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.
peterf6
It all depends on the circuit they are in. Try rolling tubes in each and let your ears decide.
Thank you @ghasley . It's been hard to A/B test when I have to let the tubes cool, switch and try to remember what I heard! And @bigshutterbug per Schiit, L vs. R pairs of tubes on Freya are Input vs. Cathode follower.