My amp was Prima Luna Prologue Two, which is KT88, but can use EL34, 6550 and I believe some more of KT series, but I havent tried any than above. Dont get me wrong, I liked EL34 and if you deside to switch, try NOS Tesla.
Also, I tried Unison Research S2 ones and it was clear not my thing, however, they guy who sold me Tannoys advised to check S8 model, but I havent try it yet.
I drive my Tannoy’s D700 by Cary 300B ( classic chrome body with 11 w p.ch. or something ) and the match is very good, they are 93dB, think that mono’s will be better, but it is good for now. I also tried Zanden 7000 300B ones, which is 8 w p.ch. only, and the sound was superb, as it is all about transformers.
I wish I had the money to get Tom Evans pre and power amps, maybe one day.