MC33078:what's the meaning about MZ,GZ,EZ markcode on the top of IC?if it means different places of production? We find that the MC33078 with different markcode influences the tone colour we listen.The MC33078 is used in our KTV PROCESSOR

[JYU.11]

MC33078:what's the meaning about MZ,GZ,EZ markcode on the top of IC?if it means different places of production? We find that the MC33078 with different markcode influences the tone colour we listen.The MC33078 is used in our  KTV PROCESSOR