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Post by nikeajax on Jul 24, 2014 9:23:33 GMT -8
I just won a Voit-MR12, hybrid I think, on eBait: I've read where it was the first single hose regulator adopted by the US Navy: so what of the Waterlung Navy-Unit? I've also heard that they are outstanding regs so long as you don't try to use them in extra-cold water, as they are prone to freezing, and then free-flow--YIKES! I say it's a hybrid because it has a Titan-II second stage, yet the only Titan-II images I've seen look like a lot like the Dacor Olympic: Come to think of it, the MR12 first stage looks an awful lot like a Navy-Unit, sans J-valve: what gives, eh? I'm guessing the T2 has a much larger exhaust, so I'm not complaining. I also found an original MR12 second stage that I'll be using as an octo, which also has a very good label: this is a rare find so I've heard... More info please... Jaybird
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Post by sitkadiver on Jul 24, 2014 12:58:55 GMT -8
Very, Very, Very nice find Jay. If memory serves me correctly, that Titan II MR-12 was a somewhat short lived version of the MR-12. I would love to find one of those, but alas, they are not very common. I have two MR-12's. One looks like yours and one with the Swimaster bull's eye. I cannot say they have been in ice, but I've dove both regs in mid 40 degree water here in Alaska and they performed flawlessly. So, I'm not sure where the cold water rumor got started. Greg Barlow is the go to guy for these regs. This thread is old, but it would have any information you may need. www.scubaboard.com/forums/regulators/41788-amf-voit-swimaster-titan-ii-mr12.htmlSpeaking of cold water... I use an MR-12 first stage for my work regulator, which is an AGA mask. Here you can see what happens when it's left outside in Alaska springtime weather. Still breathed fine though....
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Post by sitkadiver on Jul 24, 2014 13:07:01 GMT -8
Jay, looking at your first stage, I'm wondering what it is? Is it a waterlung? My Titan looked like a Trieste and had a plug where the 2nd stage should have been.
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Post by rhwestfall on Jul 24, 2014 13:41:46 GMT -8
have the same first paired with a MR-12 II second, gifted to me a few days ago (AMF red/white/blue purge button). Trying to find a new face plate as the one I have is dented... Appears to be a common first stage with this model over many editions...
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Post by nikeajax on Jul 24, 2014 14:13:20 GMT -8
Dave, I was really hoping to hear from you on this thread I think you may have the T2 first stage, very cool! Here's an image I found with the first stage as mine: I believe our friend John was talkin' 'bout the icing, and that's why the USN and other military branches stuck with the Aqua Master for so long, as DH's so I've heard, don't have that critical icing problem... Jaybird
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Post by nikeajax on Jul 24, 2014 14:21:17 GMT -8
Huh-ayyyy, wait a minuuuut! Wherre's the derned purge valve on this thing? Is it the label? Jaybird
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Post by SeaRat on Jul 24, 2014 14:26:26 GMT -8
Jaybird, the MR-12 first stage is a classic, and a great first stage. The MR-12 second stage (in your first photo) is also a great first stage. If you'll look at the MR-12II second stage (the one you have pictured above this post, with the red, white and blue bullseyes, it has a small tube that goes from the LP valve area to the mouthpiece. This tube provided a vortex venturi, which AMF Voit touted as better than the venturi of other regulators. But what happened is that any moisture in the mouthpiece got very, very cold from this venturi flow going through this tube, and it is this second stage that was prone to freeze-up due to icing.
I'll have to look, but I don't think the Sportsways Navy Unit was ever "Navy Approved" by the U.S. Navy Experimental Diving Unit. The one you have pictured is a tilt valve, and I don't think any of those made it through the EDU's approval process.
We used the MR-12 in the USAF, and also the U.S. Divers Company Calypso (when it was a balanced diaphragm first stage); the latter was not U.S. Navy EDU approved, but we had special needs (like parascuba), so we bought them anyway.
