Nude Turntable Project

I just went to the URL provided by Aigenga. The photos show exactly what I did, as well, to create an EMI shield for my L07D. However, I never heard any "wum-wum" when the brake activated, either before or after shielding was installed. That site is the one hosted by Howard Stearn, who is an orthopedist by day and an L07D Lover by night.

Halcro,
there might be only one conclusion, get rid of the Raven :-)
isn't it time for a change? I don't know about the value of these modern machines right now. I always went for technology, musicality and a rare design when going for tables. My tables kept the value, they instead increased. I really don't get it why some audio friends pay horrendous amounts for everyday tables which basically copy an originial, to the better?

Lawrence,
It was magnetism......not RFI/EMI that surprised me on the Cu-180 turntable mat?
The Micro Cu-180 is indeed non-magnetic.
My ignorance levels on electro-magnetism run deep.......but I'm guessing that there are materials which can act as 'conductors' whilst others are 'insulators'?
That's why the stainless steel of the 'cradle' I designed became 'magnetised' by the strong magnetic field and why the non-magnetic aluminium platter of the Victor becomes 'magnetised'.....or at least allows the magnetic field to pass through?
The same effect must be in operation with the Micro copper platter even though it is 3mm thick?
I can understand the rubber platter mat being an 'insulator'.......but a 1mm piece of pigskin being a sufficient insulator bowls me over.....
And why a 2mm thick piece of vinyl is NOT an insulator.....I don't know?
I'm sure someone will educate me?
Where's Al when you really need him?? :-)

You're right Thuchan,
There appears to be 10 times more Cu-180 platter mats available for sale.....even NOS ones.....than Micro ever made in their day?

Similar story with the Orsonic headshells....:-)
Aren't the Chinese great?

I tried that droid application for magnetism.
curiosity got the better of me. Some "fun" observations.
I set the magnetism scale to the highest level so the bar would not peak.
Holding my phone in my left hand I took hold of a fridge magnet with my right hand.
I have a boatload of these now leftover from my ET2 magnetic damping experiments.
Sure enough as I brought the magnet closer it would register on the proximity graph.
Sort of like in the movies where they show crew in submarines with radar. As I came in closer the levels would go up.
So it does work - but how accurate is it ?

The sp10mkII first.
While holding it about an inch above the platter away from the cartridge it showed numbers in the 40's.
Turning the power supply on caused the number to jump to the 80's. Now the interesting part.
Pushing start reduced the number to the 40's again.

Lenco. unfortunately this test was ???? as the big magnet laden Dynavector tonearm sits on this table.
It started in the 40's and as I brought my phone toward the mid section of the Dynavector the scale would want to shoot way off.
Which leads me to ask myself. Dynavector is a well respected company. if they thought there was a problem with magnetism would they have built their tonearm to be joined with their cartridges ?

Verdier - the most surprising since it uses two very large magnets (shielded) for levitation. With my phone just above the big platter. The lowest levels observed in the teens and 20's.

Cheers