Just 20 years ago I used to encounter DC residential service in some
locations in New York City (Manhattan). Now these would make short work of
transformer input devices. There were other neat phenomena, only one end of
a fluorescent tube or neon light would glow; switches would draw long, blue
white arcs and generate ozone. AC motors would open their windings in a real
hurry. Apparently these residential DC services were a hold over from Tom
Edison's original electrification work in NY.
Unsuspecting folk would move in, and plug in their new TV set or stereo,
and then open the windows to let the smoke out.
As a young man, part of my job at the time was to locate these services and
have the dangerous situations removed, sometimes at the 'request' of the
plaintiff's attorneys.
I know this is off the main topic, but only by 25 Hz.
Ed
----- Original Message -----
From: "Larry Molitor" <w7iuv@earthlink.net>
To: <amps@contesting.com>
Sent: Monday, April 09, 2001 10:46 AM
Subject: Re: [AMPS] 50hz? 25Hz???
>
> Downtown Chicago was one such place. Many elevators in the "loop" still
ran
> on 25 Hz until sometime in the sixties. I remember seeing, at the power
> station where my father worked, the huge motor-generator that was used to
> convert the locally generated 60 Hz to 25 Hz for distribution to select
> customers. The conversion from 25 Hz to 60 Hz for "consumers" was done
> before I arrived on the scene.
>
> Larry - W7IUV
>
> At 09:27 AM 4/9/01 -0400, Bob Duckworth wrote:
>
> >Have a receiver here and power supply is marked 25Hz. USA made for USA
> >market.
> >Who knows when and where in USA 25Hz was so common that 'consumer
> >electronics'
> >was manufactured to operate on it.
> >
> >-bob
> >
> >--
> >FAQ on WWW: http://www.contesting.com/FAQ/amps
> >Submissions: amps@contesting.com
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>
>
>
> --
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>
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