Using digital preamp to tube power amp questions

Thanks, that's good to hear. A friend has his eye on a used Cary SET for me (don't know the model yet) that it looks like I'll be able to audition in my home. I'll post the results. Also, I've pretty much decided that I'm keeping the 3a's in my system, anyway, whichever amp I decide to go with.

I just got some info on the amp. If my understanding is correct, it essentially consists of a single chassis housing two Cary 300 SE monoblocks. I'm not at all familiar with tube specifics nor do I know the model number of the dual mono-block unit but from the little I've been able to read, it sounds like a pretty competent amp. Id appreciate any comments.

Czarivey, input sensitivity for the 300SE is 0.75V for full output. The best I can determine is that the pre out voltage of the Nova is much higher than that so it seems that it should work.
ZD, I really don't know enough to make an informed decision about PP vs SE for my purposes. It would make sense, I suppose, to choose the more powerful amp if I were to choose to continue using the Ethos' as long as the current capability was adequate. On the other hand, if my understanding of their personalities is correct, SE would likely better suit my tastes. Also, price has to be a consideration in my consideration.

It looks like I've got some more studying to do.

Atmasphere, much of your advice given to me in the past on this subject was during a time when I was committed to my ML's but now that I have started using these Serie Reference 3A's and I'm pretty sure I'm staying with them. These have an efficiency rating of 92 or 95 depending on which article I've read and the amp in question here has a power rating of 30-40 WPC. Is that something I can live with using a SE amp?

Al, I have a call in to Mr Goka of Divergent Technologies to get what I can from him re this subject of sensitivity as well as his recommendations for upgrades or cap replacement for these 2 decade old speakers. I'm actually afraid to mess with them too much, though, they sound so good the way they are.
BTW, most of what I listen to has a fairly limited dynamic range and I listen to symphonic music only occasionally so, hopefully, that won't be a significant issue.
Thanks for pointing out the model number; I just knew that it was 2 monoblocks sharing the same chassis and thought they were the SE, not the B's. In reading the online 300SSE manual myself the rating published there is, indeed, 20 WPC. Considering the owner's opinion re the power rating, I'm beginning to wonder what the model really is. He did say it was a custom chassis and I haven't yet seen it.

Mechans, the Cary amp that I want to try hasn't yet become available so I haven't had a chance to try it. The request for advice, though, wasn't meant to solicit "what if" hypotheses; I seriously wanted to know if I might expect to hear a tube influenced improvement based on introduction of only this power amp. I've had almost no experience with tube based components except for when, going back to the late 50's, monaural and tube amps were the only choice. Also, over 30 years ago I discovered electrostatic speakers and have stayed with them ever since and, based on their inordinate current demands and advice I was given, I decided it best to stay solid state.

Now that I have these really nice monitors I thought it was time to see what I may have been missing all these years. Also, with age, my hearing is changing to the extent that I'm finding more and more music passages that I used to seriously enjoy have started sounding somewhat harsh to the point of discomfort. Now I don't expect tubes to be the panacea for these listening woes but if some of the edges can be rounded a bit and if tubes can contribute to this, the improvement would be welcomed.