[R-390] Variacs and solas: additional thoughts

[Bob Camp]

Hi

A three amp filament transformer will give you a three amp buck or  
boost transformer.

The confusion comes from the fact that the three amp transformer is a  
36 VA part. A three amp 120 volt transformer would likely be a 360 VA  
part.

     Enjoy!

         Bob Camp
         KB8TQ



On May 1, 2005, at 9:39 PM, Barry wrote:

> I was thinking the amperage rating of the bucking transformer was
> proportional to the total voltage.  In other words, a 3-amp. 12V  
> bucking
> transformer would be good for approximately 30A total load at  
> 120V.  Is that
> incorrect?
>
> Barry - N4BUQ
>
>
>
>
>> 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
>>
>
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