SP - A vs R vs S vs G?

[OMyMyOHellYes]

I am getting very confused discussing SP 2nds.

I am kinda coming back around to appreciating AA. Make one second stage. Period. That doesn't confuse me. (well, maybe two, but pretty much the same design, just some different materials - I understand that Ti, like Mg and Na, might not behave well around high concentrations of O2)

OMMOHY

 

[lexvil]

There is only one good one and you’ve left that letter out.

 

[James79]

There is only one good one and you’ve left that letter out.

I still feel the best ones don't have a letter designator (108/109/156)! But I do love some chrome, lol.

Respectfully,

James

 

[lexvil]

I still feel the best ones don't have a letter designator (108/109/156)! But I do love some chrome, lol.

Respectfully,

James

Those are ok but…

 

[OMyMyOHellYes]

I still feel the best ones don't have a letter designator (108/109/156)! But I do love some chrome, lol.

Respectfully,

James

I admit I don't know all the letters or what they stand for. That's the question....

OMMOHY

 

[scubadada]

Like @OMyMyOHellYes I would love to see a brief discussion of Scubapro A, C, D, G, R, and S 2nd stage regulators from some of the SB regulator gurus.

Thanks

 

[James79]

I'm no guru, but what I had heard is that the letter designator reflects which engineer designed it. But that's just a half remembered "I think I heard." I will note that it looks to me like it doesn't matter from an operator level, because I haven't seen any number designators repeated with different prefixes. Rendering it mostly something for us to get pedantic about!

Respectfully,

James

 

[lexvil]

It’s really not worth trying to make any conclusions based on the letter, they are mostly meaningless. The D is my preference followed by the G260 and S as in s600/620. The ”G” doesn’t mean much the G250 is a solid reg which is a plastic 109 in effect but also there is the G250 hp which is a melding of the G and S (by the way once the more modern # type adjuster is added it’s a fine reg.) the G500 is the beginning of the s type but with the not so good adjuster and a tiny asperator hole. Don’t forget the “C” …

just pick a size you like

 

[OMyMyOHellYes]

At a very basic level, I think I und3rstood that R was a downstream valve design and that S was a balanced design, but I'm likely wrong.... But would like to know!

 

[lexvil]

At a very basic level, I think I und3rstood that R was a downstream valve design and that S was a balanced design, but I'm likely wrong.... But would like to know!

Sort of and more often the case than not.