Nude Turntable Project

OK, now I am confused and a bit concerned. I used the Tesla meter to measure stray magnetic fields (as the device tells me) and lo and behold the only area that had high readings was at the top of the platter mostly on the right side of the table. Right where the cartridge tracks the record!

I repeated the measurements with the table grounded and not grounded, with my lead mat on and off, with the platter spinning and stopped, with the power on and off.

I even tried it on a TT-81 that hasn't spun in a year and got similar results! Is this a problem for DD turntables?

There is something in the TT itself that emits a notable magnetic field - I would guess it is the motor. I don't know how to address this but I certainly think that the magnetic operation of the cartridge is affected by this and not in a good way.

I would really like to hear that someone else has repeated this experiment and what they found.

Time to investigate Mu metal and how I can fashion a shield.

Gary

Dover,
I have a stethoscope and have done all the listening you suggest...and more, and hear nothing "revelatory" in regard to 'noise' within my turntable structures.
However this is by no means a scientific or 'white paper approved' form of documentary evidence which laboratory testing could easily provide?
Your use of terms like "noise", "friction" and "vibration" are inexact, undocumented and unquantified.
Hardly a convincing argument regardless of how often you continue to repeat it?

Lewm,

Why re-open the argument?

Errr.....because that is the subject of this Thread? :-)

Incidentally......have you managed to listen to your TT-101 yet?

Now here's a Belt-Drive from the famous Melco brand.
The legendary Melco was a High-End Japanese turntable manufacturer equal to Micro Seiki with cost-no-object products in the 1970s.
This model I particularly like because of the strong skeletal steel backbone 'plinth' which should satisfy Lewm and Dover completely :-)

And here is the equally famous Takai Lab Final VTT-1 belt-drive turntable similar to Dover's.....although he has the Parthenon model I seem to recall which is quite different to this one?
I particularly love the 'Copernican' ideal of the separation of platter and arm-pods.....and this execution appears to be particularly elegant.
Again Dover and Lewm should be well pleased with the 'plinth' arrangement selected here? :-)