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Simple test Tony.
Try unplugging the resistor. If there is no change, it is probable faulty. If the changes are even harder, it is probably good.
(Replacements from the US are far cheaper than from your UK dealer.)
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Andy
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If I would be a young man again and had to decide how to make my living, I
would not try to become a scientist or scholar or teacher. I would rather
choose to be a plumber or a peddler in the hope to find that modest degree
of independence still available under present circumstances.
-- Albert Einstein, The Reporter, November 18 1954
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