Ribbon mics : DIY or purchase ?

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My memory is not as good as it was, I think I've posted this here but I'm not sure.
If you would like to listen these mics used in recordings here are some examples:

I recorded the Piano on these songs with a spaced pair of TBone RB500, I also recorded a pair of Neumann U67, but Júlio the pianist choose only the RB500 in the final mix, so the U67 tracks were not used in the mix:






In this record from Cristina Branco called "Mãe",
the Piano sound is a mix from the pair of U67 and the pair of RB500, volume relation between the too would change depending on the song.
The Portuguese Guitar was recorded with a pair of Schoeps CMC5 close and a Tbone RM700 further away to give some space (distance and Fig8) and also some body (because it's much darker and has more low mids than the Schoeps), volume relation between the schoeps and RM700 would change depending on the song:

 

[jeremynothman]

RB500 is a pretty good mic on horns! I've also use my cheap TNC ribbons (royer style) on horns, piano and electric guitar. You have to watch out more that the player stays on axis than that the mic does a good job (and because of that, sometimes the combination of a cardioid SDC with a big ribbon is not a bad combo at all).
Sure, neither is an RCA or Melodium (better on vocals), a 4038 (better on overheads or cello), nor a real 121 (better on electric guitar), but both do just fine for 100euros.

If I didn't have these ribbons, I'd probably consider NoHypes or Bumblebeez, which both have the advantage of looking good.

 

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[ElSmurf]

Found some comparison videos for the RB770. I really like how it makes the lows and low mids sing. Sounds very musical to my ears.