Be careful about what noise harvesting means. The current ”art” is to show pre power supply data that isn’t the “final answer” at the Vcc DC supply rails where modulation will alter the AC signal as it changes the transistors gain linearity.
Noise prior to a P10 or any good power supply is not meaningful unless it effects the DC supply voltage stability somehow. Curiously, no one shows that. Current delivery is ONLY effected by the measured inductance, which IGNORES the dielectrics and even the frequency. To properly compare cords the AWG and the inductance have to be specified or you really know nothing at all. Curiously, no L and C data is supplied with those $$$ power cords.
What you need to be concerned with, is the Vcc ripple specification in your power supply. An amplifier at WAY full tilt may benefit from a 12 AWG cord (what is in your wall for a 20A circuit) if your wall voltage sags. Most sources outside of HUGE power amps won’t come even remotely close to sagging your wall voltage.
If there is a difference in cords, it is the INDUCTANCE value that determines how quickly the max current can be drawn. Capacitance isn’t as critical as we are at full wall voltage all the time. This max value aspect of current delivery MAY be true for amplifiers that MIGHT sag the internal power supply. No one bothers to determine if that’s the case, and it most likely isn’t. Better is better but if the power supply is made right, it won’t sag with the PVC cord in the box. A PVC cord can have low inductance!
I can spray my yard for ants to keep the little barbarians away from the gates. But if the little barbarians were kept out prior to the “improvements” what really changed? We need to test farther down stream and decide if the technology, even if it kills all the ants, was appropriate in the first place.
I see scant little data on power cords downstream effects on the Vcc, and this is it’s job…to get steady and noise free Vcc at any current level. Seldom is this going to be changed with power cord RF noise. My P10 shows the exact same ingress “noise” difference with an 18 AWG cord and a over one-thousand dollar 10 AWG power cord. The outgoing trace is clean as can be. The biggest thing a P10 or like device does, is hold the wall voltage steady through the day where it sags. If significant, this can indeed alter amplifier characteristics, especially tube bias.
Low inductance cords are nice to make sure the current delivery is always as good as your ROMEX will allow, it has inductance, too, but at what cost? Are the barbarians at the gate or past it?
As a customer, you can “feel” any way you want to. I do all the time! But as a manufacturer, I have to go with the data. Good data on the power cord itself still leaves the question of what gets past the gates.
Galen Gareis