A flat is first valve on the euphonium.
On a standard Bb trumpet, the fingering for a bottom-line Eb is 12 and the fingering for all higher Ebs is 2.
The Euphonium's range is the same as the Bass Trombone starting in the Bass Clef ranging from B Flat 1 below the Bass Clef to B Flat 1 above the Bass Clef.
Same as B-flat.
1 and 3
it is the first valve
PU*SY
On a standard Bb trumpet, the fingering for a bottom-line Eb is 12 and the fingering for all higher Ebs is 2.
On a standard Bb trumpet, the fingering for Ab is 23.
Both are most commonly in B-flat.
The Euphonium's range is the same as the Bass Trombone starting in the Bass Clef ranging from B Flat 1 below the Bass Clef to B Flat 1 above the Bass Clef.
2nd and 3rd valve
Same as B-flat.
1 and 3
it is the first valve
There is no "F-Flat", it's E-Natural (second valve)
On a standard Bb Trumpet, the fingering for a low Eb is 23 and the fingering for higher Ebs is 2.
Same as B major