Something with 6922 tubes would be good, then get a set of NOS Mullards from a reliable source like Andy @ Vintage Tube Services. Herron 2, older BAT, or CJ. IMHO, AR preamps are more neutral and like your description of the Rogue.
Please don't take offense, but FWIW, sounds like a short term approach and you might be better off figuring out what other component isn't natural enough sounding and making you feel like extra warmth is needed. As you add more neutral (not dry, analytical) components you will get closer to more musical realistic sound. As you get closer to SOTA, the best gear converges at natural. Just an opinion, but one a number of top manufacturers have shared with me. Cheers,
Spencer
Cheers,
Spencer
Please don't take offense, but FWIW, sounds like a short term approach and you might be better off figuring out what other component isn't natural enough sounding and making you feel like extra warmth is needed. As you add more neutral (not dry, analytical) components you will get closer to more musical realistic sound. As you get closer to SOTA, the best gear converges at natural. Just an opinion, but one a number of top manufacturers have shared with me. Cheers,
Spencer
Cheers,
Spencer