Vintage Double Hose

Hello,

I own a bunch of La Spirotechnique Mistral and Royal Mistral regulators.
I have been diving with one for some years now. I recently started to service some others that where not in working order
to start giving some pool introductions in my diving club. I have 6 now in woking order and noticed something strange.
I tuned them al with the same gauge and they all have the new silicone membrane from this site. There is a difirence in breathing effort
between them. Some go verry well and others are less. What could cause this difference?

regards

tim

First guess: Lever height.

Lever height.....Tension on the diaphragm.

That was my guess to but I used a level gauge so the height should be the same on all of them.

Tim

timbo wrote:That was my guess to but I used a level gauge so the height should be the same on all of them.

Tim

Proper lever height on Mistrals is an art, not a science. I have two mistrals, neither of which work properly at the "gauge measured" height. Took a lot of futzing around to find the sweet spot, and both sweet spots are different on each Mistral. Go figure. Mark

Since we're back on the Royal Mistral topic - Are they worth the effort and headache for the collector who wants to dive and maintain them regularly or is there some design or material flaw that makes this a regulator that oughta be passed on as consideration for purchase? It's not really a good sign that production was discontinued after a short time.

I have an acquaintance that was with US Divers in the 60's and 70's here in LA but he can't remember anything good or bad about them.

I've heard stories and read threads. . .

LaSpirotechniqe Mistrals/ Royal Mistrals are fantastic regulators.
US Divers Royal Mistrals are better looked at than dived.

Two totally different creatures all together though.

Sent from my SM-J700T using Tapatalk

The springs may vary in tension from one reg to another.

I have been thinking the same things.
I wil try some fine tuning and wil see where it goes.
Here in Belgium the oldtimers al dove La spirotechnique mistrals or Royal Mistrals so I think they must been ok.