How make my Ayre system "warmer"?

To cut long story short, try Kubala-Sosna Emotion powercords, and when your budget allows it add IC's na SC.
You will not lose any resolution and balance will lean more to the bass.

I've got six NOS(pre- 1968) CCa's in my CDP(BAT VK-D5) and enjoy their presentation very much. Like you said, "It's also the gear into which the tubes are placed." My goal has always been to recreate(as much as possible) what I hear and feel in the live venues I visit/work a couple times, every week. It's been my experience that most people blame excellent components for shortcomings elsewhere in their audio chain. Again- Everyone has their own tastes also(I believe I mentioned, "subjective evaluations"). BTW- What was the manufacturing date on those CCa's you had? The ones made after '67 could singe your ear hairs with their stridency.

FWIW, Rodman99999, having owned one of those DK5 since they first came out, I think the Siemans may be particularily synergistic with it, not that they have a universal tone, one size fits all, for all applications. But I could imagine a case could be made for them in the DK5. The bass in the DK5 is a tad less than perfect and can use the tightening up that the Siemans would bring (as did the OEM Sovteks). Put warm tubes in that puppy and the bass gets muddy as all get out. That is my experience anyway. I can as easily accept Tvad's observation that in his applications they sounded clinical.