atmasphere,
The article I referenced was only to address the affect of inductors. When you say, RFI, are you talking radio frequency interference, or in general, electro-magnetic interference (EMI)? EMI encompasses conducted emissions (CE) , conducted susceptibility (CS), radiative emissions (RE), and radiative susceptibility (RS). My background includes testing equipment to EMI requirements, so I am just trying make sure we are on the same page when communicating. However, Peter at Soundsmith addresses the concept of stylus jitter https://www.sound-smith.com/articles/fixed-coil-vs-moving-coil-why-make-jump-different-technology.
I also have experience with vibration testing. So when I read all this, my analogy is that stylus is tracking the record such that you want the transmissibility (essentially the ratio of the record grove to the stylus-cantilever movement) to be unity, that way the stylus-cantilever reads exactly the groove. If the transmissibility drops below unity, then the stylus-cantilever-suspension is absorbing energy and there will be loss of data. It may read the frequency correctly, but the signal output will be lower than normal, and this could be frequency dependent, so an oscilliscope trace may show some 'suck-out' at the affected frequencies. The list of items that can cause transmissibility less than unity can be of mechanical origin (such as too much VTF) or electrical (such as circuit speed).
If the stylus-cantilever-suspension transmissibility is greater than unity, but not resonating then it will output more data than what is on the record, i.e. it may read the frequency, but the signal output may be high than normal, but again this may be frequency dependent. So, an oscilliscope trace may show some peaking at the affected frequencies. The list of items that can cause transmissibility greater than unity can be of mechanical origin (such as VTA) or electrical (such as cartridge loading and maybe an electrical circuit causing a weird impedance).
However, if the stylus-cantilever-suspension resonates, the transmissibility increases many times causing the stylus-cantilever assembly to move far greater than what is in the groove, thee output signal to increase proportionally, and depending on whether the stylus maintains groove contact, and depending on the pre-amp overload margin can lead to massive harmonic distortion (smearing of the output signal, i.e. conducted emissions) with distorted sound, and/or pops.
Ergo, anything that effects the stylus-cantilever-suspension stiffness, be it of mechanical or electrical origins can affect its ability to properly read the groove. And, since low, mid and high frequency information can simultaneously exist, there can be shall we say over 20,000 opportunities for this unravel. Yes, its a mircale that this works, but as Corey Greenberg said many years ago, a 1000 years from now, good luck trying to find a CD player, but you could play a vinyl record with a pine needle.
The article I referenced was only to address the affect of inductors. When you say, RFI, are you talking radio frequency interference, or in general, electro-magnetic interference (EMI)? EMI encompasses conducted emissions (CE) , conducted susceptibility (CS), radiative emissions (RE), and radiative susceptibility (RS). My background includes testing equipment to EMI requirements, so I am just trying make sure we are on the same page when communicating. However, Peter at Soundsmith addresses the concept of stylus jitter https://www.sound-smith.com/articles/fixed-coil-vs-moving-coil-why-make-jump-different-technology.
I also have experience with vibration testing. So when I read all this, my analogy is that stylus is tracking the record such that you want the transmissibility (essentially the ratio of the record grove to the stylus-cantilever movement) to be unity, that way the stylus-cantilever reads exactly the groove. If the transmissibility drops below unity, then the stylus-cantilever-suspension is absorbing energy and there will be loss of data. It may read the frequency correctly, but the signal output will be lower than normal, and this could be frequency dependent, so an oscilliscope trace may show some 'suck-out' at the affected frequencies. The list of items that can cause transmissibility less than unity can be of mechanical origin (such as too much VTF) or electrical (such as circuit speed).
If the stylus-cantilever-suspension transmissibility is greater than unity, but not resonating then it will output more data than what is on the record, i.e. it may read the frequency, but the signal output may be high than normal, but again this may be frequency dependent. So, an oscilliscope trace may show some peaking at the affected frequencies. The list of items that can cause transmissibility greater than unity can be of mechanical origin (such as VTA) or electrical (such as cartridge loading and maybe an electrical circuit causing a weird impedance).
However, if the stylus-cantilever-suspension resonates, the transmissibility increases many times causing the stylus-cantilever assembly to move far greater than what is in the groove, thee output signal to increase proportionally, and depending on whether the stylus maintains groove contact, and depending on the pre-amp overload margin can lead to massive harmonic distortion (smearing of the output signal, i.e. conducted emissions) with distorted sound, and/or pops.
Ergo, anything that effects the stylus-cantilever-suspension stiffness, be it of mechanical or electrical origins can affect its ability to properly read the groove. And, since low, mid and high frequency information can simultaneously exist, there can be shall we say over 20,000 opportunities for this unravel. Yes, its a mircale that this works, but as Corey Greenberg said many years ago, a 1000 years from now, good luck trying to find a CD player, but you could play a vinyl record with a pine needle.