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Phono Cartridge Response Measurement Script

Thomas_A

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Sorry to hear that. I was shocked by the azimuth 1kHz results difference for your Super OM40 as my CAs can all go to at least -30dB. Have you tried side B of the CA?
Yes tried. While I can go to about -30 dB with the CA-TRS1007 it will be only one channel. Equalizing them it will be around - 25 dB for both channels. The Ortofon goes to -35 or lower. 10 dB is a large diff.
 

Thomas_A

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Look at all that “detail” ;)
Yes. :) Not sure why JICO started with these ”esoteric” stylii, now also in wood. Hollow boron… that would be something.
 

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Yes tried. While I can go to about -30 dB with the CA-TRS1007 it will be only one channel. Equalizing them it will be around - 25 dB for both channels. The Ortofon goes to -35 or lower. 10 dB is a large diff.
That's fair. But again, the CA can still be very useful to you if you are mindful of the FR curve. It is not simply about the 1kHz measurement for real world use.

To me this result shows optimal set-up (for outer groove at least) much better

Shure V15Vx JICO SAS B newest _ 1.5 g _ 47 kΩ _ 140 pF _ CA-TRS1007.png


Than this. Because of the consistent and parallel L & R FR above.
shure test azimuth ortofon 3.png
 

Thomas_A

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That's fair. But again, the CA can still be very useful to you if you are mindful of the FR curve. It is not simply about the 1kHz measurement for real world use.

To me this result shows optimal set-up (for outer groove at least) much better

View attachment 311097

Than this. Because of the consistent and parallel L & R FR above.
View attachment 311098
One strange thing with my CA copy is the low crosstalk 5-10 kHz. This tells me that the record pressing has flaws. It should not be lower at these fr.

@JP what is the crosstalk figures of the original JVC TRS-1007?
 

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One strange thing with my CA copy is the low crosstalk 5-10 kHz. This tells me that the record pressing has flaws. It should not be lower at these fr.

@JP what is the crosstalk figures of the original JVC TRS-1007?
The Ortofon results seem to consistently pull apart starting at about 10kHz. I would not trust those results. Maybe CA is more honest around there.
 

Thomas_A

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The Ortofon results seem to consistently pull apart starting at about 10kHz. I would not trust those results. Maybe CA is more honest around there.
Crosstalk increase from1 to 20 kHz which is logical. After 20 kHz I don’t see a purpose to analyse. The same pattern with my Denon XG7001 (mint condition, as new).
 
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JP

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@JP what is the crosstalk figures of the original JVC TRS-1007?

DL-1000A plot on the second page post seems representative. I’ve not done any “limits” exploration.
 
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morillon

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just that the crosstalk.. is observed at 1khz on suitable signals.. and basta... many of your sweeps seem really not up to the task for this observation ;-)
 

Thomas_A

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just that the crosstalk.. is observed at 1khz on suitable signals.. and basta... many of your sweeps seem really not up to the task for this observation ;-)
Correct - I just checked and optimised again against my Ortofon 1 kHz test signals (4 tracks). I can see that I have a channel imbalance of 0.65 dB and average crosstalk of -37 dB. Enough.

RMS power 1: -15 and -53.5 = -38.5 dB
RMS power 2: -52 and -14.2 = -37.8 dB
RMS power 3: -14.8 and -48 = -33.2 dB
RMS power 4: -53.1 and 14.3 = -38.3 dB
 

morillon

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Correct - I just checked and optimised again against my Ortofon 1 kHz test signals (4 tracks). I can see that I have a channel imbalance of 0.65 dB and average crosstalk of -37 dB. Enough.

RMS power 1: -15 and -53.5 = -38.5 dB
RMS power 2: -52 and -14.2 = -37.8 dB
RMS power 3: -14.8 and -48 = -33.2 dB
RMS power 4: -53.1 and 14.3 = -38.3 dB
what cartdrige is this?
it seems to me that you just have to use the range offering the best value for your different cartdrige. the question for progress is:
this 38 5 due to the cartdrige or the ceiling value of this test range?
 
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Thomas_A

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what cartdige is this?
it seems to me that you just have to use the range offering the best value for your different cartdrige. the question for progress is:
this 38 5 due to the cartdrige or the ceiling value of this test range?
Still Shure V15Vx JICO SAS B. I can get lower, below -40 dB , but then it will apply only one channel.
 

Thomas_A

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I don't understand your channel story:oops:...

(-41db old at-155lc)
If I change azimuth I will pass the line where the "crosstalk channel" goes from in-phase to out-of-phase (or vice versa) with the signal channel. In the perfect setup, I would set the crosstalk as low as possible, which is in the transition point from in-phase to out-of-phase. To do that for both channels require perfect motor geometry +45/-45 degrees. A compromise is to set channels as equal as possible (and in the same phase).
See

 
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Balle Clorin

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Can someone post the last version of the 3150HZ W&F Polar plot, please.?
I did something stupid and cannot get it to work Anymore, It just happens nothing when I run it. Not even an error message.
 
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JP

JP

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Thanks, I will wait. On my record, side 1 is better than side 2. On side 1, tracks 3 and 4 are better.

A few years ago I also watched tennis from morning to evening :)

Haven't forgotten about you - got home last Monday and got sick that night. Covid. Just starting to move around again now.
 
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JP

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Oops. Ok, will do it again.
 
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