The amount of tubes means very little ,you truly only need2
somecj preampsonly 1 tube they split 1/2 of each side
the transformers ,chokes and powersupplies make they most difference
quality counts ,look atVacuum tube guru Radu Tarta all highendLundahltransformers or chokes ,or Yamamoto, or Monolith
snd he don’t use coupling caps ,he believes in Highend transformer coupled
its much more $$ but excellent signal isolation and purity .
capacitor coupled too cap an be very good but high quality parts count
look atLinear Tube Audio Micro Zoe very nice tube preamp with several tube choices .