MARKIII Preamp 12AX7 Tubes: CHINA or Tung Sol???

[path09en]

I currently have CHINA 12AX7's in V2 to V5 and a Groove Tube (ECC83?) in my preamp section. Does anyone know how my tone will be influenced or changed if I replace all the preamp tubes with Tung Sol 12AX7's?

Thanks!

 

[dennq45]

Chinese tubes make your amp very bright sounding. The Tung-Sol will darken it. I mix em up.