i have been playing on a selmer mark (i think!) for a couple of weeks now. my teacher recommened it for me, but it seems to be screeching on most notes, and when i play quitetly i find it hard to get out low f's for example without having it go up the octave.
iv only ever played on a yamaha or yani, this is my first vintage. could it be me playing it weirdly, or leaks or something?
it is also possible that the left palm keys on some older horns are set much higher and you could be all so slightly be touching one of them creating the screech also. if that doesn't help test for leaks