Crowther Hotcake Presence control?

Started by ljudsystem, February 27, 2018, 01:39:43 PM

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ljudsystem

Can someone explain the Hotcake presence control?

The 77 version looks like two lp filters in series and the later one has a variable low pass, or am I missing something?

From the name I assumed it would be some sort of bandpass filter  ???


http://revolutiondeux.blogspot.se/2012/01/crowther-audio-hotcake-overdrive.html