mudshark
Vaporist
Correct. I thought you were inquiring about your older underdog vaporizer which has a resistor? The current versions of underdog vaporizers utilize a SS heater cartridge, which is more robust.
Correct. I thought you were inquiring about your older underdog vaporizer which has a resistor? The current versions of underdog vaporizers utilize a SS heater cartridge, which is more robust.
darkrom
Great Scott!
You don't have one yet? BUUUUUUDY! Get in on this lol.
That mini for little $$$ is tempting, but those exotics Dave posted oh god! If I didn't have 2 underdogs already I'd be scrambling to grab one now.
ataxian
PALE BLUE DOT
RUDE BOY
Space is the Place
Yeah unfortunately "that tempting mini for little $$$" was @SSVUN~YAH 's funny haha April fools contribution.
-francois-
Well-Known Member
@mudshark Thanks, you are right I had not understood that the older ones had resistors
SSVUN~YAH
You Must Unlearn, What You Have Learned...
Last edited:
You guys (and gals) in this community are great! I don't think I've ever seen such a helpful and friendly group, especially online, and I just wanted to say I appreciate all of you and the help and kindness you all share. 
What we typically call the 'core' is indeed a number of metal pieces affixed together and fastened into the wooden body. The 'heating element' in older Dogs (and occasionally new ones too if indicated) is a resistor (20ohm normally), in new UDs it is (unless otherwise indicated per above) a stainless steel heating cartridge instead. In both cases heat is generated as power (voltage * current) flows through the nichrome wire inside the resistor/cartridge. This flow, over time, eats away at the nichrome wire and it's resistance rises until it eventually fails altogether when it wears all the way through (the wire). As a result of this increased resistance the heating element draws less power and runs cooler. I like to compare this mode of failure to that of a light bulb.. they work, work, work until one day they don't.
Both the resistors and the cartridges can also fail from physical (non-nichrome wear) damage such as overheating, impact, etc. The cartridges are more robust in this regard than the glass/ceramic resistors which is why we switched. That said the resistors are actually pretty damn tough, the cartridges are just that much tougher.
Hope that answers your questions somewhat? If you want to really get into the theory (or like math) of this kind of stuff I can send you an article or two that cover it in detail.
Yep, 20ohm is the 'standard' across low voltage Log Vapes (PD, Zap, UD, HI, Wdz) and they do vary a bit from resistor to resistor. We have also on occasion used some with slightly higher or lower values as needed but they're all close to 20ohm.
Hi,
I've go a question I can't get out of my headWhen I asked earlier what may be the causes of my underdog not working anymore. @underdog said to me : since it's a really old device, perhaps the heating element is reaching the end of its life. But what intrigues me is what causes the death of the heating element ? I have always thought that the heating core was a pileup of metal pieces. And then thanks to Joule heating the passage of an electric courant through the metal core releases heat.
So what are the wearing parts in this process ? Why could the heating element become less efficient within years ? Thanks :-)
What we typically call the 'core' is indeed a number of metal pieces affixed together and fastened into the wooden body. The 'heating element' in older Dogs (and occasionally new ones too if indicated) is a resistor (20ohm normally), in new UDs it is (unless otherwise indicated per above) a stainless steel heating cartridge instead. In both cases heat is generated as power (voltage * current) flows through the nichrome wire inside the resistor/cartridge. This flow, over time, eats away at the nichrome wire and it's resistance rises until it eventually fails altogether when it wears all the way through (the wire). As a result of this increased resistance the heating element draws less power and runs cooler. I like to compare this mode of failure to that of a light bulb.. they work, work, work until one day they don't.
Both the resistors and the cartridges can also fail from physical (non-nichrome wear) damage such as overheating, impact, etc. The cartridges are more robust in this regard than the glass/ceramic resistors which is why we switched. That said the resistors are actually pretty damn tough, the cartridges are just that much tougher.
