Vintage Metal Detector Forum
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Re: Mark 1 mods plus new devices - reply
If I'm not mistaken, that's simply an audio amplifier. It's not actually increasing depth. It's just increasing the volume on the audio/headphones. Right ? So a person could accomplish the same thing by buying premium headphones (killer B's or whatever). If they have wimpy headphones (or bad hearing ), then perhaps that device would come in handy.