EDIT: I have a few interested buyers. Let me work through y'all in the order you contacted me. I'll bump this post if I'm searching for buyers again.

Pictures: <IMGUR id="a/zPXN3Gt">https://imgur.com/a/zPXN3Gt</IMGUR>

I have a used Bach 42 that I picked up locally a few months back before discovering all its problems. It makes a sound, but the slide is not in good enough condition to play well and the resonance is not great. Serial number is 83866, which puts it in the late 80s.

Here are the problems:

• The outer slide has a few cracks at the bottom, which are from red rot.
• There's a dent in the outer slide that prevents the slide from moving freely. However, my local brass tech won't remove the dent because the red rot means that attempting to remove it might make a hole in the slide. The outer slide is probably not recoverable.
• The bell has been re-worked a few times. I suspect that this is causing the resonance to suffer (I compared with a Conn 88-H, and I could hear the difference). I've heard much worse, but it's not anywhere near the standard of a professional-level trombone.
• The lacquer is pretty shot all over.
• The F attachment rotor has a leak; I know because it doesn't make the "clunk" sound when released and you can feel a slight drop in pressure with the F attachment engaged. As far as I know, this is fixable.
• The case is very beat-up from the outside with lots of exposed wood. The inside mouthpiece compartment cover is a little wiggly. I don't know whether it's a Bach case, but it fits.
• There is an aftermarket brace under the F attachment rotor.

Here's what's good about it:

• The inner slide is in good condition. Not entirely straight - maybe 7/10 - but before I put a dent in the outer slide, it was easy to play.
• The case is in good functional shape. The latches and hinges are secure, the padding is not too worn, and it fits the horn correctly.
• The sound is open and loud.
• The tuning is fairly good, from what I can hear.
• The tuning slides have no dents. If you run your finger over them, they're slightly misshapen. They'd probably need a chemical bath move really freely though.
• Not any significant dents aside from what I already mentioned.

If you replace the outer slide and fix the rotor, this could be a good beater horn.

$200. Open to offers for individual parts as well.

How bad is the bell?

That's a nickel slide right?... Nickel can't get red rot... red rot happens from zinc leaking from brass... there's no zinc in nickel...

Either way, there happens to be cracks in the outers due to thin spots in the slide. Easy enough fix with a patch or replacing the outers.

Re: the bell, there's a little cut (2mm?) in one side of the bell, it's a little warped / note quite flush when looking from the side, and if you run your hand along it, you'll notice some unevenness in the texture (little ridges, etc.). Take a look at the pictures and ask for more if it''s not clear.

Re: the slide, yeah I'm pretty sure it's the lightweight nickel slide. A local brass instrument repair specialist looked at it for a few minutes and told me that the cracks at the bottom were from red rot; if that can't happen to nickel, I'm not sure what exactly is going on. When I bought it a few months ago, there was electrical tape over the cracks, so the cracks themselves are not an immediate problem; however, there's a dent in the slide that may not be fixable if the corrosion (red rot or something else) has traveled throughout the entire outer slide. And like you said, you can always just replace the outer slide.

Pm sent.

Sent email. Lmk! Thanks