When the site first went online we published Jetphase's great series of articles on funky and uncommon recording gear. I also call it the black box series.
http://www.mojopie.com/blackbox.html
My first foray into forgotten recording gear was the purchase of an Electro Voice 635a. Jetphase said of the mic: Eletro-Voice Model 635A: Here's a mic that used to be quite popular, but seems to have been forgotten over the years. Use it anywhere you'd normally use a Shure SM-57.The thing that makes the 635A interesting is that it's an omni-directional dynamic mic, so it really doesn't exhibit the proximity effect that most cardoid mics have. I like them on guitar amps, and even on the snare drum.
I forget who said it but the 635a has a certain "Exile on Main Street" sort of sound.
I then acquired a Beyerdynamic Soundstar MKII. Jesus, Mary and Joseph this is a mic. I paid around $30 for mine. I shudder when I see the asking prices for these anymore on eBay. It's a lot, lot more.
We've also created the cult of the DBX 242 here at Mojo Pie.
I am an old gear addict. First, the quality is fairly high. And, second, there are still bargains here and there that make this gear worth owning.
So, let us now come together and admit our addiction to old gear.