PREAMPLIFIER UPGRADE QUESTION

I think the Rogue is fully balanced, is it not?

As an interim step, if not already, you could upgrade the tubes in the RP-1. I put a set of Mullards in from Andy’s tube services and have really enjoyed them. Enjoy those while you continue research on high grade pre

Also you might try the PS Audio BHK Pre.  That has 12AU7 valved input stage. And you can possibly trial that unit and they give you a decent amount for the Rogue.  Although you proly do better selling RP-1 on your own as people snap those up pretty quickly. 

I like Bryston.  I only have one of their streamers that has been discontinued but they have still provided support for it and it sounds great as a ROON endpoint and standalone.  That kind of effort is hard to find that in this industry.  You would expect synergy with their pre eh?

Having said that I like Tube pre with SS/AB/Switch amps.  I remember one of the most impressive pieces I heard back years ago at RMAF was an Octave integrated with a set of Dynaudio speakers.   Modest setup relative to others at the show but impressive.   Their HP SE series of Pre might be worth investigating.    I been lusting for one ever since that show :)