, and tube gain output modes.  It's very transparent and readily shows differences in tubes and interconnects.  It is also being used with a First Watt F7 amp and a Hegel H200 integrated when used as power amp.  

What sorts of things related to use with Class D are you wondering about?

I’m very pleased with the Freya, Owen. Had it a couple of years now (3?) and no problems. You can spend more, you can buy better but at $700 it is a solid bargain. 5 year warranty and there’s a 15 day money back return option (less 5% restocking and shipping costs) if you don’t like it.

The first (and maybe even some of the second set) NOS Russian tubes that were supplied with the Freya were a little noisy. Schiit replaced them promptly no problem, though now running NOS American tubes. Other than occasional tube noise on rare occasions, the unit is very quiet. Volume full up with nothing playing there is NO noise at the speakers...ear 2" from the tweeter, etc. The resistor ladder type volume control does click when you change volume settings but I’ve heard the same from a Conrad Johnson pre I auditioned.

Other than ensuring impedance compatibility, as Atmasphere mentions [ensure load impedance of amp is at least 10x (some say 20x) output impedance of preamp] I don’t know any reason a Class D amp wouldn’t work with a will-chosen tube pre-amp.

As for everything audio, there are always haters. Wolf Garcia is another Freya user and advocate. Check out some of his posts on the topic. Good luck.