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RE: beryllium...

Posted by rindolini on June 14, 2011 at 12:18:37:
Yup, beryllium can be quite toxic: Inhaling of particles not recommended! But that's more a problem during manufacturing rather than being a real threat for the user.

Suitability for cantilevers otherwise is about as good as with boron: Beryllium is even lighter, but on the other hand also a tad less rigid - and iirc speed of sound is still a bit higher in boron. However, the main problem with beryllium is the enourmous price - if you check for beryllium foil in comparision to for example gold foil, you'll see what I mean... Hence I could imagine that the main reason for replacing beryllium with boron cantilevers rather was a financial one, with toxicity being just an excuse - 'cause if the usage really was forbidden, Focal/JMlab nowadays shouldn't be able to offer their beryllium tweeters either.

And just to name a few more manufacturers with beryllium cantilevers on some of their carts: Dynavector, Yamaha, JVC, Pioneer, ADC, B&O... uhm... and probably some more I already forgot. ;) As most sophisticated exemplar ever I'd probably nominate the diamond coated, tapered tubular exemplar as used for example on the Yamaha MC1000 - and I think the Accuphase AC3 sports a funky combination of a beryllium rod within a boron tube...

Greetings from Munich!

Manfred / lini

P.S.: I used to have a Yamaha MC505 back in the day - with tubular, tapered beryllium cantilever. A nice little cart. And I still use two types of AT needles with straight beryllium cantilevers on my AT120 and AT102P family bodies - the ATN150E with nice, sharp elliptical and the ATN152LP with LinearContact tip (both rectangular/square shank nudies).