It took awhile but I read the whole thing.Good grief....a marathon session 🥴
Did you only READ the whole thing @sdrsdrsdr...or also LISTEN to all the recordings?
I know you wrote that you’re not setup to listen properly....but are you able to listen AT ALL?
Regarding the AT-ML180/OCC.....the OCC stands for Ohno Continuous Casting process
In 1986 the Ohno Continuous Casting (OCC) Process was developed by professor Ohno of the Chiba Institute of Technology in Japan. The wire made by this process is claimed by our manufacturer to be 99.999 % pure and in our thinnest wire size (50 micron) that it has one crystal boundary per 6.5 km on avearge. Normal wire has a number of contaminants particularly Oxygen, Sulphur, Lead, Antimony and Aluminium and is typically 99.97% pure and has a cristal boundary perhaps every 10 mm.This, from a knowledgeable audiophile:-
OFC is Oxygen Free CopperIn the latter part of the ’80s.....Beryllium was declared "unsafe" to work with in some processes and cartridge cantilever manufacturing is one of these, hence....no modern cartridges utilise Beryllium.
OCC is Ohno Continuous Casting
Oxygen free is a good thing because it is corrosive. Just a high purity copper will do fine thanks.
Professor Ohno devised a method so there would be no or few boundaries in the copper.
In theory both of these are a good thing but the effect is really tiny and probably inaudible.
The OCC in particular is hardly relevant. Every solder joint or RCA or banana connection will have vastly larger breaks and I am skeptical that it is possible to audibly detect misalignment in the copper boundaries.
OCC and OFC are independent of whether Beryllium or Boron is used.
On the original packaging of my AT-ML180/OCC....you can see the SEPARATE LABEL stating that it came with a "Gold-Plated Boron Cantilever".
This label obviously covers the original proclamation of BERYLLIUM CANTILEVER.....
That’s the model I will continue to seek...🧐
Regards