Analog Magik

[Balle Clorin]

ANALOG MAGIK v1 with my own Python script to test the method posted here

Electrical Zenith Setup - Intact Audio

 

[tony22]

@Balle Clorin, and where might we be able to get this script? I like the way the results are displayed.

 

[Balle Clorin]

@Balle Clorin, and where might we be able to get this script? I like the way the results are displayed.

Here are my scripts, you need to have Python and put the script and file in the same folder. Rename .txt file .py

I hope the names and scripts are self explanatory, I made then by using AI, so I cannot answer technical stuff about them or how to configure Python on a computer. I use Anaconda, Spyder based on the guideline here.. https://www.audiosciencereview.com/...-cartridge-response-measurement-script.41148/




The script used above is called "IMD vs TIME", I also add some other fun scripts

 

[tony22]

Thanks. I’m quite familiar with Python and Anaconda.

 

[Balle Clorin]

It will be interesting to see your plots on IMD. I wonder what makes my F2-F1 so different in one channel Looking at the sum F1+F1 close to 1 % in both channels seem good to me I guess. I will probably not change this set up but experiment with the method on a second turntable.

 

[Balle Clorin]

her is my IMD% script using the V1 record and the V2 record SET 1 AND 2. Close to opposite results BETWEEN v1 AND v2. How can we trust records?
IMD 60hz:7000Hz pllotted F2-F1 and F1+F2. Notice how the R channel has a spread on V1 while on V2 the spread is on Left channel


edit

 

[squasher]

I am greatly interested in your analysis and understanding how you extracted the data from AnalogMagik.

How did you extract the data from AnalogMagik? Does it have an API for providing this?

p.s. Like your observations regarding the measured differences between V1 and V2, I have similar worries about the AM software in general. It's a good starting point but needs further refinement to provide consistent / meaningful results (and a much better UI)..

 

[Balle Clorin]

Se post 703,
API??

 

[Balle Clorin]

Maybe interesting to see the VTA track for another setup. Shure V15 type IV with Jico SAS-B. the VTA of this stylus is 28-30degrees





Using AM V1 45 rpm record VTA track we get a different result,,,, the null point with IMD is obvious. But how can we trust any result when every record gives a different result on the same system.. BUT wait this track is further out in Radius then the one above. The VTA track is the first in the 45rpm record and second track on the 33 rpm.. maybe we see the true null after all...

EDIT:

What s needed now is a IMD track, preferably mono, that covers the whole record side, then we could see the tracking error/zenith effect over the full radius

 

[Balle Clorin]

@tony22 , if your IMD values are off this DIN test record could maybe help you?

 

[tony22]

@tony22 , if your IMD values are off this DIN test record could maybe help you?

@Balle Clorin , which record is this?

 

[Balle Clorin]

As stated DIN 45 542 Mess Schallplatte. See Discogs for more info

 

[squasher]

As stated DIN 45 542 Mess Schallplatte. See Discogs for more info

Can you be more specific on the record?

Searching for “DIN 45 542 Mess Schallplatte” on discogs comes up with nothing.

 

[Balle Clorin]

Well I get this when searching,

No Artist - DIN 45 542 Verzerrungs-Mess-Schallplatte

View credits, reviews, tracks and shop for the 1966 Vinyl release of "DIN 45 542 Verzerrungs-Mess-Schallplatte" on Discogs.

www.discogs.com

Very rare, but 2 are for sale now. The 370+630Hz track is what I use. TACET test record has a single stereo track , but it dot not work well. VTA tracks must be vertical modulated ( out of phase)

 

[Balle Clorin]

But a microscope can tell you things to . This Jico have VTA of 29 and SRA consequently becomes 99 degrees..this adds about 3% IMD distortion..

 

[Balle Clorin]

I shimmed the VTA of the cartridge above with 6 degrees less VTA, from about 28-29 to about 22 degree.
This had an significant effect- improvement- on IMD distortion..
And important confirmation that change in VTA can be detected even by a stereo track( AMV2 IMDs are stereo tracks) . But a significant change is required.

 

[tony22]

I shimmed the VTA of the cartridge above with 6 degrees less VTA, from about 28-29 to about 22 degree.
This had an significant effect- improvement- on IMD distortion..
And important confirmation that change in VTA can be detected even by a stereo track( AMV2 IMDs are stereo tracks) . But a significant change is required.
View attachment 162666

Balle, as a related question, what were the SRA values before and after this VTA change? Just curious about that. On another note, I thought I read somewhere that VTA around 22 degrees was supposed to be more “nominal” than the 29 degrees you had at the start.

 

[Balle Clorin]

The Jico SAS stylus is an Obray boron = a 20 degree cantilever cut, so I have gone from optically 29 VTA to about 23= 89 to 93.SRA. Based on DIN 452 record I am now at 21-22 VTA or 91-92 SRA. You can see that the AM values are quite similar to the OC9 which I measure to 22 degree VTA on the DIN 45 452 record.
The Jico is maybe one degree less when looking at the IMD% distribution on DIN 452
SRA=VTA+70 on this Obray