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 power cords +fuses

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D R FORD



Posts : 1
Join date : 2010-10-15
Age : 56
Location : canton ill

PostSubject: power cords +fuses   Fri Oct 15, 2010 7:08 pm

hi guys last weekend i picked up a Bendix 656-A radio/phono that needs a new drive tire for the turntable and cord.i also got a Majestic 310-A that has spray coated tubes? needs tuner knob and cord too. i would like to use polerized or 3prong cords and fuses if i can? bendix had a little tingle on the turn table thanks dave
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radiotechnician



Posts : 35
Join date : 2010-10-12

PostSubject: Re: power cords +fuses   Fri Oct 15, 2010 7:30 pm

Before you ground the chassis measure the 'tingle'Fuses can be deadly. One can blow because of short to line cord leaving a dead radio still plugged in waiting for something to touch it. Take a look at how Sencore Powerites handle this issue.
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K6JEK



Posts : 2
Join date : 2010-10-17

PostSubject: Power cord safety   Sun Oct 17, 2010 4:40 pm

1) Never fuse the neutral
2) Replace any AC bypass caps with X1/Y2 rated caps or clip them out entirely
3) 3 wire cord is fine idea for anything but museum quality
4) It's not a bad idea to use a big isolation transformer when working on old, questionable stuff.

Having spent decades working around high voltages I was chagrined to get one heck of shock from plain old AC mains. A sheet metal screw had pierced the insulation of the wire to the power switch on an SX-62 on which I was doing initial checks (rectifier out, is power transformer OK). Chassis was hot. ZAP.

Since then I have religion on three wire cords
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