Klipsch

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.