Direct Drive vs. Idler Drive vs. Belt drive

@terry9 

I have no source for graphite
As i can see The Mat is not pure graphite, it's different carbon graphite material, so the thickness is just 4mm and cheaper that previous versions made by Boston Audio. 

Another mat made from  extremely high grade of polycrystalline graphite
is OMA Graphite Mat  (6mm thickness), but i never tried this one myself, too expensive.    

@chakster , graphitestore.com helped me with expert advice and a good product at a very fair price. I was told that they have provided platter mats before, but never as thick as an inch.

My big iron platter rings at 500Hz, the graphite top rings at 2000Kz, and the combination is dead as a tomb.

2000Hz

Terry9

How did you test for ringing?  A test record and your ears or some sort of test equipment?  Seeing those frequencies are at the heart of the midrange what did you hear when you played music.  I am truly curious.

Thanks
Tom

@tomwh , Suspended the pieces with string or rope and tapped with a small piece of softwood. It was easier to match the frequency to piano keys than to set up a microphone, Revox, and frequency counter; and my spectrum analyzer is old and too heavy to move around, and not necessary for this. On the piano, the fundamentals were one and three octaves above middle C.

When the two were stacked on the spindle, the combination was dead, dead, dead. So when I play music, no colouration of any kind.