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I've tried SilverFlo 30 recently - works fine with a propane torch and is cheaper due to the lower silver content.
One thing that does help when brazing is to reduce heat loss: I made various shapes using fireclay and assorted tins that can be placed around a joint. Commercially made fire bricks would also work, but I had half a tub of KOS to hand and I'm a skinflint.
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MrE
BONUS PART THREE - brazing a front rack
Inspired by the home-made racks of Hulsroy and M_V, I have decided to build a rack. This was also intended to save me some money vs. the hens' teeth Soma Porteur option but it's probably going to cost more with everything factored in.
I've done my research, and with some help from Hulsroy and some of the nice blokes at Herne Hill Makerspace I've got a plan.
10mm mild steel tube with 1mm walls in a grid like this:
Then bosh some stays on!
Easy.
I'm using MAPP gas and a lot of the advice on that comes form US sites, so getting exact info on what (UK available) brazing rods to use is tricky, but I think I'm settling on Silver-Flo 55.
Alex Wetmore's blog is a really good source of rack brazing tips, which I've leant on heavily. I shall order the tubing tomorrow.