Thanks, Fau, Very kind of you to clear my doubts. Now to take the plunge pdnj77

I am 99 percent sure that the SA31 is the amp for me and my HE500's. It obviously has more than enough power,and you have have found it to sound good Does it have any background noise? How hot does it run. How is the service now? Some time ago,one member complained about delays in shipping...

Looks like good news for me. If the SA31 works on both 50 and 60 cycles AC current, I can use it with a step up/step down transformer, whether I am in India or the US. plus of course a big saving if it is at least equal to the Yulong a18

I am a newbie, so you will have to forgive me if my questions seem foolish. The HE500 is rated at 1 watt , so will that mean that the volume control can be turned to only 10percent of the total travel to achieve full volume? Beyond that , is there not a risk of blowing up the drivers? pdnj77