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Cartridge dynamic behaviour
Cartridge dynamic behaviour
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Old 15th April 2019, 10:51 AM   #1201
billshurv is offline billshurv  United Kingdom
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Cartridge dynamic behaviour
I'm being dim again (it is monday). The superOM, which on paper has a 'better' inductor in its generator has a far higher resonant peak. I'm not convinced this is a good thing?
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Old 15th April 2019, 11:01 AM   #1202
Hans Polak is offline Hans Polak  Netherlands
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Quote:
Originally Posted by gpapag View Post
For those that are interested, a more detailed view of the same data.
Corrected Z Modulus in linear scale and tabulated data.

George
George

I projected my initial wild guess for the resonance peak frequency and magnitude for the Ortofon OM10 in green on your measured result in red.
That's important information, which as it seems corresponds quite well to your measurement.
That's good to know, will save me quite some time.

In the same image you can see in blue the corresponding Reactance, here multiplied by a factor 1e5 for the purpose of bringing it on the same scale.
But to dissect the Cart into its individual parts, going from green to blue, it's obvious that I need more information.
Sorry if I expressed myself a bit rude when saying that I couldn't use your measurements for this purpose, it was not meant to be so and after all your resonance peak turns out unexpectedly to be vey helpful.


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Old 15th April 2019, 11:11 AM   #1203
Hans Polak is offline Hans Polak  Netherlands
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Quote:
Originally Posted by billshurv View Post
I'm being dim again (it is monday). The superOM, which on paper has a 'better' inductor in its generator has a far higher resonant peak. I'm not convinced this is a good thing?
I honestly don't think this has anything to do with good or bad, it's simply the combination of resonance between the inductor and the parallel 9pF cap, limited in magnitude by the 1Meg resistance.


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Last edited by Hans Polak; 15th April 2019 at 11:21 AM.
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Old 15th April 2019, 12:11 PM   #1204
gpapag is offline gpapag  Greece
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Cartridge dynamic behaviour
Hi Hans
No worries. There was nothing in your post that should make you worry.
As I wrote, I understand that the lack of phase data hinders the modeling.
At least, it's good that Z modulus data fits the model you have built.
By the end of the week I may be able to show freq sweep impedance data up to 96kHz (Mogens's soundcard arrives tomorrow)

George
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Old 15th April 2019, 12:41 PM   #1205
mkc is offline mkc  Denmark
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Cartridge dynamic behaviour
Hi George,

Given your last comment I assume you have heard from the postal service? I checked track and trace today and there do not seem to have been any movement since Wednesday last week.

Mogens
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Old 15th April 2019, 01:37 PM   #1206
billshurv is offline billshurv  United Kingdom
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Cartridge dynamic behaviour
Quote:
Originally Posted by Hans Polak View Post
I honestly don't think this has anything to do with good or bad, it's simply the combination of resonance between the inductor and the parallel 9pF cap, limited in magnitude by the 1Meg resistance.


Hans

I meant from the point of view of having an optimised phono stage is a lower Q resonance better? I not that the super OM and SC35 track despite very different generator designs but the the solid pin OM (dual) could be considered to have preferable high frequency behaviour.



It's interesting stuff even if it makes little difference to the end output
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Old 15th April 2019, 03:32 PM   #1207
gpapag is offline gpapag  Greece
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Cartridge dynamic behaviour
Quote:
Originally Posted by mkc View Post
and there do not seem to have been any movement since Wednesday last week
On the surface
Beneath it, things are moving sloowwllyy

George
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Old 16th April 2019, 03:58 PM   #1208
luckythedog is offline luckythedog  United Kingdom
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I've been working on recreating Scott's SW method, and playing about to see what's possible. Here's the first attempt at using it to look at 2nd and 3rd harmonic distortion versus f using JP's 1 - 50kHz sweep file.

Rough at the moment and will improve, but bodes well.

LD
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Old 16th April 2019, 04:02 PM   #1209
scott wurcer is offline scott wurcer  United States
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Originally Posted by luckythedog View Post

Rough at the moment and will improve, but bodes well.

LD
I might give it a shot later, looks very much like some kind of intercept behavior below 20k, interesting.
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Old 16th April 2019, 04:10 PM   #1210
billshurv is offline billshurv  United Kingdom
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Cartridge dynamic behaviour
Where's my 'here be dragons' avatar!
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