Hope that answers your questions somewhat? If you want to really get into the theory (or like math) of this kind of stuff I can send you an article or two that cover it in detail.
Yep, 20ohm is the 'standard' across low voltage Log Vapes (PD, Zap, UD, HI, Wdz) and they do vary a bit from resistor to resistor. We have also on occasion used some with slightly higher or lower values as needed but they're all close to 20ohm.
-francois-
Well-Known Member
Thanks a lot for answering my question ! It's very precise : I understand now how it works and why resistors can fail.You guys (and gals) in this community are great! I don't think I've ever seen such a helpful and friendly group, especially online, and I just wanted to say I appreciate all of you and the help and kindness you all share.
What we typically call the 'core' is indeed a number of metal pieces affixed together and fastened into the wooden body. The 'heating element' in older Dogs (and occasionally new ones too if indicated) is a resistor (20ohm normally), in new UDs it is (unless otherwise indicated per above) a stainless steel heating cartridge instead. In both cases heat is generated as power (voltage * current) flows through the nichrome wire inside the resistor/cartridge. This flow, over time, eats away at the nichrome wire and it's resistance rises until it eventually fails altogether when it wears all the way through (the wire). As a result of this increased resistance the heating element draws less power and runs cooler. I like to compare this mode of failure to that of a light bulb.. they work, work, work until one day they don't.
Both the resistors and the cartridges can also fail from physical (non-nichrome wear) damage such as overheating, impact, etc. The cartridges are more robust in this regard than the glass/ceramic resistors which is why we switched. That said the resistors are actually pretty damn tough, the cartridges are just that much tougher.
Hope that answers your questions somewhat? If you want to really get into the theory (or like math) of this kind of stuff I can send you an article or two that cover it in detail.
Yep, 20ohm is the 'standard' across low voltage Log Vapes (PD, Zap, UD, HI, Wdz) and they do vary a bit from resistor to resistor. We have also on occasion used some with slightly higher or lower values as needed but they're all close to 20ohm.
But do not worry for your underdogs, my underdog which is quite old has finally no problem with its resistor. The issues I experienced came from my power supply : it died before the vaporizer ^^ And perhaps my underdog will see many others power supplies before it dies itself
Everything is indeed back to normal now that I changed the power supply. It works as well as ever :-)
Last edited:
RUDE BOY
Space is the Place
That's awesome news @-francois- sure glad it was a simple and cheap fix and that your back up and running with a healthy pup already.
Enjoy the sweet vapor.
... 
Enjoy the sweet vapor.
...
@-francois- Great, so glad to hear you got it up and running again! We're always here to answer questions and help out however we can and hope to see you around here in the future.
paytonpenn
Level 30 Nature/Healer
Promiscuous pup?And perhaps my underdog will see many others power supplies before it dies itself
TeeJay1952
Well-Known Member
You know the French.....(not that there is anything wrong with that)
ataxian
PALE BLUE DOT
My wife is from PARIS!
Madcap79
Jack of all trades, master of none.
Beautiful collection!!Who let the dog's out!?!
various127
Well-Known Member
I'm thinking about buying an air core, but I feel like if I pick a dog it should be a regular one. But the price point is the only reason I'm thinking about getting one at this point, since I don't have much to spend.
NickDlow
Log Hog
I don't think the Air Cores are a good option for people new to the Underdog pack. I think a better option and a better value even at $40 more is something like the 'Vape Special' with it's compatibility with our full line of stems, better warranty, stainless heating element, etc.
Getting ready for 420! All our regular vapes are currently 10% off. Use UDFS in the coupon code field to get free shipping. If you've been eyeballing one of those vapes, now's the time to grab it, and stay tuned for more 420 fun!
I always use a dropper for this very reason. Yes! Lemon grass is amazing! Enjoy!I just wanna say I dislike the new oil jars, whenever I pour them into the cup, I end up spilling down the side of the bottle and making a mess
Lemongrass is amazing though.
I have the old bottles still, so I'll just do that now..