Frequency Response Test Records

[stereoplay]

Balle,

I only own the CBS STR-112. With the AT33-PTGII I measure following values:

 

[JP]

Which version STR-100?

 

[stereoplay]

STR-112

 

[JP]

I thought Balle said STR-100. I remembered incorrectly.

 

[Balle Clorin]

Balle,

I only own the CBS STR-112. With the AT33-PTGII I measure following values:

View attachment 282625

Strange I Get 30% on +6 on STR 112 on the same cartridge.. and 6-7% on STR-111. Using REW with Generator set to 400hz :4000hz 4:1 and import file in RTA window. Wye record was sealed NOS and supposedly unused. Recording flat with no RIA

If I may ask, how does your FFT look like?

Not sure why REW reports -20db sidebands at F2-F1 and F2+F1 as about 30% IMD( and not 10%) .

REW gives sidebands -20db below F2

 

[stereoplay]

Balle,

sorry for confusing you. No worry about that high figures. I showed the FIM measurements, which is no AM modulation.
It exists a mathematical conversion (Bessel) to the IM you measured with REW. But REW is not best to measure IMD your way, because you don't use the built in signal generator. Slight frequency deviations and speed changes leads to wrong calculations. See the picture below (f!=4000Hz)

I show you both measurements FIM and IM in comparison (Ortofon Red):

 

[Balle Clorin]

Can you please tell what I should use and how to calculate the «correct» IMD, ?
I think some old Issues of American Audio state to use a IMD meter and to look at the first sidebands.
Many Thanks,

PS cannot find any definition for FIM

 

[stereoplay]

First I would measure the 400Hz/4KHz components exact frequency. If it is e.g. 390Hz/3950Hz use this as the two "generator frequencies" in the REW settings and measure again.
This could maybe help.

FIM was used in Germany as a kind of standard. It can be measured with the EMT 424 --> https://emt-archiv.de/emt-424/

I have only German descriptions:

https://www.radiomuseum.org/forum/messschallplatten.html here under Verzerrungs-Meßschallplatte nach DIN 45 542


and as a example:

 

[Balle Clorin]

Thanks I will try.. did reduce IMD form 30% to 10%

I once had this software the could build electronic blocks and simulate them and give an output, cannot find it of remember the name

but what would be cool to have is this

 

[Balle Clorin]

Page 42

https://worldradiohistory.com/Archive-All-Audio/Archive-HiFI-Stereo/70s/HiFi-Stereo-Review-1979-01.pdf

 

[Balle Clorin]

A new test record arrived, all in good condition

 

[USER]

Early birthday present:

 

[morillon]

and me a new ttr117 just to check if my intuition concerning the possible interest of his "tri-tons" for the experiments concerning the observation of the wear of the thread "on the side"..( and the "ccif " of the srt-14a)
I look very stupid when I see what I already had on the shelves...""one more""..
hihi

 

[Balle Clorin]

Early birthday present:
View attachment 294044

Jøssenamn ,, How did you manage to Get hold on that. !!

 

[USER]

Jøssenamn ,, How did you manage to Get hold on that. !!

I was able to get one of two NOS that popped up on discogs a few weeks ago. There is a used one there now (VG+ condition, seemingly well used) but I don't know if I'd go for it as shipping is expensive to the US.

No Artist - Din 45 543 Frequenzgang- Und Übersprech-Mess-Schallplatte Für 33 1/3 UpM

View credits, reviews, tracks and shop for the 1979 Vinyl release of "Din 45 543 Frequenzgang- Und Übersprech-Mess-Schallplatte Für 33 1/3 UpM" on Discogs.

www.discogs.com

 

[USER]

DIN 45 543 & Clearaudio TRS-1007

SIDE A

SIDE B

BONUS SHURE TTR-102

A FEW MORE:

CBS STR-100

DENON XG-7001

SECOND CLEARAUDIO TRS-1007 (NEEDS FLATTENING)

 

[Balle Clorin]

see page 42
https://worldradiohistory.com/Archi...iFI-Stereo/70s/HiFi-Stereo-Review-1979-01.pdf

 

[DrCWO]

DIN 45 543 & Clearaudio TRS-1007

SIDE A
View attachment 294506

SIDE B
View attachment 294507View attachment 294509

View attachment 294508View attachment 294511

BONUS SHURE TTR-102
View attachment 294599View attachment 294600
A FEW MORE:

CBS STR-100
View attachment 294635View attachment 294636
DENON XG-7001
View attachment 294637View attachment 294638
SECOND CLEARAUDIO TRS-1007 (NEEDS FLATTENING)
View attachment 294639View attachment 294640

Your post shows different measurement results for ShureV15 V-MR and CA-TRS-7001.
I like to know what the reason for the differences is? I cannot read that out of the legend.
As I am waiting for my CA-TRS-7001 to arrive and I also got a Shure V15 V-MR with a fresh NOS stylus ($$$ ouch) I like to know what can be achieved if the pickup was adjusted correctly.
Best DrCWO

 

[USER]

Your post shows different measurement results for ShureV15 V-MR and CA-TRS-7001.
I like to know what the reason for the differences is? I cannot read that out of the legend.
As I am waiting for my CA-TRS-7001 to arrive and I also got a Shure V15 V-MR with a fresh NOS stylus ($$$ ouch) I like to know what can be achieved if the pickup was adjusted correctly.
Best DrCWO

I believe the dip at the end of the FR on that measurement is related to a bit of warping issue the record has. Flattening it with a record flattener should help. This happens with test records unfortunately as it is a negative issue of the medium. You can't expect perfect results but that's ok.

Also note that there *may* be some Shure V15 V-MR cartridges (styli) that exhibit a bit of a downward slope. I have seen this when comparing over 6 styli. Two distinct patterns. It may be related to manufacturing changes. I will test this again one day in the future with my current, finalized set up so it is just a theory for now. The above is not that phenomenon however.

 

[Balle Clorin]

New arrival. Denon XL-7004/7005/7006.According to some sources XL-7004=XG-7001

No Artist - Audio Technical Records

View credits, reviews, tracks and shop for the 1973 Vinyl release of "Audio Technical Records" on Discogs.

www.discogs.com

Looks interesting with 30 page booklet , maybe I can run some sweeps tomorrow.

Sweep has low turnover frequency of 250hz acccpring to Google translate

Booklet shows a plot of skating force across record that I have not seen before..