How much do you have to spend ? Radu Tarta one of the best vacuum tube designers in North America , he going to build me a 2nd preamp
single ended or true balanced which adds a bit of extra cost his preamps either Lundahl or Monolith transformers , not cheap but his $6k -$7k preamp
will be at minimum as good as anything at $20 k rule of thumb for Anything commercial brand 4-1 only 25% of the cost goes into the product including packaging ,the rest R&D overhead and markup.and Radu’s parts quality far superior myself into modding over 20 years Quality counts !!