Invader Jima wrote on Nov 24th, 2013 2:24am
Full-size version: http://i41.tinypic.com/2dbkwes.jpg
You are welcome.
I included an idea to utilize the unused op-amp section to add Bass and Treble controls (circuit from the Frontman 25R). To fit the extra pots you'd have to re-house the circuit (which would free up the box for a tube amp such as my Radio Champ ). I also indicated 25R values for the Mid part of the tonestack.
The stock Tone control is actually a backward Mid control which I hate. You could swap the locations of C7 and C9 to make it act better but I would rather use a different tone control altogether.