[Boatanchors] Heil Microphone Equalizer 300

[David Knepper]

Need a schematic of this unit or the manual.  Heil does not have any literature.

Bob Heil's article  in QST some years ago detailed his earlier 200 model which is different than the later 300 model that uses just one IC.

Thank you

David Knepper, W3CRA/W3ST
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