Product Placement Blog ➞ Audio Equipment & ElectronicsMarshall Amps in Cobra Kai S03E05 “Miyagi-Do” (2021)January 3, 2021 Sergey TV Show Hi! On Sunday, January 3, I watched a TV Show and product placement was spotted: Marshall Amps in Cobra Kai S03E05 “Miyagi-Do” (2021).