The RM10 gets rave reviews, but it is a power amp so you will need a preamp. A passive may work, but if not you’ll need to add an active preamp. In both scenarios you’ll also need to audition and purchase interconnects.
For your first foray into tubes, I suggest you go for an integrated. As far as unrefined sound goes, that can usually be treated by rolling in different tubes.
Have you looked at a used PrimaLuna? They present the warmth that you liked from the Dynaco.