...I think V3 is meant to be better but I wouldn't get them now, there are as good modern tube amps for less for what they go for on eBay. I would at least get one with a Balance out for convenience.
Super interesting, thank you.
I'm not in the market for them, but I did a bit of research and it seems Musical Fidelity were planning a 2025 re-release of a new X-Tube Buffer as a remake of their D-10 tube buffer, but pulled it after some complaints of buzzing/noise. Which I thought was quite interesting. I'm not sure if it did arrive to market.
Apart from what you mentioned it seems the volume wheel of the V2 is often picked up as being fiddly to use. But there are some comments around people preferring the V2 over the later version. They do come up on eBay and it seems go for £80 to £180 depending on parts, tubes included and other other upgrades etc.
From what I gather I'm not sure it's best chasing for HD 6x0 sound, or at least the Bottlehead Crack seems to be mentioned more, but I would imagine they would play very nice with the DT 880 600ohm.

