Having borrowed a Behringer B-5 for some vocal recordings, I was impressed with how good it sounded.
I decided to give a C-1 a go. I found a NOS one for (I think) £25 and went for it.
When I got it, I was a little concerned that there was a bit of buzz. I didn't have time to properly listen to it though, so left it as it was.
Today I got a proper look at it, and the buzz is loud enough that it's unusable. I wondered if it was an issue with my cables, but swapped them out and no better. I thought that maybe it's just the nature of the mic, but comparing it to similar gain levels from other mics, the noise is very noticeable.
I googled around, and decided to take it apart, make sure everything is grounded properly and that it's nice and clean.
Taking it apart, I noticed spider webs on the inside, and corrosion on the board. Probably not a big problem, but I cleaned that up first with some contact cleaner and a Q-tip.
The case itself is, I'd assume, anodised somethingorother, so there isn't an issue with the finish on that side. But I gave it a clean anyway.