Ask Rogue what they recommend for your friend's particular equipment and tastes. Why doesn't he order a set of BOTH tubes, see which set "voices" better in his system, and sell the set he least prefers?
And remember, it will take time for the amp and tubes to "burn in" before the amp/tubes sound right. Usually, tubes take 75-100 hours to burn in...I don't know how long the amp will take to burn in...again, ask Rogue.
Before burning in, components and tubes will usually sound bright, harsh, edgy, or brittle...it's amazing the sonic change that can take place with 24 hours of play...even though you're not fully burned in yet!
And remember, it will take time for the amp and tubes to "burn in" before the amp/tubes sound right. Usually, tubes take 75-100 hours to burn in...I don't know how long the amp will take to burn in...again, ask Rogue.
Before burning in, components and tubes will usually sound bright, harsh, edgy, or brittle...it's amazing the sonic change that can take place with 24 hours of play...even though you're not fully burned in yet!