I've heard the Zu pair nicely w/Yamamoto amp. You need little power, maybe a SET amp would be the way to go. Most seek KT88s when driving tougher speakers. They aren't as refined as 845s, 211s, EL84s, let alone the tiny <10w Fi type amps.
No reason to drop the motor from a school bus into a Prius. Cheers,
Spencer
No reason to drop the motor from a school bus into a Prius. Cheers,
Spencer