r/basstrombone

Hello everyone. I currently have an issue. My school owns a Bach 50b2. However, when someone repaired it, they put a 50b valve section on it. Since then, it's been completely unusable due to the fact that the 50b valve section does not fit a 50b2 trombone. I was wondering if there was any dealer or reputable website that sells older-style bach sections? Please reach out and thank you guys so much in advance!

https://preview.redd.it/q1zjzij7t56h1.jpg?width=2160&format=pjpg&auto=webp&s=f4d33eebf7509c9bd7fb30e0c913828fdea9ad06

When i play alone i can clearly hear my sound.
But when i play in my marching band, i cant hear it. Specifically notes until low C going down to pedal. It doesn’t pop out like i heard in the other bass bone player.
Please tell me the secret.
Thank you.

Is there anywhere in the north Eastern Arkansas area where I could potentially try a contrabass trombone in F?