• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

Calypso red label and Conshelf VI

Discussion in 'Vintage Diving & Equipment' started by Voit Blue 50, May 24, 2021.

  1. Voit Blue 50

    Voit Blue 50 Registered

    # of Dives: 500 - 999
    Location: Lunenburg
    13
    5
    1B502523-7B2C-46A8-87A9-9607D305A7BA.jpeg BCB038EC-534F-44B3-A0D0-0329E556638D.jpeg

    I’am planning to open up and service a Calypso red label and a Conshelf VI this summer after I order up the service kits.

    I have never these regs before, does anyone know anything about them, such as year and how they breath?

    thanks
     
  2. ofg-1

    ofg-1 Contributor

    500
    1,238
    Both second stages are the same internally as most USD second stages . Breathing difference, these have a smaller exhaust port. The Conshelf VI is your basic diaphragm regulator, should be able to adjust fine.
     
    John C. Ratliff and Voit Blue 50 like this.
  3. James79

    James79 Reinventor of Wheels ScubaBoard Supporter

    # of Dives: 50 - 99
    Location: Lower Alabama
    1,024
    1,402
    I use a Conshelf VI as my pony reg, and have a red label Calypso as my alternate on a DAAM.... In short, all Conshelfs from the VI through the first generation Titan are the same inside (Parts interchangeable, same rebuild kit). I think they came out in 65?
    The Conshelf and Calypso chrome seconds are all of a type commonly referred to as "1085" (comes from a part number). Over the years there were 3 different exhaust mushroom sizes I'm aware of, and the earlier ones have a screw on exhaust T, where newer ones have a pressed on T. (I've made 3d printed T's for the screw on style. If yours are toast, let me know!).

    I find them to be great breathers, but I tend to be shallower so the smaller exhaust on the early models doesn't bother me. I use the military Conshelf XIV manual for rebuilding all generations of Conshelf.

    Respectfully,

    James
     
  4. Voit Blue 50

    Voit Blue 50 Registered

    # of Dives: 500 - 999
    Location: Lunenburg
    13
    5
    Thanks, I haven't had a chance to open them up yet, summer project.

    I am trying to decide if I want to use one of them with my DAAM like yourself or a 1085

    Thanks,

    Dave
     
    John C. Ratliff likes this.
  5. Pacediver

    Pacediver Contributor

    # of Dives: I just don't log dives
    Location: Nova Scotia
    81
    78
    They look in great shape
     
  6. Pacediver

    Pacediver Contributor

    # of Dives: I just don't log dives
    Location: Nova Scotia
    81
    78
    I just realized who you are when you get setup I’d like to get you to check out some gear if you are interested thanks
     
  7. John C. Ratliff

    John C. Ratliff Instructor, Scuba

    # of Dives: I'm a Fish!
    Location: Beaverton, Oregon
    3,054
    1,782
    Yes, do use it on your DAAM. It breaths great for inhalation, and pretty well for exhalation. It passed the U.S. Navy Experimental Diving Unit's evaluation for use. The EDU made recommendations for increasing the size of the exhalation mushroom valve, and later for putting the whole valve in an air bubble, and so U.S. Divers complied and made the later second stages outstanding breathing machines. If you look at the "Figure 13C-2," you'll see the EDU's evaluation of the Conshelf XIV, which is basically the same regulator for the inhalation side, as the Conshelf VI. The "Breathing Work vs. Depth" curves will be slightly different from this diagram for the Conshelf VI, due to the exhaust size. But it will still be pretty good.

    When you get inside, see whether they have a silicone diaphragm or a neoprene one. If it is neoprene, switch it out for a silicone diaphragm (same size). Also, take a look at the demand lever. If the demand lever is a curved metal-on-metal (lever to diaphragm plate), change the lever out to a newer one with the top having a teflon (I think) dome to interact with the diaphragm plate (newer lever). Those are my two suggestions.

    I'm pretty sure that the Conshelf VI was before the Conshelf became a balanced first stage. That happened, according to one of my catalogs, with the Conshelf XI in about 1972. Therefore, you will want to set the interstage pressure at about 500 psig on the tank, as the IP will increase with decreasing tank pressure. This is exactly like the DA Aquamaster you're looking to use it with. Actually, if you get inside, you may find that the internal parts for the Coshelf VI are the same as for the DA Aquamaster in the first stage.

    SeaRat
     

    Attached Files:

    Voit Blue 50 and axxel57 like this.
  8. Luis H

    Luis H Instructor, Scuba

    # of Dives: I'm a Fish!
    Location: Maine
    3,039
    1,386
    All the Conshelf had basically the same balanced first stage. The only difference between the Conshelf VI and the later Conshelf is that the VI had a short "spring block" (balancing chamber) that only used a single O-ring without the back-up ring. If the regulator was ever serviced, it is very likely that the balancing chamber (spring block) was upgraded to the later version that accommodates the O-ring with the back-up ring.

    The Conshelf VI also only had one LP port for the second stage and one HP port for a pressure gauge.

    The Conshelf came out in 1965 and it was advertised as having "The adjustable balanced first stage is the same as used in the famous "Royal Master".

    All the Conshelf first stages and the early Titan regulators used the same replacement internal parts. The only real difference between them is the number of LP ports (they all have just one HP port, but the size did change from the 3/8" port to the newer 7/16" HP port).


    The regulators that looked similar and were not balanced, and features: "Aqua Master" first stage, were the "Aqua-Div" and the "Hydro-Lung" Supreme. They both disappeared in 1964. The "Aqua-Div" first showed up in 1961 with a "Tilt" upstream demand valve second stage (Housing of Black Cycolac).
     
  9. John C. Ratliff

    John C. Ratliff Instructor, Scuba

    # of Dives: I'm a Fish!
    Location: Beaverton, Oregon
    3,054
    1,782
    Thanks Luis for the information; I stand corrected. Dave, you can ignore what I said about adjusting the IP. Use Luis' information.

    SeaRat
     
  10. Art Challacombe

    Art Challacombe Registered

    # of Dives: I just don't log dives
    Location: Hawaii
    27
    42
     

Share This Page