Vintage Double Hose

How do the old single stage Mistral's breathe in comparison to the double stage regs?

Double stage regs breathe better and usually can be used with 3000 psi
tanks. Single stage regs should only be used with 2400 psi max.
I am sure others will chime in and have better explanations.

My experience in comparing the two is limited to a single stage mistral and my royals. I have dove my royals to depths of 115 feet with tank pressures of 2600 to 0. They breathe the same throughout the spectrum. I have dove my mistal to 70 feet and tank pressures of 2500 to 300. The difference in breathing resistance was so slight that I didn't notice any. My experience was not very scientific but both regs supplied all the air I demanded in all positions in those dives. My only comparison is that the Mistral is much louder than the royal. The inhalation comes via a venturi tube and you definitely hear a "roar" or a loud air escaping sound. Not anything that is disturbing, but definitely noticable. Other than that, I like both of these regs and have a tough time chosing which one to dive.
Allan

My best breathing double hose regulator is a Heinke Mk III. My best breathing Mistral is a Siebe Gorman. My overall best breathing regulator, for volume, is a Porpoise Universal, the first single hose.

All have venturies of one sort or another. Perhaps that is the difference.

Steve

I had my Mistral at 110 feet in Catfish Hole I think it was. The Mistral does not have the ability to accept an octapus or inflator since it has no hookah port. It is louder than the RAM or DA due to the venturi. My Mistral breaths like a charm especially once the tank falls below 2,000 psi. My Mistral breaths better than any of the DAs I have or had or at least equal once the pressure get down a bit. It does not equal my RAMs but I think my Mistral is a good breather and I like the venturi sound, it is a fun regulator to dive. While it is probably best enjoyed a bit shallower I would not hesitate to go to 130 feet with it if needed. But since I have three RAMs with octapus and such why would I--?
James

When I want a lot of noise when diving I use my "mistral" When I want peace and QUIET, I use my BROXTON, or NAVY DA NON APPROVED"