Does an aftermarket power cord matters for Amp?

I am currently using the stock power cord for my VAC Avatar tube integrated amp. I have upgraded my cdp's power cord (given the trigger-down theory with source component) a while ago with a Synergistic Research A/C Master Coupler and had good results. I have been wondering if I should do the same for the Amp and question if it really does make a difference. If so, is it significant and worth the investment?
Absolutely! Now finding the right cord for your system is the fun of the hobby. You'll get enough recommendations to keep you busy for a long while. The homework will be fun. I just replaced my Lat Internationals, serveral weeks ago, with two Sonoran power cords run from 2 dedicated outlets to my Eclipse power conditioner. (am I nuts with my electric, or what?) Today, my Harmonix Studio Masters are arriving. They will go from Eclipse to cdp and amp. You, certainly, don't have to get crazy with pcs to get audible benefits. But be careful, out there. It's a jungle and power cords can become a $$ habit. peace, warren

P.S. I have used Ern's cord. You can always email me for more feedback. It's a nice introduction to power cord possiblilites, BUT fasten you seatbelt....
If you are happy with the Synergistic AC Master Coupler you are using on your front end, you might want to just step up a notch. I use the Active AC Master Coupler (w/mpc) on my B&K receiver with very good results. This last weekend I tried a Dimarzio PC (I use Dimarzio Super M-Path speaker cables) and although the sound was pleasant, the SR provided a much wider bandwidth of info and better bass. Also, many P/C's still exhibit an audible hiss when the sound is muted. The Active SR virtually eliminates the hiss. all of the above suggestions are good, however you could just stay with something you know. My 2 cents.
My first pc upgrade was two relatively inexpensive Sonic Horizon cable into my amp and preamp. The difference from the stock cords was quite noticeable -- more refined sound. I have since "upgraded" tp more expensive Michael Wolff cords. They make subtle improvements, but not as significant as the replacement of stock cords. The replacement of stock cords created a larger difference than when I subsequently added a Richard Gray Power Company 600.
Funny that member Jkphoto pushes Kubala-Sosna. When Jkphoto is the Kubala. Nice try.
After trying many P/C's from the Cable Co. I found the Shunyata Mojave's to be the best sonic match for my B&K mono amps.