Reporting question for Transformer - One Electron, Output, 1600 Ω to 16/8/4 Ω

Product:
Transformer - One Electron, Output, 1600 Ω to 16/8/4 Ω

Question:
I d like to make an SET running one Type 45 tube in eachthe channel. Which of your OPTs will make the best in FR?