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Of the 2 vibrators I have had my hands on both were DOA and had to be brought back to life. They do make an audible buzz in opperation.
It took like 10 minutes of cranking the voltage up for brief 1 second spurts (once or twice I hit 60 on the variac), letting it sit at 12-24V for 5-10 sec and banging it on the table not quite hard enough to dent mine to revive it...
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