5 Watt SET amp and Spendor 2/3 Speakers

I heard a 15 watt set amp driving spendor sp100's and it was more than enough power and sounded glorous to boot.

15 watts is minimum, really for the 2/3; I used an Audio NOte P2SE (single ended pentode, 17 watts) with good results but it was a little lacking during the louder passages of works such as the Ninth Symphony. I would want a solid 20 watts; a nice 845 or 300b push/pull class A amp would work very well.