I wasn't so concerned with compatibility as with "flavour". I remember reading somewhere that they had come across a huge stock of particular NOS tube, enough to supply them for Vali 2s forever. Just wanted to know if the the tube I got is the same as people have been receiving with their Valis. I guess like this one? Mine definitely has a different internal construction. So it seems I don't have the same tube. I originally bought it to try with the MCTH, but was advised that it isn't fully compatible. But for someone who wanted a replacement for the original tube that came with their Vali 2, it could be a bit of a disappointment.