Hi everyone. Since i bought fulltone's fulldrive 2 i've really been need more bass tone. I decide to do mod to bring bass tone back. And share is with you. Here we are...
Here is the circuit
(https://lh4.googleusercontent.com/_d95tAFHvyQc/TVe5L56h42I/AAAAAAAACJo/2EdtwSlYjWg/s640/IMG_1689.JPG)
First and last you need to do is change 0.1 uf cap to 0.22 uf (or more, read to the end). My is marked is Tracon 2A104K.
(https://lh3.googleusercontent.com/_d95tAFHvyQc/TVe6At_F6zI/AAAAAAAACJ0/-SxcBLX_lXs/s640/IMG_1690.jpg)
Here is the result. As you can see i used polarized cap, it's because i'd not usual one.
(https://lh5.googleusercontent.com/_d95tAFHvyQc/TVe5MZigxnI/AAAAAAAACJw/_PHEjhh7qFo/s640/IMG_1691.jpg)
You can change cap with even more capacitance and bring more bass. Here is cap - freq data
0.1uF - 339 Hz
0.22uF - 154 Hz
0.47uF - 72 Hz
I also changed a transistors to Germanium in experimental purposes. And they sound great ! Good Luck. Sorry for my bad english )
If you are not believe in yourself DO NOT do anything above.