Hello,
I would say stick to chip based DACs with tube gear unless you are going to a Holo May or a Denifrips Plus for DACs $5k or less which have a special over sampling function. Last but not least is the RME Black pro. It has tone controls. It will let you dial in the sound that you want. For $2k that is not bad. One of the best R2R DACs I have demoed was the Electrocompaniet. Very smooth without loss of detail. That’s the biggie. The loss of detail or sparkle when you pair DACs with tube gear. I have tested this. It’s about budget. If you can, please demo stuff on your system. If you cannot then heed my advise. The one I liked for the money was the first gen of the M2Tech young DAC. It had a touch of sibilant. When a friend installed it on his full Rogue tube system he said it was awesome. You can get these pretty cheap. If you want to take this to another level get an SBooster linear power supply for it. This sound will smoke a basic DAC. I hope this helped. This store in the Chicagoland area has this DAC.
https://holmaudio.com/I don’t run tube gear. If I did I would have this DAC for the price. It’s probably $1K with the SBOOSTER. You will have to check.