if I buy a used piece of gear, it’s mine. Especially if I got to hear and see it before I bought it. I would not even consider returning it. If I sold a item to a fellow audiogoner, I would expect that they would feel the same way.
But I would also let the buyer know all I had done to the unit. But this is used equipment, who knows what the previous owners had done to it.
But I would also let the buyer know all I had done to the unit. But this is used equipment, who knows what the previous owners had done to it.