Maybe #vintageaudio. It's a bit of a niche in any discussion, but I enjoy seeing pictures and sharing stories of what other people have collected. Unless they make me feel old by asking "made in 1994, that's vintage, right?" Here's part of mine, a McIntosh MC30 from the early 1960s. 
My guess is that kleinbl00 and ghostoffuffle could help contribute to this tag. I don't have any vintage gear, myself. Though, my acoustic guitar would likely be considered vintage at this point. It's a 1978 Gibson J50. I love it. But no audio/recording gear to speak of. Kleinbl00 would call my MBOX vintage, I'm sure.
I would call your mBox old. There's an implication in "vintage" that it has merit. I don't think I have anything that would qualify as "vintage" as I pretty mercilessly update. I finally let go of my H3000D/SE, which people on eBay describe as "vintage", once Eventide's H3000 Factory had enough of the algorithms to make it too much of a hassle to go through the hardware. I still miss some of the algorithms, which they keep telling me we'll be beta-testing soon. The oldest pieces of gear I have don't make sound, and are owned because they dust the shit out of anything modern for anywhere near the price. I have a Roland A-80, the biggest, scariest, nastiest, heaviest weighted 88-key controller ever made, which has polyphonic aftertouch (and which I've modded so that you don't have to break a finger to make it work). That, combined with the Arturia CS-80V, is a treat and a half. And I have a DK MSD600M, but that's only because a 600Mplusplus (one of these days we must fix the markup) is about a $6k meter while my MSD600M was $350 on eBay. Yes, I'm still proud of that score.
...wow. What a beauty. It works on the lamp technology, even! That's amazing! Do you have any more photographs? I might suggest using #vintage or #retro (whichever is appropriate, if any) to start with. I'd love to see such things alive and kicking.
If you'll pardon the mess, here's a picture from a few years ago from further back. My speakers and turntable are modern, but the amplifiers are a pair of MC30s, and in the middle is a McIntosh MX110 from the mid 1960s. The MX110 is a tuner/stereo preamp. In the world of vintage McIntosh tube gear, the MX110 is a steal. It's a fun hobby. It isn't the most practical at times, but that's what makes it a hobby. I have a few other pieces lying around, but the McIntosh stuff is my favorite.
Very nice. Is that a Rega Planar 2? I used to have one of those and absolutely loved it. Put a Grado cartridge on it and ran those through a Mission Cyrus amp on the way to PSB 500 speakers.
It's a Music Hall MMF-5. The cartridge is a Goldring something. For the money, I've been really happy with it. My speakers are Paradigm Monitor 7s. It all suits me fine and is very decent. My speakers are probably the weak point, but for now I'm happy with everything. I probably need to buy a house before buying new speakers.
I hear you. When I moved into a condo I had to store those PSBs. At something like 50 lbs each they needed a lot of room and air to push around. That looks just like the Rega except I now notice it has a double plinth and so is probably much heavier. I always bolted mine to a solid wall.