[Hallicrafters] Power Transformer Rewinding Service

[Multi-Volti Devices]

For all Edison's inventions...he had no clue why things worked or didn't.

Tesla was a heck of alot more educated...he understood why things would work
and why they wouldn't. Probably wouldn't have taken him 1100 experiemnts to
get a filament that worked in a light bulb.

Murray
-----Original Message-----
From: George T. Baker <w5yr at WORLDNET.ATT.NET>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Sunday, January 16, 2000 1:31 PM
Subject: Re: [Hallicrafters] Power Transformer Rewinding Service


>Just one problem, Ed.
>
>Don't blame it on Edison! His distribution system was all DC from
>generator to load. No AC anywhere! In fact, Edison argued to his dying
>day that AC could not work and was a fiction - sound familiar? His
>clashes with those developing and installing AC networks are classics.
>
>His choice of 100 volts was more likely based on what it was economical
>to generate and how much loss he was likely to encounter getting service
>to a given location.
>
>Remember that he had no way to compensate for load changes, line drops,
>etc. other than to have a number of generating stations scattered around
>and to vary the voltage output of each in an effort to keep the loads
>running properly.
>
>Serving only a network of fixed street lights was the easy part - his
>downfall came with residential and industrial applications with varying
>loads for which his DC system just couldn't cope.
>
>As I recall from reading - honest, I wasn't there! - he also had no way
>to do grid-like power networking with DC like they can do with AC
>systems.
>
>Interesting stuff.
>
>72/73, George
>Fairview, TX   30 mi NE Dallas in Collin county
>Amateur Radio W5YR, in the 54th year and it just keeps getting better!
>R/C since 1964 - AMA 98452   RVing since 1972
>
>
>Ed Richards wrote:
>>
>> Good morning;
>> I have addressed this subject before, but it looks like I need to do it
>> again. My understanding is that old Thomas Alva picked 100 volts (a nice
>> round figure) for his distribution voltage when installing the first
>> street lights. It soon became apparent that this was too low as it
>> required large, heavy, expensive wire, transformers, motors, etc. Since
>> then the industry has been gradually increasing the voltage so as to
>> reduce the cost, size and weight of these components. When I was a kid
>> (1930's) the official voltage was 110 VAC. Since then I have seen it go
>> to 113, 115, 117, 120 and now 122 VAC. The Europeans were smart enough to
>> use 220 VAC from the beginning.
>>
>> I keep harping on the fact that I believe that running old radios
>> designed for lower voltage on todays higher voltage is responsible, in
>> part, for all the transformer failures. A simple solution is to use a
>> filament transformer with a secondary equal to the voltage difference you
>> want. Wire the primary across the line normally and the secondary in
>> series with the line to the radio. Be sure to check it both ways first as
>> one way will add to the line voltage and the other subtract from it. The
>> secondary should be rated equal or better than the primary current the
>> radio draws. Fair Radio Sales has a number of filament transformers at
>> reasonable prices.
>> 73,
>> Ed Richards
>>
>>  —why did power companies raise the line voltage like that?)
>
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