A friend of me will connect this cartridge (4mV output) to the MM-input of Linn's LK-1.
In genuine condition there is an input load of 68pF and 100K (instead the most usual 100-150pF and 47K).
The recommendation input load resistor under
Grado Labs - Sonata3
is between 10K and 47K (a wide range).
But no value of "pF" is mentioned.
Who know typical values for this cartridge ?
Are there anywhere diagrams of this cartridge with use of different load values ?
Thank you very much for an advice.
In genuine condition there is an input load of 68pF and 100K (instead the most usual 100-150pF and 47K).
The recommendation input load resistor under
Grado Labs - Sonata3
is between 10K and 47K (a wide range).
But no value of "pF" is mentioned.
Who know typical values for this cartridge ?
Are there anywhere diagrams of this cartridge with use of different load values ?
Thank you very much for an advice.
These are low inductance cartridges (55mH) which means they will tolerate a lot more capacitance than found in typical connection setups - basically they don't have to be tuned with an external capacitance. (This is stated on that page BTW as "Non-Sensative to Capacitative Load")
They are low enough in impedance to be able to drive 10k by the same reasoning.
Many MM cartridges are around about 0.5H, ie an order of magnitude more inductance, which puts the LC resonant frequency around 15kHz for the few 100pF seen in most setups - this is why the capacitance and load resistance is important for these as it affects the frequency response in the audio spectrum.
With only 55mH these resonances are up well into the ultrasonic range and the response is basically flat in the audio range for a wide range of loadings.
They are low enough in impedance to be able to drive 10k by the same reasoning.
Many MM cartridges are around about 0.5H, ie an order of magnitude more inductance, which puts the LC resonant frequency around 15kHz for the few 100pF seen in most setups - this is why the capacitance and load resistance is important for these as it affects the frequency response in the audio spectrum.
With only 55mH these resonances are up well into the ultrasonic range and the response is basically flat in the audio range for a wide range of loadings.
good advice - thank you. Please post the URL to the marked term
Check also post #34 under
JFET SRPP RIAA Preamp
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Hi, I use 47K on my Sonata II and it is fine there. As noted above they don't care about the capacitance. So an easy fix for your amp is to make a connector that goes between the cartridge and input to the preamp section that has a 100K resistor between the signal and ground leads. That in parallel with your existing 100K input will give you 50K which is fine for the cartridge. If you could find 82K or 91K resistors they would be just under the 47K recommended load. Now all that said since the cartridge is really non-sensitive to what it is fed into I would certainly consider just connecting it to the amp and see if you like the sound. It will probably be fine.
Your link to Grado site: {attached}
Note twoXXX three spelling errors in this specsheet; Joseph Grado would be displeased.
Attachments
I see. In a German forum under
Schon gehort? - Grado Systeme der neuen Timbre Serie - Tonabnehmer und Tonarme - Analogue Audio Association
(post #2 fourth section) one user disagrees to GRADO's statement "None sensitive to capacitive load".
The English translation:
BUT ... contrary to the information on the Grado site, I don't agree with the Grado statement that the cartridges are "insensitive" to the capacitive load. I perceive small differences when changing capacitance and especially around 200pF the sonic character is less harsh and crispy.
Schon gehort? - Grado Systeme der neuen Timbre Serie - Tonabnehmer und Tonarme - Analogue Audio Association
(post #2 fourth section) one user disagrees to GRADO's statement "None sensitive to capacitive load".
The English translation:
BUT ... contrary to the information on the Grado site, I don't agree with the Grado statement that the cartridges are "insensitive" to the capacitive load. I perceive small differences when changing capacitance and especially around 200pF the sonic character is less harsh and crispy.
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