Power cords for Coincident Frankenstein and AMR DP-777 <100$

Hello Essrand,
The Black Treasure 300b is a very worthy tube (I used them happily for two and a half years ). To better them you'll have to spend more money. For what you'd pay for better 300b tubes that money would get you two good used power cords and a good AC wall outlet  (they make a difference ). Definitely various reasonable routes to consider. In my opinion addressing the AC power (power cable, outlet and upgraded fuses ) is fundamental and money well allocated towards towards improving an audio system.  Choices 😊
Charles, 

Hey Essrand, what I like about these forums is that you can learn from those who have gone before you. I wish I would have listened to such advice years ago. Considering the similar paths you and  charles1dad have and what he had to go through to get where he is, I"d bet dollars to donuts that with his advice, you'd benefit.

All the best,
Nonoise

Nonoise,
Thanks for your kind comments.  You're right I'm advising based strictly on personal experiences. Without question 300b tube choice influences sound quality  (I've heard 11 different 300bs in my amplifier ,numerous generous loans). I just believe that people often underappreciate the value of good quality AC  power. 
Charles, 

Charles1dad and Essrand;
Although I do not own the Coincident Frankenstein, at this point in my auditioning of the Graphene Extreme High Current power cord I can highly recommend it to you. 

Essrand,

I bought my Frankensteins a little over a year ago and used Pangea AC-9 power cords for awhile. They work well. I have not compared them to other cables costing under $100. However, they are comparable to my more expensive JPS AC+ power cables. The difference is subtle, with the Pangea perhaps being just slightly darker and less transparent sounding, and the JPS cables perhaps offering a little more clarity in the bass notes and more high end sparkle. It is hard to tell. There is a 1.5 meter pair of the AC-9's on eBay right now for $79.99 each. The Signal cables seem like a very good deal, and they would have been something I would have tried if I knew about them.

I have had a Synergistic Research graphene power cable for 6 weeks now, and just ordered a pair for the Franks. The improvement when I put the graphene cord in my dac, and later my preamp, is noticeable in a good way, and worth the relatively modest investment (compared to the price of other high end cords). I will post my impressions of how they work with the Franks in the SR power cord thread. The graphene cables from Cerious are reasonably priced, IMO, and worth consideration. The ones from SR are not that much more in price, plus with SR you get a free premium fuse with the purchase.

Tom