I ran a pair of L1290s with a Primaluna amplifier for a while. It was a KT88 PP amp. I think it was about 35 WPC and in a medium size room it worked great.
I use a/d/s 1290-2s usually with a Dyna ST-70, 35 w/ch. But I found that an amp. as low as 15w/ch. gives high volume (101db SPL) as well as good dynamic peaks. For this case, I use a Scott LK-48. look at Dynakitparts.com.