Barracuda on low pressure- my former setup for 2 years

Thought I'd post some pics of my old setup for informative/newbie purposes, since it is not too mainstream. I work Boro. (I now work a PM2D and a G-tec TB-90 Natural gas booster)
I osed to run the Beth Barracuda on 0.4psi(Yes, less than 1/2psi) Natural Gas AND 3 medical O2 concentrators that will push 5L (liters are volume) or about 9psi (15L total volume, obviously 3x5=15).
The flame is softer, certainly not the mega push of a GTT on 20/50psi, but It generates heat nonetheless.
I "Y" in 02 from a K tank for more volume (still only about 9psi) on the upper end for even more heat, and oxidizaation.

With only three concentrators and 0.4 psi nat gas: I could work 1" rod, just a bit slow. Easically make 1" marbles. Leans toward reducing flame. Anything under 10mm and it's just as hot/adequate as anything else I've used.
Hope it's informative.....
Pics display different flames...