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My FSQ (tube 106mm) uses about 18 ohms and my FS-60c (tube 60mm) uses 28 ohms. You must insulate the outer surface to ensure you don't lose too much heat outwards. I don't bother with PWM stuff. I know it makes great sense, but I have got by without it so far - 8 years now. A modest, constant temp is perfect.
If you are interested to know more PM me and I will give you the details on how to do it. Seriously, it is really cheap and very efective.
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