[Milsurplus] Edison/Tesla battle finally ends in NYC.

[Bob Camp]

Hi

A lot more than farms were set up for 28 volts back in the early  
1900's. Rig a stationary motor to drive a generator, and you have  
electric light in the evening. My guess is that the bare wire / nail  
in knob insulator wiring dates to that period. I also suspect that  
military 28 volt systems have a link to those farm / home systems.

Bob


On Nov 22, 2007, at 10:09 PM, John Franke wrote:

> Farm radios operated on 30 volt dc from windmill generators.  I have  
> an old farm radio where the 6D6 and 6C6 tube filaments are in series  
> and the 30V is also the plate supply.  It has a normal two-prong ac  
> plug with a tag saying to only plug into a 28V-30V outlet.  Of  
> course you also had to get the polarity correct.
>
> John  WA4WDL
>
> ----- Original Message ----- From: "Bob Camp" <ham at cq.nu>
> To: "D C *Mac* Macdonald" <k2gkk at hotmail.com>
> Cc: "Milsurplus Radios" <milsurplus at mailman.qth.net>
> Sent: Thursday, November 22, 2007 8:54 PM
> Subject: Re: [Milsurplus] Edison/Tesla battle finally ends in NYC.
>
>
>>
>> One of my first electronic puzzles was a gizmo I found up in the   
>> attic. I now know it to have been a 25 Hz to 28 volt DC converter.   
>> They were a popular item back in the early days of suburban   
>> electrification. Apparently the first customers were people who   
>> already had 28 volt setups in the house.
>>
>> Bob
>>
>
>
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