[R-390] Variacs and solas: additional thoughts

[Steve Hobensack]

   One can parallel the secondary to make a 6 amp 6 volt transformer, thus a 
6 amp 6 volt buck. I have peeled back the yellow plastic tape at the center 
tap and discovered the center of the winding had been brought out to the 
solder tab, revealing two copper wires. Test the polarity before the final 
soldering!
....Steve...N8YE

Message: 3
Date: Sun, 01 May 2005 21:23:41 -0400
From: Bob Camp <ham at cq.nu>
Subject: Re: [R-390] Variacs and solas: additional thoughts
To: Gene Dathe <dathegene at hotmail.com>
Cc: r-390 at mailman.qth.net
Message-ID: <5FEB3020-D024-4F35-87FE-B636DDA08DA5 at cq.nu>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Hi

For a whopping $10 Radio Shack will sell you a three amp 12 volt
center tapped filament transformer. The nice thing about the center
tap is that it will give you both a 5% and a 10% adjustment off of a
nominal 120 volt line. Three amps is enough to run any radio in the
R390 size range.

Given that the radio works better off of a high line voltage it's not
real clear weather you should spend the $10 or not. As mentioned in
the previous thread using a fuse or two is probably a good idea.

     Take Care

         Bob Camp
         KB8TQ