Dear @halcro : Well, in your list of cartridges that are not any more with you all them have something in common: all came from different DESIGNERS that along other contemporary top LOMC ones all choosed boron build material for their cartridge designs and as edgewear pointed out to you the quality performance levels of many of those designs are really great.
In the other side the market today very high price of LOMC cartridges is not way different that in the past where the top models had a very high market price for the market standards in those old times when existed a way way higher demand for cartridges against the very low number of today audiophiles that buy today LOMC cartridges.
As @dover and several other gentlemans I don't buy a cartridge because its cantilever builed material and in specific if it's boron or beryllium with the vintage ones.
I think that what you did not like it of your list cartridge performance is its overall quality levels that just is different from your audio/music priorities but not because boron.
In the side of beryllium vs boron where you prefer beryllium it's the same but not because in specific of beryllium that's inferior to boron as cantilever material: beryllium Moh hardeness a low 5.5 vs 9.3 in boron and Young Modulus is almost the third of the boron. Two critical parameters for the cartridge cantilevers needs.
Btw, it's really weird that you can't be aware if you are listenin to a MC cartridge or at MM/MI one. Maybe could be because your room/system can't " tell you "?
Please do not diminish my next advise: could be that when you decide to make a really easy tests with the Wima/Kemet caps in your speakers you will listen those differences that exist between MC and MM/MI cartridges. Those Duelund are high colored caps.
R.
In the other side the market today very high price of LOMC cartridges is not way different that in the past where the top models had a very high market price for the market standards in those old times when existed a way way higher demand for cartridges against the very low number of today audiophiles that buy today LOMC cartridges.
As @dover and several other gentlemans I don't buy a cartridge because its cantilever builed material and in specific if it's boron or beryllium with the vintage ones.
I think that what you did not like it of your list cartridge performance is its overall quality levels that just is different from your audio/music priorities but not because boron.
In the side of beryllium vs boron where you prefer beryllium it's the same but not because in specific of beryllium that's inferior to boron as cantilever material: beryllium Moh hardeness a low 5.5 vs 9.3 in boron and Young Modulus is almost the third of the boron. Two critical parameters for the cartridge cantilevers needs.
Btw, it's really weird that you can't be aware if you are listenin to a MC cartridge or at MM/MI one. Maybe could be because your room/system can't " tell you "?
Please do not diminish my next advise: could be that when you decide to make a really easy tests with the Wima/Kemet caps in your speakers you will listen those differences that exist between MC and MM/MI cartridges. Those Duelund are high colored caps.
R.