New Power Cable on a 1990 Hafler DH120?

Replace the power supply caps and any electrolytic bypass caps on the individual amp channels.  You'll get much better return on investment.

@wlp3 

Sorry you were surprised with some of the responses. I think most of it is due to extra tight underwear. Or, possibly a lack of naps. 

Thanks for all of your input.  Much appreciated!

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. 

I have changed out hundreds of captive ac cords since before the net, and obtained my parts from either HD or Lowes. Now I order everything from the web. As far as a difference ? Absolutely ! Every possible " sound quality " description we all use in this hobby, based on our ears, is enhanced / enlarged. This, just by a heavier gauge wire and superior connector / plug. Your Hafler is a nice amplifier, and would easily exhibit improvements from the design, benefiting your ears. Enjoy ! MrD.