Thanks for sharing this. I believe power cords should be shielded. Co. that make (expensive) after-market ones say this.
No power supply is quiet, unless you can prove the rectifier & regulator produce zero noise. Most rectifiers were putting huge amounts of noise on the line.
There’s lots of RF in a component -besides the rectifier, digital clocks, capacitor discharge -all radiate. Then all that metal in the component to conduct it (in phono cartridges, DAC-chips, leads on PCBs). And while we can’t hear RF, it gets ’sucked’ into the signal path and THAT gets amplified.
House wiring is probably the wrong gauge and along with a stock power cord, we were choking the ability of the noise to ’escape’ via ground-loops. Any noise in the component STAYED in the component.
Who knows what else. There’s always been a lack of studies explaining our problems. But in recent years, Shunyata Co. has brought forth some new measurements (for current delivery and noise dissipation).
No power supply is quiet, unless you can prove the rectifier & regulator produce zero noise. Most rectifiers were putting huge amounts of noise on the line.
There’s lots of RF in a component -besides the rectifier, digital clocks, capacitor discharge -all radiate. Then all that metal in the component to conduct it (in phono cartridges, DAC-chips, leads on PCBs). And while we can’t hear RF, it gets ’sucked’ into the signal path and THAT gets amplified.
House wiring is probably the wrong gauge and along with a stock power cord, we were choking the ability of the noise to ’escape’ via ground-loops. Any noise in the component STAYED in the component.
Who knows what else. There’s always been a lack of studies explaining our problems. But in recent years, Shunyata Co. has brought forth some new measurements (for current delivery and noise dissipation).