I use my Duos with Quad IIs (rebuilt by Graham Tricker at GT Audio in the UK) driven by a TRON Meteor preamp (now replaced by the Syren). I heard a massive change when I upgraded my pre from a Verdier Control B with valve regulated PSU to the TRON.
The power amps need to be quiet with AG horns; surprisingly the Quads are pretty good. You won't need more than 10W with any AG horn. Either a good PX25 or a 300B would be great. I'm saving up for a TRON SET, which are made specifically to use with AG horns (see www.tron-electric.co.uk). Art Audio, Border Patrol or the TEAD Linear A would be fine otherwise.
Charlie
The power amps need to be quiet with AG horns; surprisingly the Quads are pretty good. You won't need more than 10W with any AG horn. Either a good PX25 or a 300B would be great. I'm saving up for a TRON SET, which are made specifically to use with AG horns (see www.tron-electric.co.uk). Art Audio, Border Patrol or the TEAD Linear A would be fine otherwise.
Charlie