I agree with amplifier upgrade and like Jrinkerptdnet's mention of a Vintage solution. Sam Kim of Sam's Audio Labs is a master circuit designer and vintage equipment restorer/upgrader. Sam upgraded my McIntosh MR-71 to Triode and it's amazing. Check out this link to get an idea:
http://www.samsaudiolabs.com/about.html
I also like the dedicated circuit upgrade because I did that and it does make a difference but that can wait. Replace your HK and then do the AC. You will then be able to easily identify the weakest links after that.
http://www.samsaudiolabs.com/about.html
I also like the dedicated circuit upgrade because I did that and it does make a difference but that can wait. Replace your HK and then do the AC. You will then be able to easily identify the weakest links after that.