Additional LCR Network for existing MM Cartridge Load (for flat Frequency Response and the highest possible upper Frequency Limit)
The typical but actually undesirable situation you will find in the diagrams here:
Moving magnet phase shift
Either you have too much attenuation between approximately 4KHz and 8KHz or you have an extended narrow-band peak before the low-pass filter effect comes into play. In the best case, the frequency response is as flat as possible by only the usual use of two correct load parts (R and C), but then the upper frequency limit (F3) is too low.
An approach for getting better results is describe here:
Linear Audio | your tech audio resource
go for reader comments also to
https://linearaudio.net/sites/linearaudio.net/files/lte_vol3_1.pdf (from page 2)
Very good for new design's in phono pre-amplifier both for diy projects and new commercial RIAA pre-amp devices.
Unfortunately far too laborious to introduce in already existing RIAA preamp devices afterwards because Steven van Raalte's topology (Sallen-Key) works is mostly used in active crossover networks for loudspeakers.
I. e. additional op-amps are not dispensable.
Therefore I have only an additional passive LCR network in mind - implemented as a serial LCR-network - for the parallel connection to the 33-100K (mostly 47K) MM input load. This is much easier to add to already existing phono RIAA pre-amps than additional operational amplifier stages (which would replace the additional coil resp. inductor from a passive LCR network). I am almost sure that this has also already been realized anywhere - unfortunately my English vocabulary is not sufficient enough to find the right keywords for Google.
Thank you very much for some advices and various URL's.
P.S.: this URL's so as the attached files don't provide the wanted information
Discussion on MC Cartridge Loading
Alles nur Physik: Volpe Audio
https://www.mysonic.space/phono-cartridge-impedance-loading
http://www.hagtech.com/loading.html
https://forums.stevehoffman.tv/threads/the-mystery-of-mc-cartridge-load.689607/
https://sound-au.com/articles/cartridge-loading.html
https://www.tnt-audio.com/sorgenti/load_the_magnets_e.html
https://www.audioasylum.com/cgi/t.mpl?f=vinyl&m=418566 (AT-OC9 MLII: 100R/155pF)
mechanical resonance in MMs
Phono cartridge self resonance
Time to reappraise MM cartridges?
Cartridge dynamic behaviour
MM Input Stage working in inverted mode - not to find; why ??
Simple simulation of a MM cartridge
MM transimpedance loading
Synthetic Cartridge Loading
Stylus wear measurement
more URLs:
https://web.archive.org/web/2018011...hsites.net/articles/cartridge-loading.html#s1
https://web.archive.org/web/20170412151803/http://sound.whsites.net/articles/cartridge-loading.html
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1="Negative+impedance"&s2=Meitner&OS=
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2%20FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1="Negative%20+impedance"&s2=Meitner&OS=
https://www.hifisystemcomponents.com/downloads/us-patent.pdf
https://patents.google.com/patent/US4547819A/en
post #78 under
Phono cartridge self resonance
NEW FACTORS IN PHONOGRAPH PREAMPLIFIER DESIGN*
http://www.kallhovde.com/advent/phono-pre-research.pdf
http://www.cordellaudio.com/preamplifiers/vinyltrak.shtml
The typical but actually undesirable situation you will find in the diagrams here:
Moving magnet phase shift
Either you have too much attenuation between approximately 4KHz and 8KHz or you have an extended narrow-band peak before the low-pass filter effect comes into play. In the best case, the frequency response is as flat as possible by only the usual use of two correct load parts (R and C), but then the upper frequency limit (F3) is too low.
An approach for getting better results is describe here:
Linear Audio | your tech audio resource
go for reader comments also to
https://linearaudio.net/sites/linearaudio.net/files/lte_vol3_1.pdf (from page 2)
Very good for new design's in phono pre-amplifier both for diy projects and new commercial RIAA pre-amp devices.
Unfortunately far too laborious to introduce in already existing RIAA preamp devices afterwards because Steven van Raalte's topology (Sallen-Key) works is mostly used in active crossover networks for loudspeakers.
I. e. additional op-amps are not dispensable.
Therefore I have only an additional passive LCR network in mind - implemented as a serial LCR-network - for the parallel connection to the 33-100K (mostly 47K) MM input load. This is much easier to add to already existing phono RIAA pre-amps than additional operational amplifier stages (which would replace the additional coil resp. inductor from a passive LCR network). I am almost sure that this has also already been realized anywhere - unfortunately my English vocabulary is not sufficient enough to find the right keywords for Google.
Thank you very much for some advices and various URL's.
P.S.: this URL's so as the attached files don't provide the wanted information
Discussion on MC Cartridge Loading
Alles nur Physik: Volpe Audio
https://www.mysonic.space/phono-cartridge-impedance-loading
http://www.hagtech.com/loading.html
https://forums.stevehoffman.tv/threads/the-mystery-of-mc-cartridge-load.689607/
https://sound-au.com/articles/cartridge-loading.html
https://www.tnt-audio.com/sorgenti/load_the_magnets_e.html
https://www.audioasylum.com/cgi/t.mpl?f=vinyl&m=418566 (AT-OC9 MLII: 100R/155pF)
mechanical resonance in MMs
Phono cartridge self resonance
Time to reappraise MM cartridges?
Cartridge dynamic behaviour
MM Input Stage working in inverted mode - not to find; why ??
Simple simulation of a MM cartridge
MM transimpedance loading
Synthetic Cartridge Loading
Stylus wear measurement
more URLs:
https://web.archive.org/web/2018011...hsites.net/articles/cartridge-loading.html#s1
https://web.archive.org/web/20170412151803/http://sound.whsites.net/articles/cartridge-loading.html
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1="Negative+impedance"&s2=Meitner&OS=
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2%20FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1="Negative%20+impedance"&s2=Meitner&OS=
https://www.hifisystemcomponents.com/downloads/us-patent.pdf
https://patents.google.com/patent/US4547819A/en
post #78 under
Phono cartridge self resonance
NEW FACTORS IN PHONOGRAPH PREAMPLIFIER DESIGN*
http://www.kallhovde.com/advent/phono-pre-research.pdf
http://www.cordellaudio.com/preamplifiers/vinyltrak.shtml
Last edited:
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