Onkyo a-8190

I Bought a Onkyo a 8190 3 months ago. It had a lot of static in it when I turned the knobs and the left channel would go on and off so I opened it up and it was the dirtiest amp I ever seen so I cleaned it with a spray cleaner and took off the front cover and spray the controls with a contact cleaner I did all the 3 times put it back together hooked it to my infinity RS 4bs and it didn't sound that good. So I put my Yamaha a 500u back anyway about 2 months later I hooked back the Onkyo and it sounded pretty good so I cleaned it again and it even sounded better now I don't which one to keep which one is the better amp

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