109 Second Stage on MK10 or MK5?

[ozziworld]

I have just acquired a 109 Adjustable/MK5 set with 2 second stages and wanted to get some opinions.

I also have a G250Graphite/MK10 set that I have been using for the last 20 years. I was considering pairing one of the 109s with the MK10 so as to end up with one set 109/MK10 and one set 109/MK5 and just keep the G250 Graphite for trips where a little weight advantage might be worth the swap.

I basically want to use the brass 109s and was thinking it might perform better with the MK10. If it performs just as well with the MK5, I guess I can just leave the G250 Graphite on the MK10.

You opinions would be highly appreciated.

 

[rhwestfall]

Been diving MK-10/109 (or 156) all my certified years. Outstanding combination.

 

[Zung]

Tough.

Basically, I've the same problem: deciding between the 109/156BA and the G250. While the G250 breathes a bit better thanks to the Venturi assistance, the 109/156 has a much better "cool" factor. The 1st stages don't do much to the perceived performance, as long as they're balanced and properly maintained.

So my advise is: keep both your G250/MK10 and your 109/MK5 as is, and alternate between dives or between trips until you make up your mind. I've been doing this for the last few years and can't say which one I prefer. Just make sure to tune them both to the same cracking pressure, usually around 2.5 cm or 1 inch of water, so you compare apple to apple.

Note that you don't really have to decide, since you have both: just dive with whatever you fancy at the moment.

 

[rhwestfall]

its all about the "Cool Factor"

 

[Fishpie]

Have to agree with the others.
Since the perception of performance has all to do with the 2nd stage and there's minimal difference between the 5 and 10 I very much doubt you'll be able to tell any difference between having the 109's on the 5 or the 10.

 

[AfterDark]

When I dive my ID's one reg in a Mk10/R109 the other is a Mk5/109. There is no difference I can perceive. Nice score!

 

[elan]

Is it really a vintage question ?

 

[Zung]

Is it really a vintage question ?

Good point. I had to check, and, to my great surprise, the definition is: "Pre-1980 "Vintage" SCUBA Gear".
So even the G250 is near-vintage.
Time flies... :depressed:

 

[AfterDark]

Good point. I had to check, and, to my great surprise, the definition is: "Pre-1980 "Vintage" SCUBA Gear".
So even the G250 is near-vintage.
Time flies... :depressed:

These reg are timeless. They are the standard.

 

[elan]

These reg are timeless. They are the standard.

Shhhh... No need to tell everyone do not increase the demand...