Even the smallest tip I had for my giant torch was bigger than the tips I use today. Fortunately, back then I could rent large tanks, because I would have been flowing too much acetylene to be safe with the tanks I have now.

I think trying to learn to copy Paul Brodie's technique may not be that great of an idea. He's obviously a master. I have been brazing on bike frames since the '70s and I don't think I could copy him. I'm not sure how the gasfluxer affects his technique. It makes it difficult for me to judge what's going on. Someone that is experienced at brazing can tell when the temperature is going up too fast and they do something about it. There is a light color of pink that is about as hot as you want to get the steel when you are using silver. Light red is okay, but it's too hot and you want to avoid it.