Even if your speaker has a high efficiency, I do not recommend small power SET amplifier to drive two 15 inch drivers.
You may try this one as a starting point.
https://www.audiogon.com/listings/lis9b270-line-magnetic-216i-tube
Later if you can afford more, then I recommend Line Magnetic 508.
https://reverb.com/item/17478397-line-magnetic-508ia-single-ended-triode-vacuum-tube-2018-black-clas...
I am happy with Line Magnetic 508 for 6 months.
https://forums.stevehoffman.tv/threads/new-line-magnetic-508ia-integrated-amp.542333/
You may try this one as a starting point.
https://www.audiogon.com/listings/lis9b270-line-magnetic-216i-tube
Later if you can afford more, then I recommend Line Magnetic 508.
https://reverb.com/item/17478397-line-magnetic-508ia-single-ended-triode-vacuum-tube-2018-black-clas...
I am happy with Line Magnetic 508 for 6 months.
https://forums.stevehoffman.tv/threads/new-line-magnetic-508ia-integrated-amp.542333/