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Ken, ahh well anybody really: how certain are you that a controller is needed????? Obviously some have them, but do the really need them?
I mean a low wattage heater is simply not going to melt down the Object glass. I don't have one, I don't need one so why do others? I inserted a thermocouple between the heater ( an Astrozap) and the corrector lens assy initially, and watched. Before there was much of a temperature change, the heat lost by exchange equalled the heat input by the pad::: no dangerous heating of the corrector. The lower the ambient temp, the more power was needed, but certainly no controller.
BTW, using a series resistor to control what? Temp? Current? is gross inefficiency. At a minimum, use a pass transistor, but really try using your heater without a controller. If your heater is about 20 watts or so as also indicated by Bert, you will find that you will not need a controller.
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