Today/tonight I drew up the preamp section for the Fender tone control in LT Spice. I added the appropriate models as SPICE directives (.inc) and pointed to them in LT Spice. I also took the opportunity to try out the potentiometer models. At the moment I have not plotted multiple variations of potentiometer values for the tone controls, however I plan to do so soon.
As the schematics show, I decided to go with the Super Reverb schematic for the preamp stage, "Vibrato" channel, with "Mid" tone control. This was a matter of taste, as I have always liked the overall voicing of the Blackface era Fender amplifiers.
I have also included a link to a free PC program that plots frequency response simulations for various tone control types. It is called Tone Stack Calculator. The program allows the user to substitute different values of components and get a visual representation of the overall frequency changes.
I plotted a graph for the component values used in my planned tube preamp stage. It looks quite close to the LT Spice simulation results.
Next steps: Plot multiple frequency responses for changes in potentiometer variation. Draw up the rest of the tube amp schematic, with component designators, and make a list of parts needed so I can begin the physical build.
4-7PM, 11PM-12AM (4HRS)
4-7PM, 11PM-12AM (4HRS)
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