Cartridge Impedance

Dear @lewm  @terry9   :   """  Impedance (which depends on frequency), capacitance (from the phono cable to the preamp), and inductance from the MC coils.  The combination effectively forms a broad band-pass filter. """

that's was posted anthonymaw and this is what I posted on the regards:

"""  What normally happens is that in some phono stages when load impedance is changed exist/developed an electrical circuit between the phono stage: inductance, impedance and cartridge inductance and even capacitance and whom react to load impedance in reality is not the LOMC but the phono stage performance. ""

that's " a broad band-pass filter ".


R.




   

Dear friends. If what atmasphere posted: """  the cantilever to do more work and makes it stiffer, less able to track higher frequencies.  """

if that theory is a proved reality then it's welcomed because what a cartridge designer is looking ( between other characteristics. ) is that for cantilevers build materials on choice  its Young Modulus value be the higher  one and that's why the first/main choices are diamond and Boron over any other cantilever build materials that have the higher YM values.


""" Young's Modulus alt. Modulus of Elasticity - is a measure of stiffness of an elastic material. It is used to describe the elastic properties of objects like wires, rods or ...... """

So it's not wrong as he always says but at the end I never seen a white paper that proved that theory and again if already proved then welcomed !.

R. 

Dear @terry9 : "" and whom react to load impedance in reality is not the LOMC but the phono stage performance. """

That’s what I posted.


""" and makes it stiffer, less able to track higher frequencies. """

that’s not proved, it’s theory. In a normal designed phono stage you can test the MC 2000 LOMC cartridge by Ortofon that has really good tracking abilities and changing load impedances you just can’t detect " less able to track higher frequencies ". For this could happens you need that a cartridge with over 30cu goes down to 6cu ( stiffer. ) and that just can´t be happened because a normal load impedance changes. Just common sense.

Btw, the OP says: """ I just bought a phono pre-amp that allows me to adjust the impedance of a MC cartridge. I was using 100ohms. Now I want to experiment. """

what he need is to experiment with because you or me or any one else here know exactly that phono stage circuit design.

Against that reality, all our posts are irrelevant because all of us own different phono stages and room/systems. Useless, he needs to has first hand experiences and that’s all:  he has in the OP the response. My bad explanation and other only can makes that this Agon new comer can have a mix up: maybe not, who knows?.

Testing is the name of the OP game.

R.

@lewm  : ""  The inductance combined with capacitance introduced by the IC and by the input gain stage can cause a high frequency resonance. With LOMCs, this occurs at very high frequencies, well beyond audibility or the capacity of any speaker to reproduce, because of the low inductance and given any reasonable amount of capacitance.   ""

yes, that's what I mean with a very bad explanation and is something that's not totally proved: it's what in theory could happens. Now, we can hear nothing at the frequency that was affected or its frequency range.

As I said, LOMC are sensitive ( very ) to inductance and very tolerant to load capacitance changes.

R.

Dear @terry9  : First than all I said that LOMC cartridges are not sensitive to load impedance changes in the phono stage and that's the phono stage whom is sensitive to those load impedance changes thatform a circuit internally and that " there " even capacitance has something to say.

I never told capacitance affects the LOMC items, it's obvious it did not. You, me and every one else knew about.

R.

Dear @jmh128 :  LOMC cartridges are not sensitive to load inpedance, are sensitive to inductance changes.

What normally happens is that in some phono stages when load impedance is changed exist/developed an electrical circuit between the phono stage: inductance, impedance and cartridge inductance and even capacitance and whom react to load impedance in reality is not the LOMC but the phono stage performance.

If the phono stage has a good circuits design then 100 ohms normally is the " rigth " value to go and forget to make changes.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.