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Introducing the Phono Cartridge Measurement Library

Bob from Florida

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Most test records sweeps are recorded without RIAA, or the with RIAA only below 1000hz. So recording flat gives the actual cartridge response ,- and not the cartridge + RIAA amp combined.
So, the CA TRS1007 is not recorded with RIAA?
 

JP

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They have turnover.
 

mackat

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Technics EPC-205C-IIL

Original stylus, unknown hours of use, cantilever slightly off-center:

Technics EPC-205C-IIL_1.5 g_~180 pF_47k Ω_CA-TRS-1007 #1 - Side B_norm1_1_17 Beta.png


JICO SAS with very little use, secured with Blu-Tack, as without it is slightly loose:

Technics EPC-205C-IIL SAS_1.5 g_~180 pF_47k Ω_CA-TRS-1007 #1 - Side B_norm1_1_17 Beta.png
 

mackat

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The technics performance is a bit disappointing - that high end droop should be fixable with loading adjustment...
I have a feeling that at least some of that may have to do with the specific stylus example I have. It may not have been kept in the best environmental conditions in Japan.

At some point, I will pick up an NOS EPS-205EX and measure it.

Additionally, the EPC-205C-IIL model is very low inductance (40 mH)/impedance, as far as I understand to be relatively immune to loading variables.

205CII_s&L-1.jpg
 

Thomas_A

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Col. Panic

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I've attached the code here - just change the extension from ".txt." to ".py". (It looks like the this form doesn't let you upload .py files.) It's just a few tweaks and point solution for this specific task. If there's interest I can modify it to accept an arbitrary number of files and plot them against each other. Let me know if folks would find that useful.
After another evening's work, I wasn't able to make much improvement on the the Rainer response. I can minimize cross-talk adjusting azimuth, which lands me just about where I started. For the frequency response dip between 5 and 10 kHz, I can make up about 0.5 dB with my preamp's maximum capacitive load of 200 pF, but it's a drop in the bucket on the 2 dB problem. I've attached my some documentation on my process in case it's useful to anyone or if anyone has any advice. For now, I think it's as good as I can get it and will slap an EQ on it to fix what's left.

Thanks all, for your help so far!
 

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