Dear Randelldoyle: Your Quad speakers are not very efficient one: 88db, and their nomonal impedance is 6 Ohms ( but they go as down 3 Ohms ).
These speakers characteristics tell to any one that it will best matched with SS electronics.
You can choose a tube amp but you never really could heard the real great Quad 12L sound reproduction performance through tubes .
Every tube amp ( any ) has a high output impedance that preclude a steady ( frecuency response ) performance.
Regards and enjoy the music.
Raul.
These speakers characteristics tell to any one that it will best matched with SS electronics.
You can choose a tube amp but you never really could heard the real great Quad 12L sound reproduction performance through tubes .
Every tube amp ( any ) has a high output impedance that preclude a steady ( frecuency response ) performance.
Regards and enjoy the music.
Raul.