Parts Substitutions - If you just want to tweak the existing TS pedals, a good place to start is replacing the 1uF/50V NP electrolytic capacitors with 1uF/50V polyester film capacitors and the 0.22uF tantalum capacitors in the tone control section with 0.22uF film capacitors as well. The film caps are a little larger but there is room if you put some work into finding miniature parts. Mouser Electronics stocks suitable parts if you substitute a pair of 0.47uF caps for the 1uF electrolytics.
The electrolytics have a large dielectric absorption and cause a muffling of the sound. Ceramic caps are reputed to cause a harsh graininess, so are not a good choice for replacements.
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