[R-390] R-390A LINE VOLTAGE REDUCING QUESTION?

[Bob Camp]

Hi

The reactance of the coil would work the same way as the resistance of the resistor. There are a few if's though:

1) The coil would need to be rated for 60 Hz and the current involved on a continuous basis. 
2) The power factor would not be as good as with the resistor.
3) The coil would not "smooth out" the AC, it might take out a bit of 120 Hz (which would not bother the radio at all), it could boost 20 and 30 Hz which would bother the radio.
4) Like the resistor the line voltage stability (and thus the radio's stability) would be degraded

The right way to drop the voltage is with an auto transformer. By far cheap / simple approach is to use a 12 volt filament transformer with wires going to the proper places. 

Bob

On May 20, 2013, at 9:32 AM, Dave Sampson <challanger13041 at yahoo.com> wrote:

> hello
>  
> i have an idea for reducing high line voltage but my electronics knowlege is not up to the level of most of you guys...
>  
> instead of using a bucking transformer...could you use a choke by determining the dc resistance necessary to drop the desired amount of line voltage and as an extra bonus, the reactance of the choke would smooth out the a/c waveform.
>  
> would this work?
>  
> 73s
> dave
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