Echoing a few, the fact you're the original owner and it's served you so well, you've got the permission from the RB Gods to give it some proper TLC: new tube, new paint, the lot
It's Max OR which is Nivachome Steel. I've never had anyone suggest it can't be welded and I've already been quoted for a replacement seattube, but I guess it might be different to weld an existing in situ tube as a repair - I can't answer that yet.One other question is what it's made from. 531 and 753 cannot be welded as they are Mn-Mo not Cr-Mo. That's probably why you have to let in a new tube.
I think this is a head v. heart sort of decision. Head would say new frame, heart says repair. Neither is wrong!
I tell ya, that's quite a coo isn't it. I thought you'd all be horrified at the idea.Echoing a few, the fact you're the original owner and it's served you so well, you've got the permission from the RB Gods to give it some proper TLC: new tube, new paint, the lot
Nivachrom isn't CroMo either https://www.framebuilding.com/Tubing Materials.htmIt's Max OR which is Nivachome Steel. I've never had anyone suggest it can't be welded and I've already been quoted for a replacement seattube, but I guess it might be different to weld an existing in situ tube as a repair - I can't answer that yet.