All posts related to cartridge internal C and cartridge self resonance have been moved to Phono cartridge self resonance
For further posting related to self resonance, please visit that new dedicated thread
George
I am coming very late to this party, but only just noticed the thread. I can't reconcile the above statement with my data. The last figure in each line is the L/R ratio, and it's all over the place. From Electronics For Vinyl. Electronics for Vinyl
Table 9.1 Some MM cartridge impedances, both current and historical.
Type Resistance Ω Inductance mH L/R ratio
Audio-Technica AT440 Not stated 490 -
Audio-Technica AT15SS 500 720 1.44
CS1 “Carl Cox” 430 400 0.93
Glanz MFG-31E 900 110 0.122
Goldring 1006 660 570 0.863
Goldring 1012GX 660 570 0.863
Goldring 1042 660 570 0.863
Goldring 2044 Not stated 720 -
Goldring 2100 550 550 1.00
Goldring 2200, 2300 550 680 1.24
Goldring 2400, 2500 550 720 1.31
Goldring Elan 700 560 0.80
Goldring Elektra 700 560 0.80
Grado Prestige Green 1, Black 1 475 45 0.095
Grado Prestige Red 1, Blue 1 475 45 0.095
Grado Reference Sonata 1, Platinum 1 475 45 0.095
Ortofon 2M Red, Blue Not stated 700 -
Ortofon 2M Bronze, Black Not stated 630 -
Ortofon OM Super 20 1000 580 0.58
Shure ME75-ED Type 2 610 470 0.77
Shure ME95-ED 1500 650 0.433
Shure M97 1550 700 0.452
Shure V15V MR 815 330 0.405
Shure V15V V 815 330 0.405
Shure V15V IV 1380 500 0.362
Shure V15V III 1350 500 0.370
Shure M44G 650 650 1.00
Stanton 5000 AL-II 535 400 0.747
Hi Douglas,
It's actually much worse as cartridges rarely if ever match the spec in the manual and most of the models of the generator are too simplistic. These discussions have lead to a couple of members actually doing some detailed impedance vs frequency measurements on a few popular cartridges. The results are fascinating and open doors to new experiments.
It's actually much worse as cartridges rarely if ever match the spec in the manual and most of the models of the generator are too simplistic. These discussions have lead to a couple of members actually doing some detailed impedance vs frequency measurements on a few popular cartridges. The results are fascinating and open doors to new experiments.
it's always struck me that manufacturers supply this data in suspiciously round numbers. I do not recall ever seeing any information on inductance tolerance or interchannel inductance balance. Likewise for resistance.
Seems to me that the balance of inductance between channels ought to be very good as it is defined by the number of turns and the magnetic material, which would presumably be the same in each channel.
The tolerance on the value of the inductance may not be so good as there might be batch variations in the magnetic material.
Likewise the resistance should be well controlled as it only depends on number of turns and the wire properties.
Seems to me that the balance of inductance between channels ought to be very good as it is defined by the number of turns and the magnetic material, which would presumably be the same in each channel.
The tolerance on the value of the inductance may not be so good as there might be batch variations in the magnetic material.
Likewise the resistance should be well controlled as it only depends on number of turns and the wire properties.
The conversation has meandered around for the last year or so, but the detailed measurements start here Cartridge dynamic behaviour . So far only half the puzzle as just looking at the MM coil behaviour not the whole electromechanical system but hopefully over the summer I can try and take some measurements to try and tally things up.
This all started from a hunt for the HF mechanical resonance that MM cartridges are supposed to have. This has been repeated so much that it is accepted as truth but no one seems to have measured it, or if they have the knowledge died with them!
I agree the published numbers are suspiciously round and at least Audio Technica are known for not proof reading their data sheets in some cases.
Any news ?
Are there measurements concerning S/N ratio of RIAA phono preamps and record surface noise at the same time ?
The information like
Pass Aleph Ono phono preamplifier:
Unweighted S/N ratio: 90dB ref. 10mV input (MM), 81dB ref. 1mV input (MC)
Linn Linto:
A-weighted S/N ratio (ref. 500uV input at 1kHz) 85.3dB
Graham Audio Era Gold Mk.V phono stage:
Output noise (A wtd): –75dB
usually found are completely useless in real life because a RIAA phono pre-amp isn't a microphone preamp and is never operated without a record on a running turntable and the cartridge-needle lowered.
the URL has changed:
https://www.tapatalk.com/groups/audioqualia/shunt-feedback-in-phono-preamplifiers-t60-s10.html
The marked observation is now to find in post #10