Jaybo, the A318B will have no problem with the Zu Tones. The Tones are rated at 96dB/12ohms, an easy load for for tube amps.
I owned the A31A & A318B for several months and drove a range of speakers with them including 90dB/4ohm Jean Marie Reynaud Twins mkII's. The A318B was fantastic with the Twins within reasonable limitations.
I owned the A31A & A318B for several months and drove a range of speakers with them including 90dB/4ohm Jean Marie Reynaud Twins mkII's. The A318B was fantastic with the Twins within reasonable limitations.