Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
Those will be excellent, and no trouble for any tube amp to drive.
It's not uncommon for woofers to have Zmax in excess of 100Ω. I consider most drivers with Zmax < 50Ω to be "tube-friendly," provided they are reasonably sensitive and don't have other issues.