tanks that were designed before TC was introduced were not so concerned about ensuring a steady resistance...crucial to TC. The K4 came out before TC was a viable option.
Exactly that. Sometimes it works fine, then next thing I know it won't fire or pops out of TC or produces an anemic vape. When it works, it's great. Really great. When it doesn't, I want to throw it (I call it "Baby Nuke") at a wall -- except fixing walls is too expensive.
Can't take a tank like that out of the house if you want to run in TC mode.
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