New Power Cable on a 1990 Hafler DH120?

BTW, one of my band mates brought his ancient Hafler amp to see how it sounded in my system.  I was shocked that it more than held its own against my McCormack DNA 0.5 Rev. A.  Not sure which model his Hafler was though, but I was really impressed and could’ve easily lived with that amp, so rehabbing it might not be a bad idea and a good investment.  FWIW. 

Not sure I’d spend too much a 25 year old amp, but a better PC can definitely make a difference.  I’d recommend trying Cullen Cable as they’re a solid upgrade over stock cables but don’t break the bank, and they offer a good trial period so if it doesn’t make a significant difference you can just send it back.  They just got bought by Wyred4Sound so I’d think you’d need to go to their site to order but not sure.  Definitely worth a try though.  Best of luck.