Hybrid EQ

This EQ is going to be a kind of melting pot of all types of circuits.  The filter section is very similar to the passive filter section of the Pultec EQP-1A.  The makeup gain staging for the filter section will be where things get interesting.  I’m planning on at least two completely different gain stages.  The first is a transformer based API DOA style gain stage.  The second is a very clean tube based gain stage.  I’m also going to try and make the transformers bypassable for a different tone color on the output.  Some pics of the pcbs to date: