Stylus Evaluation Imaging

the thin end of the wedge
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ray_parkhurst
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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 22 Jan 2019 16:48

You can see what a well-worn Shure spherical looks like in my very first post to this thread. It's not pretty! At some point I plan to image all my cartridges, but haven't found the time. It's going to be easier now since I changed my objective to one with longer working distance.

BMRR
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Re: Stylus Evaluation Imaging

Post by BMRR » 22 Jan 2019 16:51

ray_parkhurst wrote:
22 Jan 2019 16:48
You can see what a well-worn Shure spherical looks like in my very first post to this thread.
Isn't that an N99E stylus, which should be a .2x.7mil elliptical meant to track at 1.25g?

ray_parkhurst
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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 22 Jan 2019 17:03

Hmm, I think you're right. It was so worn I could not tell, but I checked a new stylus and indeed it is elliptical.

This probably means I don't own any conical styli.

fscl
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Re: Stylus Evaluation Imaging

Post by fscl » 22 Jan 2019 17:06

ray_parkhurst wrote:
22 Jan 2019 16:48
You can see what a well-worn Shure spherical looks like in my very first post to this thread. It's not pretty! At some point I plan to image all my cartridges, but haven't found the time. It's going to be easier now since I changed my objective to one with longer working distance.
Have you gotten around to listening to that Shure spherical / elliptical ? and post an audio clip of the worn stylus vs a low hr. conical / elliptical..... :-k

Was wondering if you can easily identify the sound of a horribly worn stylus and what to listen for, ie do the highs and mids just disappear, everything sounds horribly muddy :-k :?:

TIA

Fred

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 22 Jan 2019 17:11

fscl wrote:
22 Jan 2019 17:06
Have you gotten around to listening to that Shure spherical / elliptical ? and post an audio clip of the worn stylus vs a low hr. conical / elliptical..... :-k

Was wondering if you can easily identify the sound of a horribly worn stylus and what to listen for, ie do the highs and mids just disappear, everything sounds horribly muddy :-k :?:
Not yet, but it's in the (long) queue!

ray_parkhurst
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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 24 Jan 2019 04:54

Here's the second stylus imaged by Shure technique. I did a shallower stack ("only" 28 images) so it only shows the stylus itself. Much less rotation on this one.

http://i943.photobucket.com/albums/ad27 ... ing/Q1.jpg

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Re: Stylus Evaluation Imaging

Post by tep392 » 28 Jan 2019 17:39

I was trying to take a few photo's of some new old stock ADC QLM styli I picked up recently. I haven't used a microscope since the 90's, so these aren't very good. I was using an older microscope in our metlab. The first is a QLM36 mkiii 0.3x0.7 elliptical. The second is a QLM33 mkiii which is advertised by most online sellers as elliptical but old ADC literature I've found states 0.7 conical. I'm not sure my photo's shows it well, but it's looked conical to me under the scope. I was really struggling with the lighting and shallow depth of field.

QLM36
qlm36mkiii_2.png
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QLM33
qlm33mkiii.png
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ray_parkhurst
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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 30 Jan 2019 15:38

Those look pretty good. I think the light is not quite at the right angle, since the entire side of the stylus is reflecting. The only part that should show reflections is near the very tip. The upper part is typically 10-deg smaller angle (70-deg included angle vs 90-deg for the actual contacts). I'd recommend moving the lights a bit so they shine just on the contact areas.

That bottom stylus indeed looks like a conical.

tep392
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Re: Stylus Evaluation Imaging

Post by tep392 » 30 Jan 2019 16:04

Here's one more I took of the QLM36 elliptical the other day. I will try some more tomorrow and change the light angles. I have three fiber optic light sources I can position around the stylus.
qlm36mkiii_1.png
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BlazingArrow74
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Re: Stylus Evaluation Imaging

Post by BlazingArrow74 » 03 Feb 2019 20:26

Wow, I wish all diamonds were nude.

sivagriva
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Re: Stylus Evaluation Imaging

Post by sivagriva » 07 Apr 2019 10:58

That's the tip of my Denon DL-103 SL, 30 years old, regularly used but between rotation with others carts...
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sivagriva
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Re: Stylus Evaluation Imaging

Post by sivagriva » 07 Apr 2019 11:16

About a year old, factory NOS replacement JVC 4DT-20X stylus versus heavy worn original from 1972
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New one
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Old one
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scho2684
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Re: Stylus Evaluation Imaging

Post by scho2684 » 07 Apr 2019 11:54

That leaves no imagination, heavy worn is a very nuanced expression here...

fscl
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Re: Stylus Evaluation Imaging

Post by fscl » 08 Apr 2019 15:22

sivagriva wrote:
07 Apr 2019 11:16
About a year old, factory NOS replacement JVC 4DT-20X stylus versus heavy worn original from 1972
What was the major / most striking difference in the sound between the New OS and and heavy wear original..... :-k :-k :-k

Wondering what to listen for / how sound is effected, TIA

Fred

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Re: Stylus Evaluation Imaging

Post by BlazingArrow74 » 09 Apr 2019 02:52

Those look great, Sivagriva, but the one with heavy wear scares me: almost a different shape entirely, not to mention the split near the tip. How does it sound ?

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