«  A very good series. »

I bought this amp on ebay four years ago, I bought a second system for another YAMAHA (AX 550) quickly sold because of a sound rendering metal, matte, without personality.
The A 520 is more effective to show him my ears with a sound closer to best vintage electronics that is accurate, lively, full of health.!
This amp is one of the best value for money from Yamaha because later with the AX series, the manufacturer has taken a turn toward more "commercial" with any more devices.
In short, the A 520 is a rugged amp AND music that I recommend to all those like me who listen to stuff like pêchus rock, jazz rock, fusion, associate him as Cabasse speakers vintage, BW, 3A where other Siare and (re) find music you love ....!!!!!