[AMRadio] Series capacitor equalizing resistors - now Johnson Power Plugs

[Mark Foltarz]

Mike,
  
  You are absolutely correct about those fused line plugs.

  But I got to thinking about the philosophy behind those things.

  Way back when, proper installation of radio gear was specified as including a
ground - both RF and electrical. If the operator made the installation
correctly, the chassis was always cold.

  I think the engineers of that time believed that the operator was going to be
responsible and install that chassis connection to a real electrical ground.

  Just a thought. Was operator forethought and responsibility part of correctly
using those plugs or were they just plain dangerous?

  Yours,

  de KA4JVY
  Mark
 

   

--- Mike Dorworth K4XM <k4xm at arrl.net> wrote:
> Hi folks, just a little about the fused line plugs. You don't see them
> anymore because of their killing ability, which is very good. All you need
> is the fuse in the cold side of the line blown and of course the hot stuff
> goes in through and all the way back to the open fuse meaning the entire
> thing is full of juice waiting for a finger, might have been alright if they
> were polarized  which there were not and of course the sockets were not
> either.. RIP with those literally.. 73 Mike K4XM
> ----- Original Message -----
> From: Mark Foltarz <Foltarz at rocketmail.com>
> To: <amradio at mailman.qth.net>
> Sent: Wednesday, February 26, 2003 3:57 PM
> Subject: Re: [AMRadio] Series capacitor equalizing resistors
> 
> 
> > Wayne,
> >
> >    The other oddity of that period was of course the fused plugs that
> Heathkit,
> > Johnson and other manufacturers used.
> >
> >    Come to think of it, do you suppose the cord on that particular AT-1 is
> not
> > original? I forgot if you described the schematic as specifically not
> having a
> > fuse anywhere including the line cord.
> >
> >  Yours,
> >
> >   de KA4JVY
> >   Mark
> >
> >
> > --- Sara & Wayne Steiner <saw at kans.com> wrote:
> > > Mark
> > >
> > > The AT-1 manual says 450v, however mine runs about 460v. So , yes you
> are
> > > right, the series combo has a rating of 700v which is substantially more
> > > than what it sees.
> > > As I mentioned earlier, the AT-1 has no fuse (mine will soon have one ).
> My
> > > AT-1 was a $5.00 flea market item which came without the power xfmr. The
> > > corner of the chassis where the xfmr was mounted was covered with black
> crap
> > > where the xfmr obviously had a melt down probably due to a failed filter
> > > caps and no fuse protection!
> > >
> > > 73
> > > Wayne, N0TE
> > >
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> >
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