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Before you go to too much trouble, try another horn and another mouthpiece first to make sure that its not one of them that's causing the problem for you!

I used to have the same problem, dont freak out, im beginning to adjust pretty well in just a few weeks. Just a matter of really listening to the pitch. dont think, o higher Bb LIP DOWN like crazy! because then you WILL have to lip it down a lot. just hear the pitch , do some buzzing. You can think of playing it on the lower side but you probably do want to check the horn because I know those really odd ones are hard to deal with. My partial with the F#, Gb, G, Ab, A and B at the bottom of the staff are EXTREEEEEMEEEEEEEEELY flat and I dont know what to do about it, its almost impossible to lip.............................so ur not the only one.

Good luck

ps yes i do understand the B is in a diff partial, but my 2,4 (on euphonium is REALLY flat and my 123 is really sharp of course)

i had a similar problem and found that i wasn't using near enough resistance in the lips while phaying low notes. Think about having a smaller hole in the lips as you go lower, that helped me at least. good luck!

When I first started back into it, I wasn't relaxing my jaw and throat properly, so low BBb and below were sharp until I sorted that out. Now everything is fine.

Hmmm, I have this problem with the 5th on 2 different horns, one very sharp and one very flat

use your ears. they can help alot.

remember-relaxing the lips means you will go flatter, tensing them means sharper, you're probably just tensing up too much on the Bb in the staff, or too loose in the one down low, so basically, lipping and listening....