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

[John Franke]

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
>