With very few exceptions, what you see on eBay is mostly crap. It's a video dumping ground more than not.
- Many sellers lie; sometimes knowingly, sometimes not.
- Many buyers are newbies, suckers, also don't know what they're buying, until it's too late.
Almost all of that stuff comes from estate sales, warehouse/storage auctions, etc. It's been kept in horrible conditions. I recently acquired something, for TBC research, that smelled like a mushroom farted. The smell will saturate a room worse than cigarettes.
You must be careful.
All of that stuff linked to is cast-off garbage, no real use. Not to broadcasters or studios. Not to anybody conveting consumer analog tapes.
At best, that Miranda card may be useful for TBC R&D. The others should probably be recycled for precious metals.
The prices are laughably ridiculous.