Klipsch

It should do just fine...as tubes and Klipsch are a good match.

What tube amp are you looking at ?

2a3 set dht made by a friend about 8-10wpc

might want to look at the prices of the 2a3 tubes....not cheap.

For what it's worth 45 SET mono amps seem to drive Klipsch Cornwall IIs very well.

"How would the Klipsch KLF-10 speakers do with low powered set tube amp?"
The KFF-10 speakers would work very well and sound good. There's always a better sounding speaker to purchase but if you like horns, Klipsch is a good way to go. I've owned many. As far as pricing of 2A3 tubes...there are many to choose from at different prices...no problem. I used a 5 watt 2A3 monoblocks with Klipsch speakers.

I used the Klipsch KLF-30 speakers.

I have Klipsch KLF-20 in HT setup with Yamaha RXV-3000.
My Yaqin MC10L (50W tube amp) sounds much much more musical than Yamaha on KLF.
Yamaha does OK for movies, though.

I have a pair of klf-10s and I use bryston gear. Even though they will work with lower powered amps power is always a plus! More dynamic sounding with power behind them. Bryston B135 sings on those speakers and much more balanced sound then a SET.