I’ve said all along that if the tube is microphonic, it might help.
As for ARC dampers melting, etc… I still think either they are aftermarket add ons, or the component is very old, or the component is in a very hot environment.
CR qualifies as a very hot environment. Maybe they all melt in your neck of the woods. I’ve never doubted your story that they’ve melted. I’ve just doubted that they were OEM or not too hot.
I hope the volcano is giving you a rest. I’ve had you on my mind this week.