Building the Audio Note Kit 1 SET amp...

60 x 4 =240.00 USD, much less than the top tier 300b tubes. But as with the tubes you don't know which capacitor is better for you until you hear them. Jupiter copper foils are considered to be amongst the very top level capacitors per reviews and owner feedback. I put then in my Frankensteins(1 coupling cap per mono block) and they are a nice upgrade(not night and day however) from what was excellent sound with the stock solens caps.

Charles,
Interesting that you put the Jupiter's in your Frankensteins - I don't know that I'd have the nerve to mess with such a top-tier, commercial product. But interesting to hear that they made a difference.
I think my first upgrade to the Kit 1 will probably be a "real" power cord, as I'm still using this leftover computer power cord. I'm a believer in speaker cables sounding different because I've experienced that myself in my own system. Power cords? I'm a little skeptical but open to convincing. Audio Advisor has these Pangea cords made with Cardas copper and they're under $100, so it seems like a pretty low-risk experiment.
By the way, I was listening to Paul Simon's "Rhythm of the Saints" LP last night with my mouth hanging open. I love this amp! It just makes music! :-)

Hi Reb,
I use the Pangaea AC 9 SE and it is a little more quiet with more prominent bass. Not a night and day difference but really good value for the money, and well made.

Rebbi,
The Frankenstein has very good parts quality, no question. However sometimes strategic use of premium level parts can elevate an already excellent component. I put Duelund CAST caps in my DAC and speakers and they improved a component that had fine sound to begin with. Your amp deserves a high level power cord. If you find a used Coincident or Triode Wire cord I'd take that chance.
Charles,

I've been curious about the Coincident myself, but naturally, it costs more.