John
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Post by sitkadiver on Jul 24, 2014 14:28:56 GMT -8
Dave, I was really hoping to hear from you on this thread I think you may have the T2 first stage, very cool! Here's an image I found with the first stage as mine: I believe our friend John was talkin' 'bout the icing, and that's why the USN and other military branches stuck with the Aqua Master for so long, as DH's so I've heard, don't have that critical icing problem... Jaybird Yup, I have one just like that, w/ 3 lp ports... It's a very nice breathing reg, one of my favorites. you will get many years of diving out of these regs. As far as the Titan II first stage.... I gave it away several months ago. I was planning to use it on an FX project and things didn't go the way I had hopes, so I had an Aqua Master body milled down and used it instead.
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Post by nikeajax on Jul 24, 2014 16:58:58 GMT -8
What is this reg rated for? Is it a high pressure, that being 3000-psi?
Thanks, Jaybird
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Post by SeaRat on Jul 24, 2014 17:47:49 GMT -8
Yes, the MR-12 is rated for 3000 psig. Most regs with solid yolks are so rated, with the exception of the Sportsways Navy unit you have shown above--that one probably won't support 3000 psig, not because of the solid yolk, but because of the screw threads.
John
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Post by herman on Jul 25, 2014 3:15:18 GMT -8
The Titan II first looks a lot like the Dacor 400, so you def have a first gen MR-12 first stage. Voit/AMF used that second on a number of regs so no telling how the T-II second got on the MR-12 first. In any case, USD Conshelf/RAM/damn near every USD/AL reg HP seat will work in the first stage but you may have to replace the pin depending on if the reg was updated or not. Older models used a different pin length and were change out during service later in it's life, no telling if this one was updated. The balance chamber oring is a pain to replace but it can be done - same goes for the T-II. The second stage, reguardless of which model it's labeled as, is a nice little reg. Set up correctly, it breaths nicely. The current Mares Abyss diaphgram is a drop in replacement for the original. The exhaust valve and LP seat are common sizes so they are no problem to get. I use that second stage as my pool reg when DMing OW classes...on a 3rd gen MR-12 first come to think of it.
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Post by nikeajax on Jul 25, 2014 7:21:19 GMT -8
Herman, excellent, thank you: I was hoping you'd chime in, as I'd read some of your other postings on the the VHD site.
"Older models used a different pin length and were change out during service later in it's life, no telling if this one was updated."
Is this the primary-push-rod? Is the updated one longer, and can you please tell me what the advantage is?
"The balance chamber oring is a pain to replace but it can be done - same goes for the T-II."
I'm guessing it's harder than the Conshelf's then?
Thanks again, Jaybird
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Post by nikeajax on Jul 25, 2014 8:12:39 GMT -8
Actuator-pin--yes?
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Post by herman on Jul 25, 2014 9:44:11 GMT -8
Yes the pin (#12) between the mushroom(button -#13) and the HP seat...seems like it was shorter but don't hold me to that. All the ones I have have the updated pin in them. Oh yea, the USD one is easy comparied to the AMF.. it was intended to be replaced as a unit as opposed to replacing the oring itself. The exploaded view shows all the parts seperately but the parts list indicates it is an assmebly only. The end washer is crimped into place so removing it is not an option. There is a complete Voit/AMF parts list on VDH you can download to see the exploaded view. I have no clue what the advantage is/was but my GUESS is, it was so they could use USD HP seats. With the correct pin length, you can use AL/USD or Mares seats in the reg. Somewhere I seem to recall that USD changed the pin length(and depth of hold in the HP seat) at one point which may be the reason for the change.
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Post by nikeajax on Jul 25, 2014 11:08:57 GMT -8
Herman, thanks for the heads up on the data-sheet...
Was looking it over quite briefly, and noticed the maximum depth is 200, and with the helium-oxygen mixture it's 600-feet. I was told no one uses heliox: I remember watching ol' JYC as a kid and one episode they were using heliox. Albert Falco musta had his hands full being the cameraman, at least I think he was, as I only saw it once, when it came out, what, 40+ years ago, and me perhaps five or six... very exciting stuff, that still holds up today!
Jaybird
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