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@s.walrus
If you are not completely set on acetylene, you could try one of these:
http://www.thewelderswarehouse.com/Welding/Evolution-LD.html
I've built a couple of frames with just propane (bullfinch autobraze) and silver, but used the above for brass fillet brazing on my most recent. You can buy oxygen cheaper through other companies, if you don't want the refill costs (although you own the cylinder, most companies will only refill cylinders that they have sold). The 1l fuel gas is a propylene mix, but seems to burn very nicely and lasts okay, you can get replacements for about £13.
Looking forward to seeing this develop! I was planning another frame this summer but seem to have run out of money, so will have to take an unhealthy interest in yours instead.
(Some photos of my efforts here: http://www.flickr.com/photos/33937019@N07/sets/)