Adjustable notch filter?

[Xander8280]

But I imagine that at 0ohms the notch is completely gone? The graphs show some attenuation at the band when 1R is the resistance. I am wondering if the attenuation isn't noticeable? I'd like the control of zero notch to a deep notch.

IF you place your RLC filter from signal line to ground, you'll find the notch to be deepest with zero ohms. And one ohm isn't going to change that much. Keep in mind the inductor has its own built-in resistance that will limit the depth of the cut. Any R added to that will reduce the depth of the notch. If you would get your hands on an inductor and try it, you would see what's going on in less time than it takes to type this. By using a pot, say 100K, you can vary the notch depth from nothing to max depth. And most of the cut "action" will happen at fairly small R. I recall in the Hiwatt I modified, the max depth was 28 dB - that sure put a "hole in the mids" without a doubt.

Thank you! Much appreciated!