The Jolida 301 is definetly NOT an op chimp based amplifier, unless are read the technicals wrong. BTW, I despise Jolida, for long time ago, back in 1996, I was able to buy one of their earlier tube based produces, really affordable, but the tubes were dead, the craftsmanship was abysmal. Obviously and plainly made in China is the worst sense of the way. Since then, I have turned away from any Chinese made electronics unless I have no recourse. From $350 to $1000, as the TNT review said, well, a grand is a large sum of money for a integrated from Jolida, mods or what not. There are too many choices for that sum. Stay away from Jolida.