Nieuwguyski, on Bb T-bone in bass clef, I play 2nd space C# in 5th position and on first ledger line above bass clef in 2nd position. The Conn / King charts are online in PDF format accessible readily with Google search.
As well as about every audience knows the music sound of Silent Night, on Christmas Eve 2011 I performed a euphonium solo rendition of it here in Jackson NC for the caroling held at the Courthouse gazebo. I believe if my fingering had been wrong, I would have been "tarred and feathered" out of town. This is the tarheel state and there are several Perdue chicken houses nearby where the public could have got the feathers.
Well, I'm still here! I will say I was exhausted as follows in my recovery from major heart surgery. Otherwise, I really like the rendering of this song as a euphonium solo and also likewise Amazing Grace which the public knows well also.