Introducing the Phono Cartridge Measurement Library

[Balle Clorin]

View attachment 341519Interesting difference , does not like mine at all..I will try a different RIAA with lower capacitance

With Puffin, should be 50pF + cable 125pf. I think something is wrong with ,y V15 IV SAS-B, every time I test it is becomes worse

Adding 220pF does this- red curve

See also post 774.

 

[Thomas_A]

With Puffin, should be 50pF + cable 125pf. I think something is wrong with ,y V15 IV SAS-B, every time I test it is becomes worse
View attachment 345224



Adding 220pF does this- red curve
View attachment 345226
See also post 774.

Hm. Yes it is not the common reponse. But to me it does not seem worse. You have a drop of 1-2 dB 10-20 kHz. Did you recheck SRA at 1 vs 1.5 g? Otherwise 60-70 kOhm would give you a lift in the high end and a perfect linear response. Distortion is -35 dB at 5 kHz which is fine.

 

[Balle Clorin]

But how can I make my 47kohm input 60k+? adding series resistance via a plug? / and accept the voltage divider it creates.
RIAA is Parks Audio Puffin,( could EQ by PSP but it is fun to do it the old way)

 

[aaaakkkk]

With Puffin, should be 50pF + cable 125pf. I think something is wrong with ,y V15 IV SAS-B, every time I test it is becomes worse
View attachment 345224



Adding 220pF does this- red curve
View attachment 345226
See also post 774.

Can you measure the length of the cantilever, maybe it is shorter than usual? The mass and length are smaller, the mechanical resonance of the stylus is smaller, hence the decline.

 

[Balle Clorin]

I thought a lower effective tip mass would raise the resonance frequency?

 

[aaaakkkk]

I thought a lower effective tip mass would raise the resonance frequency?

 

[Thomas_A]

But how can I make my 47kohm input 60k+? adding series resistance via a plug? / and accept the voltage divider it creates.
RIAA is Parks Audio Puffin,( could EQ by PSP but it is fun to do it the old way)

Well you can”t raise it with plugs, I believe. I do know that the resonance can be a bit different, both frequency and Q. Did you check up to 50 kHz? Another RIAA stage?

 

[Thomas_A]

I thought a lower effective tip mass would raise the resonance frequency?

Perhaps the stylus mechanical resonance is just above 20 kHz in your case. You could look at it but without changing R you can only raise the top end within limits. 300 pF/47 kOhm could be a compromise, but it would be better if you could raise it to ≈60 k.

 

[Balle Clorin]

Spoiler: FOR THOMAS A

Similar response with other RIAA at same total load

Adding Puffin AIR=2 does this att 160pf 47k

AIR=1

Cheating by using puffin AIR=2 and NO extra capacitance. cable 125pf + Puffin 50pf=175pF 47k Left and Right

 

[stereoplay]

But how can I make my 47kohm input 60k+? adding series resistance via a plug? / and accept the voltage divider it creates.
RIAA is Parks Audio Puffin,( could EQ by PSP but it is fun to do it the old way)

You can do exactly what you proposed to do.

Here is an example with a very poor AT12XE with new needle. MM-Input stage capacitance 50pF + 70pF cable + 30pF internal wiring. Input resistance is 47k.

Adding 27k in series (and after compensation of the 3,9dB loss):

Adding 220pF in parallel to the 27k (compensation of high frequency loss):

Remark: I inserted the network after the internal wiring (30pF). So the network sees 50pF and 70pF=120pF. To compensate the high frequency loss use the following formula for the capacitance:

C=47k/27k*120pF

 

[JP]

Lyra Kleos with about 10 hours of use. TRS-1005 3A1 is an outer track, and 1B9 is an inner track.

I can't adjust azimuth as this is aligned for someone else's setup. It looks like it'd be about -35dB.

 

[Balle Clorin]

Is this test record defects or cartridge defects?
How does it look with CA TRS-1007?

 

[Thomas_A]

Lyra Kleos with about 10 hours of use. TRS-1005 3A1 is an outer track, and 1B9 is an inner track.

I can't adjust azimuth as this is aligned for someone else's setup. It looks like it'd be about -35dB.

View attachment 345783
View attachment 345817

View attachment 345782

Odd result. Wonder if it is intentional or just something with this one.

 

[mfalcon]

I have a Kleos but waiting on a CBS test record in the mail. Use the higher frequency on the Ultimate Turntable Setup disc mine doesn’t look like this. I’ll post a measurement hen I get the test record

 

[narud]

what am i not seeing here that looks odd? the 1007 plots look pretty normal i think and the 1005 plots drop between 20k and 50k. is that out of the ordinary?

 

[Balle Clorin]

The unusual frequency scale fooled me. The double peak 10k+ and the wiggles and droop below 10k is something I notice

Arm resonance at 500hz?

 

[mfalcon]

the plot going to 50k threw me too. I was wondering, “what is that funky roll off”.

 

[DSJR]

Lyra's do seem to be a bit toppy as a breed and I was told to set them up at a smidge over 2g downforce..

It was once suggested that Japanese vinyl was 'springier' than EU or US types (may be an old wives tale but i posit this thought anyway) and as a result, the rake angle of far eastern stylus assemblies was nearer 28 degrees than the 15 - 20 of EU types. The extra distortion measured in these former cartridges also indicated the excess (for EU/US tastes rake angle relative to the groove. Adjusting VTA simply isn't possible here as it's too much.

 

[Balle Clorin]

Jico SAS-B is 30 degrees VTA...it least the ones for Shure V15 IV

 

[Thomas_A]

Jico SAS-B is 30 degrees VTA...it least the ones for Shure V15 IV

This is even higher given the mount of stylus