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The usual solution seems to be to replace the bumpers--they harden over time and tend to make that sound when the stop hits the bumper.

bdjwill wrote:I just looked at my rotary valve. It seems that the alignment is slightly off on it. Could that be the cause of the problem?

Did you have a look at the rotor bumpers, too?

Don't forget to check out the linkages. I often get clacking when the grease dries out of the old ball joints. Are you running the rotors in plenty of oil? When I first got my rotary valve Yamaha the horn players in orchestra advised me to have them "swim in oil".

bdjwill wrote:I just looked at my rotary valve. It seems that the alignment is slightly off

How did you decide the alignment is off? And did oil/grease fix the clacking?

Take the time to go through these videos. A lot of very useful information and demonstrations that will likely help your problem.


http://www.uni.edu/drfun/repair_video/r ... index.html

Now that looks like fun!

bloke wrote:hey...You think you've got problems...

Now, which slide is it, exactly, that one pulls for a C#² ?

That's amazing -- I had no idea MC Escher was a brass player!

bdjwill wrote:

windshieldbug wrote:How did you decide the alignment is off? And did oil/grease fix the clacking?

On my horn, there's a line that should line up if it's in alignment.

And yes it did after a while of playing.

MAGIC