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I agree with you that basic designs have not really changed all that much since the 60's. Most of what has passed as major improvement is related to things like the number of ports needed and changes in industry standards.Nemrod:Most all of the regulators on the market today are conventional downstream secondstages with the "pie pan" design running off a diaphram first stage. yeah, some are pressure balanced or over balanced and blah blah but really they perform little different from a 1966 Calypso other than having much larger exhaust valves. Exhaust was found to be critical very early in reducing fatigue--other than the substitution of plastic for metal in modern regulators how are they more muscular than say a Voit MR12II from the early 70s or late 60s? How do they perform compared to a Tekna 2100 from 1978 or the follow on composite version the 2100B?
Plenty of plastic SPG's around too nowdays.Nemrod:DA, yes, sitting here watching the "Ten Most dangerous Sharks"--lol!!!! Hey, about those plastic cases, yep, I think it is all cost related and mass production. There is no real advantage other than cheapness. If quality and longevity were important the second stages would be constructed of stainless steel or titanium or good old chrome plated brass. All these plastic jobs crack and are long term unstable. I have stored them away to come back later and find them cracked where o-rings applied constant pressure! I have used some of these well known plastic jobs and I just don't see them still being useable 35 years down the road. I am still diving several Voit MR12II units from the early 70s that perform excellent and are extremely rugged and durable and all metal. I have a metal body Tekna 2100 that just is today as good as the day I bought it in I think 78. Yes, metal can dent but it does not crack so much and dents can be repaired and chrome can be replated after years of use--if desired--or not--I sorta like battle scars! Plastic is not so bad but for the cost of some of these "muscle regulators" shoudn't they be made from something other than recycled milk cartons at least as an option? If the SPG should be made from brass---maybe the regulator ought to be also huh? N