I spoke with someone yesterday who has considerable experience with Luxman Class A, and their counterpart Class A/B Integrateds. His advice was not surprising. In short...with a warmer balanced speaker like Harbeth, he prefers the AB amps. However, with a more revealing, neutral (if you will) speaker like a Kharma, the Lux Class A will give them much needed warmth. I use Kharma and Harbeth because I have owned both and consider them sonic polar opposites.
Luxman L-509X
Any A'Gon readers from Japan listened to this new integrated? The specs and description seems like it could be an incredible piece. Though likely dependent on how good the pre-amp stage sounds. The amp section is supposed to be similar to the great sounding m700u stereo amp.
http://www.audiovenue.uk/newly-launched/luxman-l-509x/
http://www.audiovenue.uk/newly-launched/luxman-l-509x/