Rob - I’ve been using the G-tec natural gas concentrator for 5 or 6
Prior to that I used ng at residential pressure with a Meco Midget
and ventilated tips. The G-tec booster is fabulous. I have the bottom
of the line of their fine machines. I found it noisy until we
installed it below the soldering bench. It was just the fan, but it
bugged me. Now I have to remember to turn it off.
I tried one of the modified oxygen concentrators and it was a flop -
simply not enough volume to match the wonderful G-tec. I know nothing
about the more recent high volume machines.
Along with the G-tec, look at Paige tools
( http://www.ganoksin.com/gnkurl/paigetools )
for their ventilated tips. They make a world of difference for the
Meco, Hoke and the little torch. Especially working with silver and
Would you please keep us advised on your research into the newer oxy