Beryllium

[Ldg]

Perhaps, but standard undergrad physics describes everything you're ever going to need to use here on the forum. And even that, generally, is not familiar to most members. It's all you need, really. If anyone thinks something round these parts can't be explained using conventional undergrad physics, there's something wrong with what they are trying to explain. Not with conventional physics !

[macshifi]

If I remember correctly, Micro Acoustics was the first to use a beryllium cantilever in the late 1970's on some of their cartridges. The reason Shure stopped offering the V15 Vx MR was because their supplier of the cantilevers could no longer make them.

Mark

[bauzace50]

Mark,
thankyou! Good to know. And other cartridge manufacturers used it, and some tweeter manufacturers, also. Needs some more astute observers to locate them and their history.

Thanks!
bauzace50

[davidsrsb]

Take a look at http://en.wikipedia.org/wiki/AlBeMet
This would be a good cantilever material, not brittle like the pure metal, but stiff, no fatigue problems and very low density

[lini]

Well, there used to be quite a few cartridges with Be cantilevers. AT had several models, so did Yamaha. However, one of the first ones probably was B&O's MMC6000. JVC also had a couple, like for example the Z-1 and X-2. Pioneer had at least one (PC1000/II). As most sophisticated Be cantiler ever I'd nominate the one of the Yamaha MC1000, which sported a tapered Be tube with diamond coating. And sometimes BE also was used as coating, like for example on the alu cantilever of the Philips GP922/Z.

Personally I'm very fond of Be cantilevers ever since I had got my Yamaha MC-505 (also with tapered Be tube - no extra coating, though). However, currently I've only got two types of AT needles with BE cantilevers (both straight rods, no coating) in my collection - the ATN150E and the ATN152LP, both pretty good...

And yup, Yamaha has also used it for the tweeters in their NS-1000 speakers. I'm not aware of any others, however - at least not before JMlab/Focal came up with their own BE tweeter much later...

Greetings from Munich!

Manfred / lini

[Dr Pan K]

conventional physics and math apply perfectly in real time situation, earth standards. theres no doubt.

i was just citing some "non euclideian" thoughts that will eventually apply in the future. for those who have interests in physics i would propose a google search on the hail formation and what it implies for the sun (by french physician fourier)

sorry for the off topic

[bogle111]

Well, there used to be quite a few cartridges with Be cantilevers. AT had several models, so did Yamaha. However, one of the first ones probably was B&O's MMC6000. JVC also had a couple, like for example the Z-1 and X-2. Pioneer had at least one (PC1000/II). As most sophisticated Be cantiler ever I'd nominate the one of the Yamaha MC1000, which sported a tapered Be tube with diamond coating. And sometimes BE also was used as coating, like for example on the alu cantilever of the Philips GP922/Z.

Personally I'm very fond of Be cantilevers ever since I had got my Yamaha MC-505 (also with tapered Be tube - no extra coating, though). However, currently I've only got two types of AT needles with BE cantilevers (both straight rods, no coating) in my collection - the ATN150E and the ATN152LP, both pretty good...

And yup, Yamaha has also used it for the tweeters in their NS-1000 speakers. I'm not aware of any others, however - at least not before JMlab/Focal came up with their own BE tweeter much later...

Greetings from Munich!

Manfred / lini

This has been a most informative thread.

I have just been through my cartridge drawer and found an AT32E, AT-F5OCC, (both Be) Yam MC7 (new) but alas I cannot find my JVC Z1 (the only one to draw me away from my Decca London back in the 70's).

These are all as supplied new. So now it is time to see the condition of them, and shall prepare for any disappointment.

One of my favourites is the Tech EPC100 built in headshell on an SL1000. Does anyone here know if this was Titanium as they did a few with this material. I should think that Titanium would be a good alternative to Be, wouldn't it?

I shall still keep the NS1000 fused though.

Regards
Peter

[lini]

Peter: Not quite - titanium is heavier/higher density, not as rigid and its specific speed of sound is lower as well. Hence one would rather go for boron as alternative to beryllium. That said, iirc Technics used both titanium and boron - e.g. on the EPC-P540 (titanium) and EPC-P550 (boron).

Greetings from Munich!

Manfred / lini

[bogle111]

Peter: Not quite - titanium is heavier/higher density, not as rigid and its specific speed of sound is lower as well. Hence one would rather go for boron as alternative to beryllium. That said, iirc Technics used both titanium and boron - e.g. on the EPC-P540 (titanium) and EPC-P550 (boron).

Greetings from Munich!

Manfred / lini

Thank you for that Manfred. I was trying to find out the material used on the Tech EPC100C and remembered I had the manual which states Boron Tapered.

Regards
Pete

[Ldg]

Actually, speed of sound (compression, longitudinal vibration) is irrelevant really. That is so much faster than matters, as to not count. It's transverse (flex) velocity that can have influence. At least as ideals go.