As a practice, at the point when the vintage unit requires some servicing ... and most receivers and amps will have to be professionally serviced ... I have the technician upgrade the power cord. I have done this with both my Marantz units ... a 2216B and a 2240. I am not sure if I necessarily have heard audible differences ... but the old power cords do dry out . As for interconnects ... I always have used decent mid level cables and with my vintage equipment it is no different.
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