3 New UBER Decks - Is this Turntable's SwanSong? 🦢

While turntables are not easy for the average person to truly compare, especially since they need the same arm and cart, I can relay some of my own experience upgrading tables.

Speed stability is a fantastic thing (listen to some Plangent process digital masterings vs. a standard one and you hear how solid it sounds when tape machine wow and flutter is corrected.

However I’m not sure that’s where the sonic benefits come from comparing well designed tables.

Many years ago I upgraded from a Raven One table that I heavily tweaked. It sat on a Halcyonics active vibration table with a Sistrum stand bypassing the table’s feet. It had a TTW copper platter top/clamp/ periphery ring and tape leader as a belt. It was a fantastic sounding table and taken to another level with tweeks.

I became so enamored with TTW’s accessories, I bought their Momentus Supreme table driven by 3 belts. I was expecting an improvement, but a nuanced one.

I put the same Graham Phantom II arm and Strain Gauge cart on the TTW and I was pretty shocked to hear just how much more dynamic the music was, and how much wider bandwidth it had.

This was just the pure table without vibration table or copper platter top. It was truly eye opening and a good lesson I suppose on how there is no getting around physics, at least as analog goes.

I can only imagine what a cost no object table sounds like..... (of course I’ve set myself up for someone to come back and say.... “it sounds like a $1000 dac”)

I haven’t fired up my Adjust Plus software (a more complex version of the App the measurement in this topic were taken from- but came with a 12” LP) in a very long time, because I’m a Mac guy and it’s PC only, but I’m now tempted to get it going and test out my table’s speed stability.

The Yellow trace is a a long way away from the ideal sine wave, its pretty messy. This TT is not micro speed stable.

So you're basically saying.....with the PlatterSpeed App

• Ignore the numbers
• Ignore the Green Trace (Low-Pass Filtered Frequency)
• Just value the Yellow Trace (Raw Frequency)

Is that correct....?

BTW the TT-101 is one of the TT's that has the subsonic resonance.

Please have the courtesy to show the evidence for this statement...🤥

Dear @halcro : Years ago when every one including you were touted the JVC 101 I posted at least 3 times in those threads ( in your thread. ) that the 101 was an average TT with nothing especial to say Wow.

I know that you was so angry with me because my posts about but its specs are really mediocre/average for a DD unit with a w&f 0.02% and s/n 75db, normal for average TTs. Denons way superior on specs and some of its models came with bi-directional servos too but Denon decided not a good thing and return to single servo including in its top DP-100.

Other that what Richard pointed out a fact is in the price that had the 101 that was low:

The top of the line 801 specs were similar to the average Denon’s: 0.01% and 80db. This unit came with hold down LP mechanism and even that characteristic its price in Japan was 130,000 Yens when the Technics MK3 was ( in the same year. ) 250,000 Yens ( MK2: 150K. ). The 101 was 75K. These data comes from the audio Japan Bible.

Is it a bad TT ? no but you overrated with no clear facts that even today you have not and that’s why you are questioning RK.

Don’t distress about because you are enjoying it and this is what matters to you. So what ! ! the TT still is an average unit and nothing more.

Btw, even with out the RK posts all what I posted here is the same I posted years ago and I just confirmed again. Nothing changed and og course is only an opinion.

R.

Halcro.

I think that the numbers and green graph are useful provided their limitations are taken into account.

Mean frequency....

This is a good number to have. We are looking for 3150Hz, so nice and close to this is desirable.

Raw frequency…

Max deviation. (relative ) This is the max percentage deviation, negative and positive, from the mean frequency. Ideally the two numbers should be the same

Max deviation (absolute) This is the max frequency deviation, negative and positive from the mean frequency. Ideally the two numbers should be the same.

What the deviation numbers do not show is the variation between the deviation of individual positive and negative swings. They all should be the same, (constant amplitude) and for this information we need to refer to the yellow graph.

Lowpass-filtered Frequency.....

This data taken from the green trace. The limitation here is that this trace is heavily filtered version of the yellow trace. And it is very inconsistent from test to test.

Look at the 1000R yellow trace and compare this with the TT-101 yellow trace. There is an enormous difference yet, post filtering they yield very similar green traces  

I have run sequential tests on my SP10 Mk 3 and got Low pass -0.01%/+0.01% followed by -0.02%/ +0.03%. I have outlined some of the reasons for this inconsistency. As I said earlier, below a certain percentage, these figures aren't robust.

Obviously we do not want to see any standout perturbations in the green trace and in this way it can be very useful.

My point is that this data is derived from the yellow trace which is taken from the cartridge output. After all, it is the cartridge’s output that we listen to. To really see how the TT is behaving in fine detail, we need to analyse the yellow trace from the perspective of what a perfectly speed stable TT would look like. A clean sine wave, symmetrically centred around 3150hz with a constant amplitude for each cycle. As we can see, advances in technology have clearly improved the situation.  

 The subsonic speed resonance in the TT-101 can be seen as periodic cycling every 5 revolutions. If you look at the first traces you posted (yellow) , you will see a positive peak just after 5 seconds. This peak appears again just after14 and 23 seconds. The smaller positive and negative excursions in between these peaks follow the same pattern with their 9 second spaced partners. There is a recurring pattern to the shape of this waveform with a period of 9 seconds.  

 

Cheers,