Cartridge Loading for a phono pre amp

Dear @imhififan  : I followed your advise and my curiosity and made some tests with 4 different cartridges mounted in two identical tonearms in the same whole room/system. Cartridges were: Denon 103, Sumiko Talisman ( B ), vdH Colibri and Ortofon A95 and I used 3 different of my test recording LPs where I runned for resonance and tracking . All cartridge/tonearm alignment set up as accurate as I can and take care of recording/stylus tip clean. I used too the after market AT vacuum hold down item as Discwasher gun demagnetizer. I did it with and with out using the damping silicon tray in the tonearms:

results in all cases were with out differences because thwe load impedance changes.

I used too 5-6  LP demanding tracks of nor mal MUSIC recordings one a Sheffield direct to two track recording where by a fault in my sample ( I think is a fault but not totally sure. ) in one track several of cartridges have a mistraking in that high frequency grooves. Here the mistracking in the 103 was what normally is no matters of load impedance and the others where the mistracking is really near to non-perceptible stays that way.

Other track was the last third part of the Telarc 1812 where not only has a toruose low bass grooves for any cartridge but at the same time tortuose high frequency with the Carrillon/tambourin/triangle. Here the load changes shows no difference on tracking/resonance and in all the LPs " clicks/pops " were non-existents due to load changes.

R.

@holmz  : " I happy you have a wizard,...."

Again, you readed it  in a wrong way because you or me can't find out any " wizard " in my whole system.

What's happening with you and with what you read here and every where?

R.

 

Again, you readed it in a wrong way because you or me can’t find out any " wizard " in my whole system.

 

What’s happening with you and with what you read here and every where?

 

R.

OK @rauliruegas what is this:

 

 

The P1 "Wizard"

 

As with all voltage amplification circuits, proper impedance loading is crucial to the resultant frequency response of the audio signal. The P1 provides a selection of five hundred resistance values from 20Ω all the way to 100kΩ in logarithmic increments; you’ll have steps of 1 ohm in the 20 Ohms range and the gaps between the values are increasing as you go upwards. The steps around 24k Ohms or above, are at 500 ohm increments. While most manufacturers will tell you to "go with your ear" while choosing the right loading, CH has developed an approach based on scientific measurements. The P1 is built in with an ingenious two part "Wizard" which will determine the optimal settings for GAIN and MC loading resistance automatically.

 

The P1 comes with a test LP designed to work with the P1’s internal distortion analyzer.

 

How reliable is the Wizard? I compared the results generated by the P1 versus the results from my own proprietary test LP and analog setup software currently under development. We arrived at the exact loading choice with a difference of only 10-20 ohms. Assuming we are relying on each other as the reliable benchmark, the results are close enough to be called scientifically verifiable! "

 

Swiss made too and expensive Dartzeel 18NS. MC load impedance up to 300ohms:

What's happening with you and with what you read here and every where?

I don’t know, I admit that I am having a hard time following along.

@holmz : That's a highligth of the Swiss CH 95K+ phono stage.

R.

Raul is obfuscating.

His contention is that loading has no effect on the compliance of the cartridge. I showed that it does. 

Since the amount of energy directly affects how much force it takes to move any generator by the direct proportion of energy asked of it (for example if you ask 1 Amp of a generator and it takes X amount of energy to spin it, asking 10 Amps of the generator will make it 10X harder to spin).

I provided a link to this effect earlier.

Since a cartridge is also a generator, asking it to make 400X more energy will affect it in a similar way. The only variable is that the cantilever has a springiness that affects the outcome of the equation. But its a simple fact that the coil itself will be 400X harder to move (this being between 47K load vs 100 Ohm load per Raul's example).

Again, this principle is easy to demonstrate. Loudspeakers are moving coil, as they are mechanical transducers just as is a cartridge. If you try to move the woofer with your hand you'll notice it takes a small amount of effort. Now put a short across the speaker terminals and see how easy it is to move the woofer- you'll see its a lot stiffer. The same thing happens with a cartridge.

Raul is arguing for some sort of 'free energy' as best I can make out, since that has to be how it would work if loading did not affect the cartridge in this manner.

Occam's Razor sorts this out easily enough.