Well I have to stick my neck out, and put myself in the cross hairs, but I cannot see why people pursue vinyl with such vigour.
I haven't played a record for over 12 years, but have just bought a new belt for my LP12, a new Denon DL304, and made a new 2mm vinyl disc mat, and am about to try it.
I expect, 'well that is OK', but if I'm astounded I will come back and apologise.
I haven't played a record for over 12 years, but have just bought a new belt for my LP12, a new Denon DL304, and made a new 2mm vinyl disc mat, and am about to try it.
I expect, 'well that is OK', but if I'm astounded I will come back and apologise.
Why do you care? It beats looking for the DAC that goes from -129dB to -130dB SINAD. The DAC stuff here has become so horribly boring I don't know how it engages anyone's brain.
Oh I pretty much only care about the analog signal on the other end and whether it brings me joy or not.
Enjoy the music, whatever medium and ritual gets you there!
I don't quite understand you there, I am talking about pickups effectively being air cored transformers, MM having more turns than MC and higher preamp input load resistance so local magnetic fields induce better into MM coil and are also less loaded by preamp input so greater system sensitivity to stray magnetic fields for MM than MC.
Yes, in practice it means the cartridge windings only are connected to the preamp inputs, and the arm and tt chassis earths are connected to preamp chassis.
The cartridge shielding body should be earthed and can be connected to headshell/arm via mounting screws or earthed to one channel signal negative via insertable earth strap but not both.
Max.
Vinyl can sound remarkably good for such an improbable technology. Like you, I did not play an album for over a decade. I had a setup at one stage with an Empire MM a couple of years ago, and because I could not get rid of hum and also because it sounded plain bad, I never used it.
With the Denon and my new preamp, it has become a completely different ballgame. Completely listenable and really very nice. But it requires good components and care setting it all up. Your cartridge should be even better than mine, so I hope you will enjoy.
For good measure, please let me show the schematic of the preamp I put together. The exact value of the feedback resistors might be a bit different, I freestyle my solderings to a large degree.
Since common mode reduction only takes place in the next stage, it is important to match the feedback resistors. For the riaa components selection is only needed for the precision of the correction, which I don't think is all that important btw. Opamps used are LME49990.
As a side note: this whole corona situation is sapping energy, so in spite of the fact that all the time is mine, I get little done. I wanted to have done some noise measurements already, and they will be done, but the flesh is weak.
Since common mode reduction only takes place in the next stage, it is important to match the feedback resistors. For the riaa components selection is only needed for the precision of the correction, which I don't think is all that important btw. Opamps used are LME49990.
As a side note: this whole corona situation is sapping energy, so in spite of the fact that all the time is mine, I get little done. I wanted to have done some noise measurements already, and they will be done, but the flesh is weak.
Except very few MC are air core* and I'm not aware of any MM being air cored.
*Hans and I are both owners of air core MCs, but it is the exception rather than the rule.
Hi Vacu,
Since we are talking about CMRR, a few tips for your circuit-diagram.
1) When connecting R47 and R48 to each other instead of to gnd, (evt in series with a 3900u cap, but is not really necessary), you will get the maximum CMRR from the LME49990 and matching of feedback resistors and caps will no longer be an issue.
2) instead of connecting the junction of R53 and R54 to gnd, you could insert something like 10K in between to gnd.
A mismatch in both resistors will be converted in DM when the interconnects from your Cart pick up some EMR signal.
With the additional 10K this DM conversion will be largely attenuated.
Parallel to this 10K you could add a 100pF cap to suppress HF.
Hans
External magnetic fields coupling to MM signal coils or MC signal coils is what I mean by 'air cored'.
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Clear and helpful as always.
Thanks
I see troubles ahead (entangled)
YouTube
We ‘ve suffered a lot from using poor terminology
George
I said I'd look up those measurements Wayne did. Of course now I can't find them. But I have found this A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851 - Page 46 - Pro Audio Design Forum which shows how much the MC cartridge can pickup in a hostile environment. It also shows how Hans can pick up traffic from a few miles away on his turntable 
Max PlanckExternal magnetic fields coupling to MM signal coils or MC signal coils is what I mean by 'air cored'.
So what else do you call airborne interference coupling from one coil to another coil ???.