[R-390] Powerstat

[Roy Morgan]

On Apr 20, 2009, at 11:15 PM, K3DX wrote:

> I have a nice little 1.75A Powerstat autotransformer, still in the  
> box.
> I'd like to use it to drop the line voltage to 115 for my R-390A.
> If I turn off the ovens in my R-390A, the powerstat should
> handle the load, don't you think?

Yes, it would, but find instead a little 12 volt transformer at 2+  
amps.  Run the transformer in bucking mode against the line and feed  
IT from the little variac.  If  you find a 10 or 15 amp 12 volt  
transformer, you'll have a nifty  line adjuster that will bring down  
your 122 to 125 volt line to 113 volts and never get even warm.

This is basically what General Radio did in their automatic line  
regulator that would handle 30 amps over plus or minus 10 volts from  
line input.

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073