Re: general question re polarized ac plugs on receivers as shipped originally
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Back in the time frame of 1974-75 power tools for CA had to have polarized plug plus double insulated. Most US brands made the switch instead of running 2 production lines. One thing that drives me crazy in old houses was you never knew if the black or white wire was HOT! Then some one installs a modern grounded outlet but no ground wire GRRRR.
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