Thanks, Bill.
I suppose strain gauge transducer f response might be a different sort of level sensitive, if it is at all?
LD
Is there not a noise advantage using MM carts because you have to equalize above 2120 Hz at c. 20 dB/decade. You then curtail Johnson noise at the same time (talking all active here, or an active passive with the 2120 pole implemented after the gain stage)?
I see the usual suspects return to the murder scene 😀
Electrical Impedance measurement of some cartridges
First set
mechanical resonance in MMs
mechanical resonance in MMs
Second set, more accurate measurements(using buffer)
Cartridge dynamic behaviour
Cartridge dynamic behaviour
Cartridge dynamic behaviour
Cartridge dynamic behaviour
Cartridge dynamic behaviour
Cartridge dynamic behaviour
George
I wouldn't expect SG to be level sensitive within the operating region as the elements themselves are fairly linear. BUT the coupling between cantilever and element is the damper which might explain the rising frequency response. I'm not sure anyone has really looked at it in depth. The work Kevin has done on here had gone as far as anything else I have read.
I spent some late hours digging in the mud of those old threads.
I am not doing any work lately on cartridges.
But inherent stupidity drags me even lower in the depths of audio uselessness (cassette decks 😀)
What’s your opinion Bill on this cartridge for reading 50ies and 60ies vinyl pressings?
George
I am not doing any work lately on cartridges.
But inherent stupidity drags me even lower in the depths of audio uselessness (cassette decks 😀)
I had asked the local importer for it but they didn't have it .
What’s your opinion Bill on this cartridge for reading 50ies and 60ies vinyl pressings?
George
Hi George. The SC35 should be great in a heavy enough arm. There is a higher compliance insert as well. Embarassingly I have not found time to test mine yet. will PM you.
Yes, absolutely no evidence here. Just the mechanical arrangement depends on Hooks law being linear for the materials involved, which aren't necessarily so, and stranger things have been known. The transducers themselves should be linear i'd expect as you say.
LD
That is true with a slight caveat, in most industrial applications DC is all anyone worries about. The mechanical properties of the full system vs frequency are rarely discussed beyond settling time to a transient. There is a term strain rate sensitivity which is material dependent. We are probably breaking new ground here since the makers seem to simply assume they are essentially perfect in this application.
Another small point which is probably not important, IIRC the carts use a 1/2 bridge and most industrial applications use a full bridge. A full 4 element bridge has the opportunity for cancellation of some SG artifacts as well as better linearity.
I'm not sure but I think there are no new SG cart designs, Kevin's opinion was that they are using a stash of NOS Panasonic ones.
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I'm not aware of any new designs. Optical is being investigated again. Pretty sure the only difference beween a panasonic and a soundsmith is the LEDs so you can't interoperate!
A fully differential 4 element bridge transducer would be something to try, but I have no idea how to bring that about without a substantial investment of time and money.
Guys we are off track and I've helped in the derailing.
I have yet to build it in a proper way
mechanical resonance in MMs
See this shunt feedback RIAA pre
Shunt feedback in phono preamplifiers - Page 2 - audio qualia
and a nice recording through it
http://www.onlyliveaudio.com/Audio Files/Bichevskaya - The Carriage Stood At Church.flac
Naturally Sounding Music
George
I have yet to build it in a proper way
mechanical resonance in MMs
See this shunt feedback RIAA pre
Shunt feedback in phono preamplifiers - Page 2 - audio qualia
and a nice recording through it
http://www.onlyliveaudio.com/Audio Files/Bichevskaya - The Carriage Stood At Church.flac
Naturally Sounding Music
George
Advantage over which other technology? TBH with Hans, Scott and LD they have come up with various topologies that are far enough below the best vinyl noise floor that it's just not an issue. Doesn't stop pushing the envelope for Sh*t and giggles of course.
Not sure what you mean all carts need the last RIAA time constant. The boost of program content improves SNR at the stylus tip.
It's important to keep this in mind, the noise with shorted or well behaved input resistance is only part of the issue. I tried to suggest a different metric (distribution of sample to sample difference) in my article which still makes some sense to me because it rejects the low frequency issues of LP reproduction.
Maybe we're just missing the boat here. McIntosh MTI100 Integrated Turntable
All the bases covered, sigh. And I thought Scots were thrifty, I certainly am.
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Damned odd place to put the (green backlit) tubes where you cue from. Me I'm doing really daft things.
One cartridge, 3 cantilever options. Left to right Cactus, Boron and Beryllium. Cartridge is AT22 which from the age of low output low Z*. Hand wound coils. Should provide some interesting diversions and some measured data. Soundsmith want $7k for their cactus cantilevered cartridge!
*Nothing like as low as Grados or the panasonic EP205CIIL but 85mH is still pretty low.
One cartridge, 3 cantilever options. Left to right Cactus, Boron and Beryllium. Cartridge is AT22 which from the age of low output low Z*. Hand wound coils. Should provide some interesting diversions and some measured data. Soundsmith want $7k for their cactus cantilevered cartridge!
*Nothing like as low as Grados or the panasonic EP205CIIL but 85mH is still pretty low.
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