On my clarinet i added a gz34 and it increased bass.I only use gz34's now.
I am in the future buying a mullard.
Will it make a difference in your chime?I don't know but i have never read a bad thing about that tube.
If it's too expensive mullard set up a factory in japan years ago.Those tubes from that factory are supposed to sound as good but for less.Sorry don't know the name,Maybe someone else does.