You might want to have a listen to TRON, a bespoke UK valve amplifier company. Graham Tricker, the designer, distributes AG in the UK and has designed his amplifiers specifically to run with AG and other high efficiency horns. He has a distributor in Heggedal, Norway
http://www.x3mhc.no/
I use a TRON Voyager to drive my AG Duos and am extremely happy. The TRON sounds great and it has zero circuit noise - so itÂ’s silent unlike some valve amps with AGs. If his current amps are too expensive, he is planning to launch a new lower cost 300B SET called the Atlantic at Munich in May.
http://www.x3mhc.no/
I use a TRON Voyager to drive my AG Duos and am extremely happy. The TRON sounds great and it has zero circuit noise - so itÂ’s silent unlike some valve amps with AGs. If his current amps are too expensive, he is planning to launch a new lower cost 300B SET called the Atlantic at Munich in May.