In message , Colin Dawson
writes

A word of warning about the power cable - Make sure that the polarity if
correct. I can't re-iterate this enough, get it wrong and the electrics of
the scope could get damaged! I've seen it happen!!!!! (not to my scope
though)

I've seen it happen too, but is there some good reason why the
manufacturer (or a DIY-er) can't incorporate a diode in the circuit so
reversing the polarity does no harm?
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Save the Hubble Space Telescope!
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