patrickdowns4 and others of LTA/ Linear Tube Audio praise are absolutely correct. I bought a LTA MicroZotl pre; gave it a shot, played with the tube configuration and decided it beats or as good as my $13,000 Conrad Johnson GAT pre. MicroZotl comes with a built in Headphone amp as well as being an amazing pre with a super volume control; remote is easy to learn in my opinion; its an Apple Remote. Try one out for free for 30 days; call them.
https://www.lineartubeaudio.com/tradein-demo-bstock/microzotl-preamplifier-b-stock-case
https://www.lineartubeaudio.com/
301-448-1534