I believe that what Larryi is referring to, is the warning about what phono preamp characteristics can damage the cartridge, in a review on 6moons.com
Here is link to the review in question.
6moons review of MC2 Cartridge
And, here is a portion of the review, if you don't want to go to the site.
"And now for a dire word of warning: your phono stage may well be an Allaerts killer. All of them from the MC1B up have incredibly thin coils. If there is any DC kickback in your phono stage or other funny stuff, it will melt the coils and you are looking at a seriously expensive rebuild. Melt the coils? Yes. They are 20 micron thick pure 24 carat gold. I wouldn't even hold them too close to a hot lamp.
The melting coil issue has happened to several owners. It is your responsibility to make sure the phono stage you use is going to leave the cartridge intact (see what I mean about high maintenance?). Now of course I worry about lightning storms. There must be DC kickback there so I unplug from the phono stage. And with the Groove, I turn it on at least 2 hours before connecting up the cartridge leads. So far, fingers crossed, that seems to work. If in doubt, get in contact both with your phonostage designer and with Jan Allaerts to see if there are issues before there are issues. Then there is the phonostage loading issue. Both the Finish and the Formula One are very choosy about phonostages. They want to see an imput load of 845 ohms (pretty exactly) and can be very unhappy if they don't. In fact they can sound thin, compressed and lifeless if not looking at close on the right load. But the gains when getting it right are in the 'promised land' territory. These cartridges have some very serious following. Isenburg in Germany is so obsessed that he built a state of the art (15,000 euro) phonostage specifically for these two cartridges. That's how deep the devotion for these cartridges can go."
I too have read nothing but glorious reviews of the Allaerts, and a friend (from another city) has one and loves it. (I have not gotten to listen to one myself, although I wish I could!) Also, realize that the Allaerts have really, really low outputs, (usually around 0.1 to 0.2 mv) so a really high gain (70db+) are required. This "usually" means using a solid state phono preamp.
Good Luck in your search.
Here is link to the review in question.
6moons review of MC2 Cartridge
And, here is a portion of the review, if you don't want to go to the site.
"And now for a dire word of warning: your phono stage may well be an Allaerts killer. All of them from the MC1B up have incredibly thin coils. If there is any DC kickback in your phono stage or other funny stuff, it will melt the coils and you are looking at a seriously expensive rebuild. Melt the coils? Yes. They are 20 micron thick pure 24 carat gold. I wouldn't even hold them too close to a hot lamp.
The melting coil issue has happened to several owners. It is your responsibility to make sure the phono stage you use is going to leave the cartridge intact (see what I mean about high maintenance?). Now of course I worry about lightning storms. There must be DC kickback there so I unplug from the phono stage. And with the Groove, I turn it on at least 2 hours before connecting up the cartridge leads. So far, fingers crossed, that seems to work. If in doubt, get in contact both with your phonostage designer and with Jan Allaerts to see if there are issues before there are issues. Then there is the phonostage loading issue. Both the Finish and the Formula One are very choosy about phonostages. They want to see an imput load of 845 ohms (pretty exactly) and can be very unhappy if they don't. In fact they can sound thin, compressed and lifeless if not looking at close on the right load. But the gains when getting it right are in the 'promised land' territory. These cartridges have some very serious following. Isenburg in Germany is so obsessed that he built a state of the art (15,000 euro) phonostage specifically for these two cartridges. That's how deep the devotion for these cartridges can go."
I too have read nothing but glorious reviews of the Allaerts, and a friend (from another city) has one and loves it. (I have not gotten to listen to one myself, although I wish I could!) Also, realize that the Allaerts have really, really low outputs, (usually around 0.1 to 0.2 mv) so a really high gain (70db+) are required. This "usually" means using a solid state phono preamp.
Good Luck in your search.