Other than the tubes and one of the power cord plugs, these pristine amps appear to be all original. All of the tubes recently tested strong and they are a combination of vintage RCA and vintage Sylvania brand tubes. All of the 5881 output tubes are vintage RCA matched tubes. As the photos show, these amps are extremely clean for their age, including all of the original potted transformers. You would have a hard time finding another pair of these late 1950′s tube amps in such clean and great sounding condition. These amps comes exactly as shown in the photos with all of the tubes shown. Own this pair of vintage Heathkit W4AM tube amps for a great price.