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I don't like resistors. Use Nichromium wire instead. You will get much better heat tx to the metal of the scope. Resistors are great except it is hard to get them in metal to metal contact with the scope. So in effect you may have 4.8 W of heating power but only a fraction is entering the scope. The rest is going off to the air. You can ge that wire from Jaycar or DSE. Get the highest ohms per metre you can but generally you will need to put a few winds around the tube.
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