Frequency Response Test Records

[Thomas_A]

I re-glued the stylus. According to my calculations, the SRA is 94 degrees. Is that accurate? How much would you calculate based on this photo?

While you could say there is a rake angle, this angle would not matter for a conical stylus.

 

[Balle Clorin]

@aaaakkkk Google ICmeasure

 

[aaaakkkk]

@aaaakkkk Google ICmeasure

Thanks, two rulers are better than one. : )

 

[Balle Clorin]

see also Wally Tools YouTube on how to use a straw to minimize parallax error

 

[aaaakkkk]

While repairing a damaged Shure M97xE cartridge cantilever,
I obtained some rather interesting measurement results with SRA=97 and VTA=26.
L = X-talk @1kHz: -32.58dB (CA-TRS1007)
R = X-talk @1kHz: -33.05dB (CA-TRS1007)

The first graph shows the result after soaking the insert in alcohol for one week, then in kerosene for one week, with drying in between.

The second graph shows the result after gluing the cantilever.

The third graph shows the result after soaking in isopropyl alcohol.

 

[Thomas_A]

While repairing a damaged Shure M97xE cartridge cantilever,
I obtained some rather interesting measurement results with SRA=97 and VTA=26.
L = X-talk @1kHz: -32.58dB (CA-TRS1007)
R = X-talk @1kHz: -33.05dB (CA-TRS1007)

The first graph shows the result after soaking the insert in alcohol for one week, then in kerosene for one week, with drying in between.

The second graph shows the result after gluing the cantilever.

The third graph shows the result after soaking in isopropyl alcohol.

Not sure I understand. What was the stylus in the first one? The old one? A little more information. And why did you soak them?

 

[aaaakkkk]

Not sure I understand. What was the stylus in the first one? The old one? A little more information. And why did you soak them?

Initially, the stylus was as shown in graph 2.
Under the microscope, it was clear that the damper had become smaller over 12 years.
I decided to soak it and see what the results would be.

 

[Thomas_A]

Initially, the stylus was as shown in graph 2.
Under the microscope, it was clear that the damper had become smaller over 12 years.
I decided to soak it and see what the results would be.

Ok then I get it.

 

[Balle Clorin]

I was concerned about the droop my Jico stylus show so I had to test.
Same cartridge sHURE V15-IV JICO SASB (WITH UNUSUAL DROOP? usually Jicos have a peak) and Clearaudio CA-TRS-1007 worn vs a JVC TRS-1007
JVC 0.8DB HIGHER 0.02 BALANCE L&R
CA LEFT 0.2DB HIGHER THAN RIGHT


CA TRS -1007 is -as shown before- is a pretty good alternative to JVC, the best obtainable sweep record today.

The droop i have maybe a suspension variation, but it actually look very similar to the original stylus the test from the 80s..

Interchannel phase difference ... Left and Right outer track

 

[Thomas_A]

And the Sperling results given the same setting?

 

[Balle Clorin]

Last alignment: Project protractor alignment disk+ AnalogMagik zenith/imd track+ Shure TTR-109 for azimuth xtalk.
If I force Sperling record result closer to zero - twisting cartridge counterclockwise- I get terrible IMD result and cartridge is twisted far out and do not align with protractor.

 

[Thomas_A]

Hm so you end up negative phase both for JVC and Sperling. But JVC perhaps at -2 and Sperling -1 degree at null points. I got this with latest alignment.

 

[Balle Clorin]

And cartridge still look reasonable aligned…?
I have a AT540ML I can investigate on my Fisher TT one day. Maybe I get results more like you.
By the way my Sperling record is no 54 of 300.
I am getting a Dr Feickert protractor on loan this weekend..

 

[morillon]

And cartridge still look reasonable aligned…?
I have a AT540ML I can investigate on my Fisher TT one day. Maybe I get results more like you.
By the way my Sperling record is no 54 of 300.
I am getting a Dr Feickert protractor on loan this weekend..

The first series apparently had a manufacturing defect...
(it's mainly useful for checking the installation distance, not for protactor..so many anothers solutions for this use..)

 

[Thomas_A]

And cartridge still look reasonable aligned…?
I have a AT540ML I can investigate on my Fisher TT one day. Maybe I get results more like you.
By the way my Sperling record is no 54 of 300.
I am getting a Dr Feickert protractor on loan this weekend..

I tried three settings and I checked with the Moerch arc protractor at the extreme ends. All of them were on the arc but the last try the cart is a bit twisted clockwise. A straight mounted cartridge does not give me correct shape of curve when it is aligned on the arc. Also checked my arm jig and it is on spec 212 mm. I can get it to be a bit negative but it is all dependent both on position and twist.

Was thinking to check what the square wave gives on both sides of my Ortofon and my Flukason gives. Have not checked yet the distance to to the track to center. Another day.

 

[Thomas_A]

Last alignment: Project protractor alignment disk+ AnalogMagik zenith/imd track+ Shure TTR-109 for azimuth xtalk.
If I force Sperling record result closer to zero - twisting cartridge counterclockwise- I get terrible IMD result and cartridge is twisted far out and do not align with protractor.
View attachment 511498

View attachment 511500

Which Project protractor is it? The arc one?

 

[morillon]

Arc protractor generator | AlignmentProtractor.com

Print or download a free custom arc protractor for accurate phono cartridge alignment. Reduce distortion with proper turntable setup!

alignmentprotractor.com

 

[Balle Clorin]

Which Project protractor is it? The arc one?

Standard 2 point, I I believe it should work for any arm , but maybe not? . To get zero phase diff I need to twist the cartridge severely ccw , and that increase AnalogMagik IMD distortion a lot too.
Like this, zero phase diff; poor protractor fit poor IMD

6 degrees adjusted

My arm is Denon 244 mm

 

[Thomas_A]

Standard 2 point, I I believe it should work for any arm , but maybe not? . To get zero phase diff I need to twist the cartridge severely ccw , and that increase AnalogMagik IMD distortion a lot too.

Ok. I notice that the arc method has a better accuracy. I can set it with the two point looking good but being a bit off at the very beginning or end of the arc. I will be back with some more. The shape of my curve is still not perfect. Also when twisting I need to adjust position in headshell as well to get it perfect in the arc.

 

[Balle Clorin]

The phase diff curve is not identical to the angle error curve due to the radius effect…I posted a comparison earlier….you need to compensate for the radi and rpm , I have an excel sheet for that