Fun with vinyl measurements

[Balle Clorin]

Make a movie and observe?

 

[Thomas_A]

Make a movie and observe?

That would be quite difficult.

 

[Thomas_A]

It should be nice to have an accurate calculation to refer to. Does drag+VTA have an impact on VTF or not? Yosh calculations says so, so do this VAM guy. First 50 min about vinyl:

He is correct about many cartridges having large VTAs, also that arm pivot point is a factor. But VTA? Drag is horizontal and should only decrease VTA somewhat but what about impact on VTF?

 

[Balle Clorin]

DIN has a VTA test record on that I get 21 on AT0C9 and 28 in on Shure V15-iv Jico SAS B, running VTA…

 

[Thomas_A]

DIN has a VTA test record on that I get 21 on AT0C9 and 28 in on Shure V15-iv Jico SAS B, running VTA…

Yes. I and shimmed mine to get closer to nominal VTA. Question is if VTA afffects VTF dynamically. Or not.

 

[Balle Clorin]

If so… what are you going to do about it?

 

[Thomas_A]

If so… what are you going to do about it?

If VTF would impact at the level as Yosh formula, one should decrease static VTF. If not, keep it. So question is what is true.

 

[Balle Clorin]

don’t worry be happy,

 

[Balle Clorin]

That would be quite difficult.

 

[Thomas_A]

That part is not difficult. But the effect of drag vill.

 

[Balle Clorin]

Pretty good pink Noise track AnalogMagik V2 pink noise.. the best PN track I have seen so far. For other test I prefer V1 records since they are perfectly flat which minimises disturbances

 

[Thomas_A]

A short comparison using the KAB RF-1, cartridge is shimmed for VTA ≈ 22°, 1 kHz stereo signal from CA-TRS1007.

KAB RF-1 works fine below 100 Hz to reduce warp-related noise. However, it is a bit more noise around 150-300 Hz with the KAB. Since I use two subs in mono, the KAB is not effective when playing over my speakers, only when recording to digital and playing in other systems such as headphone. I will reduce some need for amplifier headroom though.

 

[Aero]

1 kHz stereo signal from CA-TRS1007
Technics 1200GR2 / Non-original headshell "No Name", weight 8.5 grams / Ortofon MC 5000
Pik (999Hz) -11.8 dB
Pik 10 Hz - 45.7 dB

The amplitude of the unwanted resonance (10 Hz) is 33.9 dB below the test signal.

 

[morillon]

1 kHz stereo signal from CA-TRS1007
Technics 1200GR2 / Non-original headshell "No Name", weight 8.5 grams / Ortofon MC 5000
Pik (999Hz) -11.8 dB
Pik 10 Hz - 45.7 dB

The amplitude of the unwanted resonance (10 Hz) is 33.9 dB below the test signal.

View attachment 418849

10hz generated by what?

 

[Thomas_A]

1 kHz stereo signal from CA-TRS1007
Technics 1200GR2 / Non-original headshell "No Name", weight 8.5 grams / Ortofon MC 5000
Pik (999Hz) -11.8 dB
Pik 10 Hz - 45.7 dB

The amplitude of the unwanted resonance (10 Hz) is 33.9 dB below the test signal.

View attachment 418849

If you drop the file in REWs RTA-window what do you get?

 

[Aero]

10hz generated by what?

Every turntable generates unwanted resonance in the range of up to 20 Hz.
The resonance peak can be at different frequencies, it depends on the combination of cartridge compliance - effective mass of the arm.
The smaller the amplitude of unwanted resonance the better.
The size of the amplitude of unwanted resonance depends on many variables......

 

[Aero]

If you drop the file in REWs RTA-window what do you get?

The REV program is too complicated for me.
Here is a sample to measure

1kHz_2.wav

drive.google.com

 

[Thomas_A]

The REV program is too complicated for me.
Here is a sample to measure

1kHz_2.wav

drive.google.com

 

[morillon]

Every turntable generates unwanted resonance in the range of up to 20 Hz.
The resonance peak can be at different frequencies, it depends on the combination of cartridge compliance - effective mass of the arm.
The smaller the amplitude of unwanted resonance the better.
The size of the amplitude of unwanted resonance depends on many variables......

but reading you..not a """resonance"""...
but then there can be elements in resonance with the present frequency... so manage the source... ;-)

 

[Balle Clorin]

1 kHz stereo signal from CA-TRS1007
Technics 1200GR2 / Non-original headshell "No Name", weight 8.5 grams / Ortofon MC 5000
Pik (999Hz) -11.8 dB
Pik 10 Hz - 45.7 dB

The amplitude of the unwanted resonance (10 Hz) is 33.9 dB below the test signal.

View attachment 418849

Please use REW, Audacity often fail to present frequency responses correctly