Playing with Cartirdge loading on my phono stage

There are only two settings available that fall within the specified 100-200 Ohm range…100 and 170.  Try both and decide if you prefer one or the other…leave the capacitance at 470pF.  

Would it not depend on the frequency response of your speakers in your listening room with your tastes for sound in mind?

Would it not depend on the frequency response of your speakers in your listening room with your tastes for sound in mind?

No. The reason the sound changes is due to distortion- LOMC cartridges and the tonearm cable together form an electrical resonance that generates Radio Frequency Interference which is injected directly into the phono section and can cause distortion. The loading resistor detunes the electrical resonance, thus eliminating the RFI.

However if your preamp was designed by someone that knows about this phenomena, you'll find that the highest load impedance (47,000 Ohms) is the right one, with little or no effect at lower resistances other than the tracking ability is reduced.

No. The reason the sound changes is due to distortion- LOMC cartridges and the tonearm cable together form an electrical resonance that generates Radio Frequency Interference which is injected directly into the phono section and can cause distortion. The loading resistor detunes the electrical resonance, thus eliminating the RFI.

However if your preamp was designed by someone that knows about this phenomena, you'll find that the highest load impedance (47,000 Ohms) is the right one, with little or no effect at lower resistances other than the tracking ability is reduced.

@atmasphere does that mean we can just select the load with an o-scope?
and select the highest resistant value possible?

does that mean we can just select the load with an o-scope?
and select the highest resistant value possible?

It would be better to use a distortion analyzer, but this would only be of benefit if the phono section can't deal with the RFI on its own. If the phono section does deal with the RFI properly, you'll see no benefit from the loading in terms of distortion.