Power cord for low-watt tube amp?

I had a eight watt tube amp once, which came with stock power cord. One night, while at the dealer's house auditioning some speakers to go with it, his opinion was that it sounded a little laid back or not to crisp, and suggested trying a Harmonic Technology PC. So, we did, and no other changes, the difference was very noticable, the sound now was much more alive, and just better to listen to.
I bought the cord.

All - thanks for the very helpful comments - I decided to order a Shunyata Venom 3 today and will let you know how it compares with the cord from the back of my printer. ; )

I don't care if anyone is laughing, but I am not ashamed to say that I spent more on my power cord than I did on my power amp.

But the last laugh is on me,because without the Python CX, my Decware Zen's two watts of EL84 SET power just sounds more powerful than it does with cheap power cords.

I should add that my speaker wires, Nordost Heimdall and Norse jumpers also cost more than my DecWare power amp.
So do my Ref 3A Grand Veenas, my Audio Aero Capitole cd player, my Hydra 8 and my Rega P9.
And my 3 other Shunyata power Annaconda Helix power cords each cost more than my DecWare, and so does my Manley Steelhead that drives my DecWare.

But the DecWare is the wildcard.

To give it anything less than what the other gear has would be to downgrade it's performance.
It is not the poor cousin at all in my system.
As such it is more than deserving of a quality power cord.

I've impressed a few friends and had them fooled into believing the amp was an expensive custom made unit from an old Japanese artisan with a small cult following and only a handfull are known to be in existance.

And then I tell them the truth.

It's inexpensive, and made by an American artisan with a small cult following.

If the OP has one of Steve's units, believe me, it is deserving of the best you can partner with it.

I am sure power cords make a real and immediately audible difference. I would think though, that a good cord is a good cord, which may or may not match well with a component. I am not so convinced a cord is good for CD players power amps etc.
2 cords I use at the moment are Lessloss DPFC and the new Sablon Audio Robusto. Both are excellent, but quite different in their effect on reproduction.
In general, if you can borrow dem cords from your retailer or the cable company, or buy 2nd hand, you reduce any risk of expensive mistakes