DIY TT

The following are a few statements made within a few previous posts, and then low and behold a subjective assessment is all that is required to produce reassuring evidence.

Ones ears are great tools, if the perception of SQ is a detractor, then a stimulation can be created to pursue a furthering of used methods to find a presentation that is an attractor, that can be achieved by a rethink on the methods used for mounting from the Rack Shelve up to the Platter Mat in use.

Out of interest during the Covid lockdown period throuout the globe.

There was a host of posts appear about the perception of improved SQ within systems be noticed.

The period was known as the unprecedented period for using modern HiFi, as the Grid Power Supply was not being drawn on in a capacity that is usual, and the reduction in Traffic and Transport Services had substantially reduced seismic activity, the seismic monitoring stations was reading this drop in vibration. 

Again a group of individuals across the world detecting change through subjective, evaluation, with a little bit of additional ambient environment being known of to make the claims seem feasible.

I do not recall any of the contributors to a thread needing to supply data from recorded measurements of their own systems to prove their reports being substantiated, the ears were looking good enough, and the trend for the reporting maybe produced an increased awareness to the attractive perception that was present.   

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Seems that your statement is mainly subjective and I think that you need to measure as @mijostyn posted, I' agree with him .

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Dear @vinylzone  : " I do not have any vibration or rumble issues in my setup, "

How do you know, how can you be so sure?

I ask because time ago I was sure that my analog rig was free of any kind of generated distortions related as what we are discussing here with you.

A few months ago my friend Carlos came to my place and we were listening MUSIC, mainly classic because he is a Simphonic Orchestra player. Obviously that he is accustomed to listen at high SPL as in a live even seated at near field. So in one LP ( non classic score but Asian drums. ) with SPL over 95db and with a low bass reproduction part the windows started to vibrate... after that I told you Carlos if that vibrations affected the other frequency ranges ( mid/high ) sk if he detected " something " and like me he told me that does not detected any kind of " problem " about.

I took that experience as a confirmation that my analog rig was safe of that kind of " events " 

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The most commonly used vibration measurement methods, which are using  accelerometers and laser devices as the methods to measure are not suitable for vibration measurement of micro vibrations. The methods referred to as Optical interferometry has the advantages of being a non-contact system and measures to a very high accuracy.

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There was a host of posts appear about the perception of improved SQ within systems be noticed.

The period was known as the unprecedented period for using modern HiFi, as the Grid Power Supply was not being drawn on in a capacity that is usual, and the reduction in Traffic and Transport Services had substantially reduced seismic activity, the seismic monitoring stations was reading this drop in vibration.

Again a group of individuals across the world detecting change through subjective, evaluation, with a little bit of additional ambient environment being known of to make the claims seem feasible.

It is possible that people with nothing to do were more attentive to the music, in general, because they had less on their minds… or just to escape the drama. And perhaps they believed that it sounded between because they listened better?

The most commonly used vibration measurement methods, which are using accelerometers and laser devices as the methods to measure are not suitable for vibration measurement of micro vibrations. The methods referred to as Optical interferometry has the advantages of being a non-contact system and measures to a very high accuracy.

If someone (like @vinylzone ) had another system available…

Then they could:

• Power the speakers with system #2, running it hotter than normal.
• Put the stylus on a non spinning table
• Listen, or record, what is coming through the TT system… as any vibs will be shaking the interface between the cart and turntable.

I would expect that low freqs would bleed through, with their higher amplitude… but who knows?

If something was coming through, then repeat the test with System #2 playing pink noise and we could then figure out the freqs that the systems is most prone to resonating at, and what the apparent Q is.

There might be other ways, but this seems pretty quick if one can disconnect the phono stage and has a ADC to record with.

It is possible that the musical signals could be coupled into the phono units electrically… but keeping the phono stuff away from the other cables should help.

it is somewhat better than the laser gear, as if the plinth was stable and the arm was being shaken we still get a measurement… and visa versa.
And if they are both in a common mode, then any “CMRR like” effect would result in low apparent vibration.

And they could do the pink noise testing at 70, 80, 90, 100 dB… to further understand it. 

Have you ever given LENCO TTs a thought? When rebuilt and mounted on new plinths, these offer superb performances....I know because I have two such TTs. One is from an old Lenco L70; the other from a L75. Both are fitted with quality Jelco tonearms and they simply sound wonderful.

Have you ever given LENCO TTs a thought?

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Yeah - there was a fellow in SF that has an older one in 240v, but that went a bit cold. I might reach out again, as if I just do the Eclipse/roadrunner on the Sota I could run it while the Sota is belly up.
 

@holmz The link might bring a few hours of interest with a cup of coffee in hand.

Best Coffee and not whiskey, as the latter does have a habit of making big decisions very easy, on a more than wanted frequency.

PM me if you would like a further description about the link. 

https://www.fromjapan.co.jp/en/