Cartridge Loading for a phono pre amp

These only 2 of your examples about that 47k input impedance:

SP6

50K ohms, all inputs. (Magnetic phono may have any value from 10 ohms to 100K ohms substituted. Also has provision to add input capacitance for matching certain magnetic cartridges.)

PV12

• Frequency Response: 2Hz to 100kHz
• Distortion: 0.25%
• Gain: 49dB (mm), 16.5dB (line)
• Input Sensitivity:
• Signal to Noise Ratio: 78dB (mm)

" In the PV12 with phono stage, this input provides the amplification and equalization required by moving magnet and high output moving coil cartridges. " This information came by CJ directly, not mine.

One of them not even handled LOMC cartridges that’s the real issue.

Useless that you insist about. No one active high gain phono stage came or comes by default with fixed 47k input impedance, no one. I posted here around 8-9 today phono stages ranging in price from 3K to 95K that’s is not only enough evidence but a true evidence and not as your CJ or SP6 and the like.

In the other side you did not gave us the answer to what you posted before:

" can easily get you outside of this target window ( ideal resonance frequency range. ) "

where are those cartridges that with today decent medium mass tonearms shows what you said coming from 100 ohms to 47k or the other way around. We need to see/read those numbers out of the ideal frequency range due to loading. Where ? and don’t try to distract with other kind of information or other question: JUST SHOWS THOSE NUMBERS AND LOMC CARTRIDGE MODELS WITH TONEARMS.

R.

J.Carr: " Regarding loading of low-impedance MC cartridges, in general I recommend trying to reduce any capacitances present between cartridge and phono stage input to as little as possible. Use the lowest-capacitance phono cable that seems decent, turn off any additional capacitance in the input stage of the phono amplifier etc.

The reduced capacitance should make it possible for you use a wider range of loading impedances without having the sound go bright, peaky or thin-bodied. Conversely, any excess capacitance between cartridge and phono stage input will almost certainly force you into choosing lower loading impedances to save your ears. "

Why JC? because he is a true expert in any cartridge design and a co-designer of one of one of the great ( all time ) active high gain phono stages.

With out diminish here any one he has a way higher whole knowledge levels on the thread issues that any one of us. He is the " SOURCE " of true.

R.

50K ohms, all inputs. (Magnetic phono may have any value from 10 ohms to 100K ohms substituted. Also has provision to add input capacitance for matching certain magnetic cartridges.)

The preamp has a 49.9K resistor to ground, but has other elements in parallel. It measures out at 47K.

You know we can do this all day.

In the other side you did not gave us the answer to what you posted before:

 

" can easily get you outside of this target window ( ideal resonance frequency range. ) "

Sure I did. Whether you are able to understand what I posted is another matter.

Dear @imhififan  : Rigth now you can look the Telarc test LPs ( Omnidisc. ) and the Ortofon in ebay. The one Ortofon to go is that where you read: !" direct cut ".

Other nice  characteristic of both  is that comes with live recorded MUSIC and this sole fact makes both desirable items.

Other LP that we can use not only for tests but to enjoy music are the Opus label series.

R.