Yes, for Bach & Yamaha and most horns, 9 o'clock is correct, assuming of course that you hold the horn with the bell underneath and the mouthpiece to your left...

If you take out a valve and look into the casing, you will see two notches for valve guides. One will always be wider than the other. Match the notches with the width of the brass or plastic protruding guides on the valve, and you can't go wrong.


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