[BC] 110 V DC AC/DC radios 5 tube all american

[nakayle@gmail.com]

Sometime in the mid-50s the UL began requiring these radios to use
"floating ground"- meaning that the circuit-ground was isolated from
the chassis except for a resistor/compactor combo that provided "RF"
grounding.  The capacitor could pass enough AC to bite a bit if you
touched the chassis and a earth-ground but was much safer than
connecting the AC line directly to the chassis.

As for polarized plugs I don't know why it took them so long to start
requiring those but I don't think I saw them on electronic stuff until
the early 1970s.  Now nearly everything has them.

 - Nat

On 12/2/06, Paul Smith W4KNX <paul at amtower.com> wrote:
> Was only dangerous if you put the plug in the wall the wrong way.... Good
> thing for polarized plugs, huh?
> Paul Smith
> W4KNX
> Sarasota, FL
>
>
> ----- Original Message -----
> From: <ChuxGarage at aol.com>
> To: <broadcast at radiolists.net>
> Sent: Saturday, December 02, 2006 5:51 PM
> Subject: [BC] 110 V DC
>
>
>
> >
> > Of course, a lot of the attraction of the AC-DC radios was they were
> cheap.
> > Dangerous by today's standards, but cheap....
> >
> > Chuck Conrad
> > KZQX Radio
> > www.kzqx.com
> > _______________________________________________
> >
>
> >
> >
>
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