I don't recommend my brazing page anymore. I probably should delete it. However the method described there may be appropriate for MAPP gas. I was working on a new version, but now I don't have time to finish it.

I now use a big, hot neutral flame, and get almost as close as if I were welding. I control the heat my turning the flame completely off the joint while things cool. The result is more control and almost no charring of flux. I've also learned not to flux the rod, just a thin coat on the tubes.

I gave a couple of classes last year to MnHPVA members. After a couple of hours of "Chalk Talk" I had them practice on "V" joints. These allowed them to practice without the complexity of working their way around a joint. http://bikesmithdesign.com/brazing/test1.jpg
http://bikesmithdesign.com/brazing/test2.jpg

After a few of the test pieces and watching me do a joint, a fellow who had never held a lit torch before did the joint on the left in http://bikesmithdesign.com/brazing/Samples.jpg My joint is on the right.
Mark Stonich