Turn table speed variation question


I've always found that tracks containing sustained piano notes (chords mainly) seem to highlight the smallest variation in platter speed.

However, I do not notice the same speed variations with sustained notes played on any other instruments.

Works well when auditioning turntables, but a PITA when you hit those older, less than stellar recordings, where the tape machine cause the issue.

Wondered if anyone else had the same experience with a different instrument, or is this specific to the piano.

Thanks
williewonka
SME30/12

Here is an attempt to show the SME 30/12 with the Sutherland TimeLine. The only other two videos of the TimeLine that I've seen are Halcro's Victor and the one on the Sutherland website.
Thinking about the original post and other instruments possibly used for evaluation, electronic music or electronically generated signals, comes to mind. The pitch doesn't waver on these tones unless it's done deliberately.
Depending on your musical fare, I've heard records with out of tune pianos.

Standard wow and flutter test signal is a 3150Hz tone evaluated on a wow and flutter meter. This might not be a great test for subjective evaluation unless the table needs a new belt, but electronically generated harmonics with dynamic content, might. Offhand, I can't think of a good candidate though.

BTW, my previous referral to KOB being a 1/4 tone off was off the cuff and apparently wrong. The original record is a little bit sharp.
Regards,
Thanks for the Link Peterayer.....
Not a bad performance from the SME....
This is what any 'good' belt-drive table should be able to achieve?
There is a slight drift backwards of the Timeline mark from the beginning to the end.....but you will notice that he doesn't show the result when the arm is 'lifted' from the record or when it is 'dropped' on the record?
Nor are there multiple arms lifted on and off?
In my experience.....a belt-drive needs to be adjusted for correct speed with the cartridge 'tracking'.
I have yet to see one which doesn't suffer from 'stylus drag'?