Where to insert tubes while running a Luxman SS integrated

Thanks all for the insight.  Given that I’d like to run with the Luxman, get a somewhat warmer sound through new speakers (the Tannoy Legacy from what I can tell should be a bit warmer than the R3s while maintaining a lot of the imaging/soundstaging of the R3s), and that changing the pre might not be such a great idea, I think moving to tube dacs and phono preamps is my next step here.  The Lab12 Dac 1 Reference recommended by @auroravengeance seems compelling on the digital side.  Does anyone have thoughts on how such tube dacs compare to the popular R2R dacs from Denafrips and Gustard for instance? 

@yogiboy thanks. Any tube phono suggestions you have in mind?

Thanks for your input. I’m currently running KEF R3s with a Pro-Ject X2 (Sumiko Moonstone cart) and a Bluesound Node 2i. However, I’d like to keep the Luxman and upgrade the speakers and sources. I’m thinking of moving over to the Tannoy legacy series, so any input based on that system would be appreciated. 

My journey only started a few years ago and have been gradually upgrading. The KEFs are nice compared to what I had before. Their imaging is probably my favorite aspect of them, but they can be harsh with poor recordings, which has become an annoyance. 

Thanks for your dac suggestions @jjss49. Yes, the Luxman R3 combo is very revealing, including of recordings with harsh treble. I was surprised that the highs are a bit smoother than with the previous amp (the CXA81), though. 

@jjss49 I would probably prioritize digital at this stage as I think my vinyl rig sounds way better and less harsh in the treble than the node’s internal dac. @yogiboy budget for a tube phono would probably be around 2.5k new or used. Same budget for the dac. 

@lalitk sounds like words of wisdom.  Do you have any speaker recommendations in the 4-6k range to run with the Luxman?

@mapman perhaps not, but I’m very satisfied with the combo when I play my good vinyl pressings and even some well-recorded digital.  It’s really bad pressings and some digital that become too harsh (which the R3s do not mask at all—I had the same issue, perhaps slightly worse, when I was running them with the Cambridge). The dilemma is if those particular recordings/pressings can be masked/improved by adding something else to chain.  Or maybe I just need to move to warmer speakers. 

Thanks @mapman and @yogiboy . I’ll try to audition some Tannoys and Spendors (maybe somewhat of a challenge as I'm based in the US). I guess the question of whether to add tubes somewhere in the chain will follow after I acquire new speakers.

Thanks @richdirector ; very helpful.  I presume you find your Ardens warmer than any of the KEFs you’ve heard?