Sorry, Ken, these "red rot" story is a bit different. It does occur on unlacquered instruments rarely, but it does occur a lot on lacquered instruments. Why ? Because many makers, even famous, do not remove the excess solder by hand (scratching it away; enormous extra costs because time consuming), but remove it in an acidic bath. This bath has to be neutralized most carefully, otherwise some particles of the acid may remain on the metal surface & be over lacquered. Then the process of zinc pest can begin.
Ken´s recommendation of oiling the horns inside can be special supported for those players, who produce a very acidic saliva. I am fortunate, as I never had such kind of a problem. And finally: all the recommendation can be made only on an average, not for special situations, climate, etc. ============================================================================================ -----Original Message----- Date: Wed, 04 Mar 2009 13:31:24 +0100 Subject: [Hornlist] RE: Slide Grease and Valve Oil From: "Kenneth Pope" <k...@poperepair.com> To: "h...@music. memphis. edu" <horn@music.memphis.edu> Luke Zyla writes: "About oiling the valves. There are only two bearings on rotor valves.? The rotor surfaces do not touch the sides of the valve casing, so it in not necessary to oil inside the valve.? Adding oil inside the valve only creates a mess that must be cleaned out or diluted by adding more and more oil.? Start by removing the valves and clean them well.? Oil only the bearings upon reassembly.? Your valves will work quickly and need only very occasional oiling on the top and bottom bearings.? Heed Hans' advice and stop over oiling your valves. CORdially, Luke Zyla" Boy, Luke, I couldn't disagree with you more on your advice. To me, the oiling of your horn is less for the sake of providing lubrication on the thrust bearings, but more for PROTECTION from Red Rot. It is when the moisture comes in contact with the Zinc in the brass of your horn that the horn can become more susceptible to dezincification (red rot). A thin film of oil not only prevents this, but it also keeps your horn CLEAN. Of course, it's also a good idea to provide oil for all parts that come in conctact with each other, AND the film of oil will also create a better seal for your valves. If a player finds that their valves are getting slow - that typically is from the over use of the Linkage or Bearing oils (under the cap and by the bumpers). Hans' advice is to stop OVER oiling your valves - NOT to stop oiling them. But, Luke, your advice might be good for my business! :) Sincerely Ken Pope 'Just put your lips together and Blow' Pope Instrument Repair 80 Wenham St. Jamaica Plain, MA 02130 (617)522-0532 http://www.poperepair.com _______________________________________________ post: horn@music.memphis.edu unsubscribe or set options at http://music2.memphis.edu/mailman/options/horn/hans%40pizka.de _______________________________________________ post: horn@music.memphis.edu unsubscribe or set options at http://music2.memphis.edu/mailman/options/horn/archive%40jab.org
