Thanks Doug. It's good to know the heat can stay local enough to each joint location. In my normal work, I'm brazing with anything from a rosebud to a #1 and hardly think about it, but a bicycle frame is like a musical instrument, and I'm a bit apprehensive about getting things as right as I can. Regarding Reynolds 753, I was under the assumption that some amount of cold setting was part of the deal. Are you saying that when using heat treated tubing one has to nail the alignment all through the process? I'm planning on using 531 for my first frame, by the way, as it seems like a more forgiving alloy for a beginner. That's a funny story about the Americans failing the test. The Brits are top notch craftsmen, and there's not a very strong master/apprentice relationship here. But we are good at banging things out, or we used to be, anyway.