I was recienty introduced to an absolutely amazing forge burner. The maker, Stephen Gensheimer is an extremely talented machinist and Blacksmith. He has hundreds of these sold to the Blacksmithing Community which is where I found them. For comparison this burner was run side by side with the T-REX Burner and it outperformed it in every test. Extremely impressive!!
From the Maker:
The burners tend to run a neutral to slightly reducing flame throughout the pressure range and have been used to weld billets for hours at a time. The burner is made from drawn over mandrel tubing rather than common black pipe and is accurately drilled in a milling machine fixture before the interior of both the tubing and the holes are honed. The gas injector in these burners is fixture drilled to create a long smooth gas injection orifice before the rest of the injector body is drilled turned and tapped for the gas line fitting in a turret lathe. The two parts of the burner are tig welded together in a very precise fixture and then each burner is tested for function over a wide range of pressure.