Awesome! That might just be the sweet spot on Tannoys for many people. I haven’t tried SET but I KNOW I need at least 20 Watts. I’ve hit the limits on 25 Watts, 35 Watts, and even 75 Watts (that one only by accident) on 93dB Kensingtons (which I owned 10 years back). 25 Watts was more than ample for > 99% of listening, though - and way more than enough for most rock & pop without large dynamic swings. High dynamic range classical (which is not something I listen to often) at high volumes is where it ran out.
The EL34, 5881, 6L6, KT66 - these are gorgeous sounding tubes; it’s really hard to make an amp that doesn’t sound great with these. And they will sound amazing from first watt to the very LAST watt. I had tried all of these types with the Kenstingons on a few restored vintage amps (Heathkits, Eicos), and you’re gonna love the beautiful lush sound they render on Tannoys.