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Hello,

Keilwerth manufactures their SX90R models out of either brass or nickel silver. The website at http://www.engineeringtoolbox.com/thermal-expansion-metals-d_859.html gives brass a thermal expansion of around 11 microinches/degree faranheit, and nickel silver a value of around 9. This tells me the risk of tonehole warpage during manufacture is higher on brass instruments than on nickel silver instruments.

Looking at the list of saxophones affected by warped toneholes (http://www.shwoodwind.co.uk/Reviews/Saxes/Tenor/Keilwerth_sx90r_tenor.htm), the nickel silver models (such as the Shadow) seem to fare better than the brass ones. However, this could be because there are fewer nickel silver Keilwerths out there.

If I were buying a new professional model Keilwerth and wanted to reduce my risks of getting one with insurmountable manufacturing defects, would I be better off buying one in Nickel Silver?

Many thanks.
 

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i would go with the nickel silver also have a look what Keilwerth said about it-
http://saxwelt.de/index.php/de/gale...ws-mainmenu-79/gj-keilwerth-mainmenu-139.html

"What would you say is the most important innovation in Saxophone the last decades?
GJ Keilwerth: The most important innovations personally I count saxophones with nickel silver. Their production is made difficult, but they sure stand out by their special sound. "

In another forum (SOTW) is by a person from England repeatedly claimed that the deformation on the tenor SX90R 'rolled tone holes' has, so that the pads do not cover the tone holes on the part perfectly. This Englishman runs really a campaign, it seems to me, anyway. So far, I've never seen an opinion from Keilwerth on this claim. I think the extent of the campaign is bad for business, and I do not understand why Keilwerth not responding.
GJ Keilwerth: With no saxophone, regardless of manufacturer, are planning the tone holes 100%. Therefore, we use pads, which are intended to compensate for small irregularities. Precondition is that the sax is correctly installed.

Why the SX 90 has been set (discontinued)?
GJ Keilwerth: The orders were declining, the demand was only SXR saxophones.
 

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Keilwerth manufactures their SX90R models out of either brass or nickel silver. The website at http://www.engineeringtoolbox.com/thermal-expansion-metals-d_859.html gives brass a thermal expansion of around 11 microinches/degree faranheit, and nickel silver a value of around 9. This tells me the risk of tonehole warpage during manufacture is higher on brass instruments than on nickel silver instruments.
Oh sheesh, another engineering evaluation...

What happens after you get the toneholes sealing and you don't like the sound of the horn? What matters?

Have you read this thread?

http://forum.saxontheweb.net/showthread.php?164181-which-sax-is-better

Go to you local dealer and play 'em. Get you dealer to set up the horn (including leveling the toneholes if that really matters) and move on.

Better yet, get a horn without rolled toneholes.

Better yet, get something other than a J-K. (Hint: There's a Borgani dealer in the UK - look up Borganiboy's recent posts for info).
 

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Just curious.......isn't the nickel silver instrument a brass instrument that has been plated?
 

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Just curious.......isn't the nickel silver instrument a brass instrument that has been plated?
No, it's made of nickel silver - not nickel plated nor silver plated - same alloy as used in student-quality flutes for decades.
 
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