Most of the conjecture here is that an increase of listeners rotating out of tubes and into solid state is because of Issues with Tube Availability from Russia going forward. And that might be the final straw for many tube owners. But the reality is that many of them have heard truly high end Class-D (Hypex/Purifi) and then realized how cool it runs and how much less power it consumes and are sold. Whatever the issues are with solid state that tube aficionados seem to detest, they seem to be missing from these high end Class D offerings. Hell, when Atmo-Sphere announces a shift away from tubes, that would be the fat lady singing IMO.