Cartridge Loading for a phono pre amp

@imhififan ​@fundsgon  friends: As I said not only the Shure or Telarc test records are really good but other as Ortofon are great as the CBS Laboratories series and the Stereo Review and we have not forget the B/K and Vanguard.

 

I own in mint condition/almost new around 15-20 vintage test record.

 

The Ortofon are special because there is no analog recorder in the recording process due that are D2D and the Telarc neither because is a digital recording test LPs. We can find out almost any test we can make not only tracking or resonance issues.

 

I bougth all through ebay and the overall recording proccess of any of those old test LPs even for today " standards " are second to none.

 

R.

I don’t care of you about, useless and futile. My last posts to imhifi..  makes no reference to you .

 

Bye, bye ! !

 

R.

atmasphere

One of the side issues associated with this topic is that of ticks and pops. If the phono section has good RFI immunity and if it also has good high frequency overload margins, that peak at 1 or 2MHz won't overload the input of the phono and you'll get less ticks and pops.

That is absolutely true. In fact, with a clean LP (the only kind I play), ticks and pops are virtually non-existent. I've played LPs brought by visitors, after cleaning them ultrasonically, and they've been astounded by the silence.

I use an ARC Ref Phono 2SE balanced into a Ref 5SE. With an MC cartridge, the difference between 47K and 100 ohm loading is virtually undetectable and may even be zero. (You can use the Ref Phono remote to change loading from your listening chair.)

For all the ad hominem attacks, handwaving and double-talk that has plagued this thread, I've yet to find any fault with what @atmasphere has explained.

Dear @cleeds :   " I've yet to find any fault..." , good because all statements are only " anecdotes " or imagination that proves nothing.

 

Take a look:

" The industry spec is 47K for all cartridges.  " where is the " official " announcement about, say by the AES that coul confirm it? where?

 

"  less able to trace high frequencies. " again: where are the white papers that can confirm it.

 

 

holmz asked:

" Wouldn’t loading it down to 250 ohms from say 47k make it softer as the back EMF os gone that “would have been” stalling the motor? "

his answer was:  " EMF?. No...." the same answer on other 2 subject treads different forums where was proved that it's EMF:

"Yes, it really is back EMF- it's calculated using Lentz's law and is a consequence of Faraday's Law of Induction and it occurs as a result of the change in current through the coil- that's where the frequency dependent term comes from (the derivative). The term is subtracted from the voltage generated by the cartridge and in that way it acts to reduce the output voltage and hence the current, so there's a degree of negative feedback.  "

and in this thread you can find out the equations used. In this and the other threads your " man " "just " dead silence "  against that EMF analysis the engeenering did it, not a single comment.

This is the 4 time he posted this " tale " or in the best sense a non proved anectdote:

"  He ( J,Carr ) and I met and spoke about this topic at a Munich audio show 6 years ago; "  so WHAT??????

 

"  I have maintained is that the additional stiffness may decrease the ability of the cartridge to trace high frequencies, "" again, where are the white papers that shows and proves that that is happening? where?

Then he posted other tale: " the Grado Gold MI bad tracker anecdote "  that proves nothing.

 

" Empirically speaking its easy to deduce that the load is affecting the ability of the stylus to trace the groove, which is why we see distortion as essentially the stylus is mistracking.  "  again: where are white papers that shows exactly that and not mere " imagination "?

 

" Your target for mechanical resonance is between 7-12Hz. The mechanical resonance is a product of the mass of the cartridge in the arm vs the compliance of the cantilever of the cartridge. Changing the load from 47K to 100 Ohms can easily get you outside of this target window- and that can cause tracking problems.. "

That is ridiculous and with no facts or diagrams/equations that shows exactly that. I That " can easily get you outside of this target window ( ideal resonance frequency range. ) " is not proved here or in any other subject threads. Again: only IMAGINATION.

 

Another " anecdote "/tale that rpoves nothinG:

" won't overload the input of the phono and you'll get less ticks and pops. I had this graphically demonstrated to me when an employee complained of a noisy LP he had bought. His LP played fine on the shop system so he brought in his preamp and there were the ticks and pops, sounding for all the world as if they were on the LP surface. "

 

So, "  I've yet to find any fault.." ? wow ! ! I had the impresion that you was or have higher audio knowledge levels. Well all we learn something every day.

 

At " least " J.Carr shows his white papers diagrams that are self explained. 

R.

 

 

 

I use an ARC Ref Phono 2SE balanced into a Ref 5SE. With an MC cartridge, the difference between 47K and 100 ohm loading is virtually undetectable and may even be zero. (You can use the Ref Phono remote to change loading from your listening chair.)

Why ARC featured such function in their reference phono stage that serve no purpose? So they can charge more?🤔