Ive run my Salons with 35 watt Triode tubes recently. The Salons are a bit more difficult to drive than the Studio's but in my room(24'x14'x8')35 watts is more than enough power to push the speakers in the the mid to high 90 db range.
50-100 watts of power is PLENTY to push those Studios properly(which I used to own) in all but the largest cathedral ceiling rooms.
