I changed the lead pipe on my B&H ( I installed a 981 pipe) and love it. I have a newer one I guess with the large bell and the sound just opened up dramatically especially in the low register.
ken k
B&H imperial E flat tuba
Mirafone 187 BBb
1919 Pan American BBb Helicon
1924 Buescher BBb tuba (Dr. Suessaphone)
2009 Mazda Miata
1996 Honda Pacific Coast PC800