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February 18, 2019
Not all series mods are created equally, but there is one that stands out for me as the best for so many reasons. It’s the stacked mech tubes from Deathwish Modz. Deathwish is known for creating solid pieces with detailed engravings that perform extremely well. The one I will be focusing on in this article is the Evil Twin. The other stacked tubes currently in the Deathwish lineup include the Ripper and the Baphomet. The only difference between these mod kits is the engravings depicted.
If you’ve ever tried a series mechanical mod, you know it takes things to an entirely different level. The amount of power provided is double that of single battery or parallel battery mods. The nominal voltage is 7.4v instead of the 3.7v on other mods. This of course means that you will have to use coils that are suited for this setup.
The tubes comes in brass, copper, stainless steel or gunmetal. The one in my personal collection is the gunmetal which is a coating applied to the stainless steel tube. The tube itself is one solid piece. No screwing anything together to convert it to a stack. All series, all the time. No visible line between the pieces or slightly unmatched colour, threading problems, voltage drop or engravings not lining up perfectly. These are some of the reasons I don’t like so many other stacked tubes. The Evil Twin has none of these problems since the tube is one piece. It is a hybrid mech meaning the RDA 510 post is in direct contact with the battery. The hybrid plate is removable and therefore adjustable so you can get your RD lined up exactly the way you want.
There are two options for batteries with this device. You can use two 18650’s (a special adapter is included) or two 20650’s. I use the LG HG6 20650 batteries in mine and they work extremely well. Mooch rates these as having a continuous draw rating of 30 amps. (https://www.e-cigarette-forum.com/blog-entry/20650-20700-21700-battery-ratings.7827/)
The batteries should be placed in the tube with both positive posts facing down since the venting holes on the tubes are at the bottom.
All deathwish mods come as kit, so you get a matching RDA as well. The Unholy V2 has become one of my favorite drippers ever. It’s easy to build on and can take any size build you wish to put in there. It’s a two post style RDA but the unique part is there are ball bearings embedded in the posts. For dual coil installs, this allows you to place one lead above the ball and one below. Or both above or below, whatever you like. I personally go with both leads below for the types of coils I use. Just personal preference. The heavy duty posts are inset from the edge of the RDA sufficiently to allow enough room for plenty of cotton.
The switch on the Evil Twin is pretty special. It’s a constant contact switch meaning that the battery is always touching the switch plate. Inside the switch assembly though there is a gap so the circuit won’t be complete until the button is pressed. This is an advantage because you won’t get any arcing on the battery or switch plate like you see happen with many other mods. Final contact is made to complete the circuit inside the switch itself which is machined so accurately and operates so smoothly that no arcing appears on the internals either. The two plates that contact each other are silver plated so there is no voltage drop. There is plenty of delrin in the switch housing as well for good electrical insulation.
Since this is a series mod I recommend going with builds at least 0.30 ohms or higher. Of course this is dependent on the batteries you use. Please make sure you know how many amps your battery can safely discharge and build accordingly. There are plenty of places on the internet you can go to easily do Ohm’s Law calculations. A good place for this (and tons of other useful vape tools) is http://www.steam-engine.org/ohm.html. In my setup, I’m running a set of SaddlehorseBlues Staggered Fused Claptons coming in at 0.31 ohms. They have 26g Kanthal cores and are staggered and fused with 36g Nichrome 80. These have a very quick ramp up time and provide a huge blast of vapor immediately. Another good choice are the 0.88 Fused Claptons which will dual up at around 0.44 Ohms.
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