I have almost abandoned the electronic side of the guitar world and kind of miss the smell of rosin wafting up in the room. I get the Fender world of amp design until Leo left the company, still think he took a wrong turn leaving the Tweed Bassman behind. I figured I would dip my toe into these waters to get an idea where that iconic design has gone. I saw a thread on changing from a Plexi to a 2203/4 preamp and rearranged things till I thought I had a good compromise given a single toggle switch to change states (a four pole switch mind you). The two pole three position switch on the tone stack is my take on some functionality with the standard Marshall response, the 56k Lead response and for kicks the Blackface scouped Fender curve. But one thing that was mentioned was getting the 2203/4 flavor but not needing to switch input jacks to get the Plexi vib. So I took that as there wasn't a real need for two holes to plug into, well there is jumpering channels but let's put that aside for now. So with what really amounts to an amp with a normal and lead channel I started rearranging things. It made sense to have a drive and individual volume knobs for the clean and dirty channel, standard fair now days. So while not the 2204/Plexi as stated in the schematic it does have them in its roots. Ignore the IC, the idea might be to go to a Class D amp, maybe even this in a pedal format. At the moment just a design exercise. I duck here now as the popcorn boxes come flying at me.