The Luxman L-509 series of class AB amps are very capable, as are their class A siblings - the L-590 and L-595SA integrated amps.
The L-595 is apparently the last class A integrated amp that Luxman made, but Accuphase continues to make class A integrated amps such as the E-800 and class A separates such as the A-48, A-80 and the A-300 class A monoblocks.
If you are considering Luxman or Pass offerings you should also look into Accuphase products.