[R-390] variac

[Steve Hobensack]

Using a variac to lower voltage for a boatanchor is overkill. The age old 
trick of using a filament transformer works great. Hook up the low side of 
the filament transformer in series with one of the AC lines going to the 
rig. Hook the high side of the filament trans across the ac line. Be sure to 
check the resultant voltage. If the polarity is wrong, you will boost 
voltage instead of buck. Be sure the current draw of the rig is not more 
than the filament trans low side winding can handle. Return the variac to 
the test bench.
.....Steve....KJ8L

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