Power cord for MHDT Havana

There should be a significant difference between the Technics and the Havana. It's possible your system isn't resolving enough or your ears aren't trained to hear the difference. I really doubt a power cord will change much.

I was in a similar situation years ago when I compared a $50 Sony CD player with a Rega Planet 2000. I couldn't detect a difference after weeks of comparison. It wasn't until I upgraded the rest of my system that I eventually heard an improvement.

You might want to consider some other gear changes. I don't know anything about B&K equipment, but your Paradigm should be fairly revealing speakers.

Mingles,
Can you give more details about your upgrades. Also let me know the configuration of your system.

At the time, I had a Yamaha receiver and Dahlquist speakers. Switching to separate amp and preamp improved resolution, but the most significant change came when I had the right amp driving my speakers. If you don't get that synergy right, you'll waste a lot of time and money upgrading source components. In my system, resolution really came into focus with: Promitheus TVC preamp, Quicksilver Mid Monos, Alon Model I speakers, Rega Planet 2000. It wasn't an expensive system, but it was extremely satisfying.

You might want to take the advice of Notec and Ejlif to use a different transport to see if things improve. If you have a computer, try connecting it to the Havana and see how it sounds. When you import into your computer, use the highest resolution possible. If using iTunes, import as AIFF or Apple Lossless. Using your computer will be the cheapest way to test things. If you have questions on how to set that up, this is a good place to ask for help.