Hey, I have run into both low B problems recently. The first, the low B closed with it's key but not completely with the Bb key. Here, more felt was required (or a slight bending up) of the B tab under the Bb key.
The second was the B closed with the Bb key but not with it's own key. Here, the B tab of the G# key was bent up too much and had to be turned down just a tad - the foot of the G# limits its downward travel, so if the B tab or felt is too high, the B key is also stopped before fully closing the pad.
The table key assembly (Selmer-type) simply has to be carefully set and anytime you change something, it affects the other keys. I hate bending those tabs because too much bending will cause them to break off.
Trying to fix the second problem with simply trimming the material on the foot of the G# will work, but this usually lets that key have more travel than it takes to fully open the G#. Not a great problem but in my view just creating a sloppy key instead of fixing it right.
Both of these things are common and can be found on new or freshly overhauled saxes.
The second was the B closed with the Bb key but not with it's own key. Here, the B tab of the G# key was bent up too much and had to be turned down just a tad - the foot of the G# limits its downward travel, so if the B tab or felt is too high, the B key is also stopped before fully closing the pad.
The table key assembly (Selmer-type) simply has to be carefully set and anytime you change something, it affects the other keys. I hate bending those tabs because too much bending will cause them to break off.
Trying to fix the second problem with simply trimming the material on the foot of the G# will work, but this usually lets that key have more travel than it takes to fully open the G#. Not a great problem but in my view just creating a sloppy key instead of fixing it right.
Both of these things are common and can be found on new or freshly overhauled saxes.