Bore + bell of 5/4 Bb tubas?
Posted: Fri Oct 23, 2026 3:37 pm
There is something that puzzles me: I am in the search for a decent, used 5/4 Bb tuba, preferably with 5 valves.
I had the chance to try a B&S B&S 3098/PT-6 CC tuba, and liked it much, this is pretty much what I'd like to find, just in BB.
The reason I'd prefer a BB tuba over a CC is that my other one is an MW Eb tuba, and I have a 4/4 B&S CC tuba ( 19-20-21 mm bore and 40 cm bell ) and another B&S 4/4 BB tuba (19 mm bore on all 4 valves and 42 cm bell).
While I have learned both fingerings, I think a BB complements the Eb better than the CC.
I really like the bore, bell and feel of the PT-6, it's probably due to 'conical' valve section 19-20-21 mm and the 48 cm bell. And of course, the taper inbetween ..
What really puzzles me is the very odd bore and bell sizes can find in used BB instruments: I can typically find on the used DK market
4/4 BB tubas like B&S , typically 19 mm bore (maybe the 4th valve 20 mm), often only 42 cm bells, sometimes 45 cm bells
4/4 BB tubas like the Cerveny CBB 681 with 20,2 mm bore and 40 cm bell (I had one of these, and the low range was not good ...)
6/4 Kaiser BB typically with bore 21 mm on all valves, an bells from 45 to 50 cm
The funny in-betweens with 19 mm bore and 48 cm bells, or 21 mm bore and 42 cm bells I also have seen.
But nothing resembling the nice conical valve section, throat and bell section of a PT-6. Why are BB tubas - at least those on the used market - having such odd sizes, and feels compared to the PT-6 ??
What make and model should I look for to find a 'true' 5/4 BB with nice punch and good response??
I had the chance to try a B&S B&S 3098/PT-6 CC tuba, and liked it much, this is pretty much what I'd like to find, just in BB.
The reason I'd prefer a BB tuba over a CC is that my other one is an MW Eb tuba, and I have a 4/4 B&S CC tuba ( 19-20-21 mm bore and 40 cm bell ) and another B&S 4/4 BB tuba (19 mm bore on all 4 valves and 42 cm bell).
While I have learned both fingerings, I think a BB complements the Eb better than the CC.
I really like the bore, bell and feel of the PT-6, it's probably due to 'conical' valve section 19-20-21 mm and the 48 cm bell. And of course, the taper inbetween ..
What really puzzles me is the very odd bore and bell sizes can find in used BB instruments: I can typically find on the used DK market
4/4 BB tubas like B&S , typically 19 mm bore (maybe the 4th valve 20 mm), often only 42 cm bells, sometimes 45 cm bells
4/4 BB tubas like the Cerveny CBB 681 with 20,2 mm bore and 40 cm bell (I had one of these, and the low range was not good ...)
6/4 Kaiser BB typically with bore 21 mm on all valves, an bells from 45 to 50 cm
The funny in-betweens with 19 mm bore and 48 cm bells, or 21 mm bore and 42 cm bells I also have seen.
But nothing resembling the nice conical valve section, throat and bell section of a PT-6. Why are BB tubas - at least those on the used market - having such odd sizes, and feels compared to the PT-6 ??
What make and model should I look for to find a 'true' 5/4 BB with nice punch and good response??