Input. I’ve owned an "original" Freya for a while and can absolutely say that different tubes present a markedly different sound, with the input tubes (on the right) having the main impact on tone. After rolling between the original Russian 68HCs and various 6SN7GTBs I’ve settled on NOS GE 6SN7GTBs to satisfy my tonal requirements...that and pot smoking.
Which Preamp Tube is most consequential: Input or Gain
I've just gotten a pair of 1950s Tung-Sols for my Schiit Freya to replace two of the stock Russian NOS 6SN7. I will try them in both positions, but is there a typical position of more impact in terms of rolling preamp tubes in the input vs. gain positions? Thanks for any experience you'd like to share.