I'd look for a used Almarro A318B integrated (~$1,900 new, ~$1,100 used) which is an 18 wpc amp using Single-Ended 6C33C-B tubes for output.
I have owned both the "A" & "B" versions of this amp("B" is far, far, better, especially for rock), it is simply fantastic and performs far beyond it's price range. In it;s own unique way, it's musical presentation was just as satisfying as my Welborne DRD 300B & Art Audio PX-25 SET($9k) amps. (Not saying it was just as good, but just as musically satisfying in many ways)
6-Moons review
Positive Feedback review
I have owned both the "A" & "B" versions of this amp("B" is far, far, better, especially for rock), it is simply fantastic and performs far beyond it's price range. In it;s own unique way, it's musical presentation was just as satisfying as my Welborne DRD 300B & Art Audio PX-25 SET($9k) amps. (Not saying it was just as good, but just as musically satisfying in many ways)
6-Moons review
Positive Feedback review