Favorite Coupling caps in Preamp?

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One day down the road when I have time and more money, I might have to try a rotary switch hooked up with different caps of the same value to test this. It would be interesting as you could choose the totality/distortion/sound of the pre-amp to the style of music at will.

It would probably change the size of the pre-amp too.
 
Choosing a value that can pass the Signal frequency range is more important than anything else.
Choosing a type that suits the duty comes second.
Choosing a manufacturer has little to give beyond getting the first two correct.
If you break rule 1, then expect every change to sound different, as the passband will now change with any small difference in capacitance.
When the chosen capacitance is incapable of passing the required signal, then you will also find that the AC signal across the capacitor is not near zero and this will directly affect the distortion that the chosen cap will add to the signal.
 
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