:I recently bought an RCA Wavetrap, model 33033, at a flea market. Inside the shield can are a variable inductor (iron core), a 910 pF capacitor, and 2 unmarked capacitors. Does anyone have the instruction or spec sheet for this filter? I successfully connected it to null out AM stations in the low end of the band, but not the hi end. It has 6 terminals, labelled A thru F.