[R-390] OT? Dimmer buzz, solution?

[Dave or Debbie Metz]

While this is probably not within the parameters of heavy iron, I do have a 
question for the collective wisdom of this esteemed group. I have been 
haunted for years by lamp dimmer buzz radiated as RF that gets picked up 
with my basement hobby an the AM that the R-390 wants to hear.   Recently, 
I purchased a Lutron Lamp Debuzzer Coil  LDC-10-TCP in another attempt to 
eliminate this radiated hash. Low and behold the $110 investment worked 
fantastically!  Now what I want to know is how to build such an animal for 
a lot less than $110!   All there is to this is a box about the size of a 
smaller ballast transformer with two wires. It goes in series between the 
dimmer and the light load. They have very specific amperage ratings , 
400-600 watts, 600-1200 watt, and 1200-1920 watts depending upon the needed 
load range.  It sure is great to now have the XYL upstairs watching TV with 
a dimmed light and I can listen to the DX BC band on the 390!  There has to 
be a cheaper solution for the rest of my dimmed light circuits.
73's
dave