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Metal Detectors
Minelab
Early 4500 vs later model 4500
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<blockquote data-quote="grubstake" data-source="post: 674218" data-attributes="member: 4012"><p>I'd suspect it's transformer hum (don't know the official tech terminology for it, if any). I've got a microscope that does it and used to have a Colemen LED camping lantern that did it too. It can be damned annoying, like having a mozzie lurking around all the time, but I don't think it's anything to do with a current leak - just an aging transformer somewhere in the circuit.</p></blockquote><p></p>
[QUOTE="grubstake, post: 674218, member: 4012"] I'd suspect it's transformer hum (don't know the official tech terminology for it, if any). I've got a microscope that does it and used to have a Colemen LED camping lantern that did it too. It can be damned annoying, like having a mozzie lurking around all the time, but I don't think it's anything to do with a current leak - just an aging transformer somewhere in the circuit. [/QUOTE]
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Metal Detectors
Minelab
Early 4500 vs later model 4500
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