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.
I bought the cord.