Quote Originally Posted by HighFidelityGuy View Post
Is there an upper limit to the capacitor rating that can be used for this mod?
For example, would using a 220uF 6.3V cap be a bad idea for any reason?
Since the circuit is completed via your preamp's input circuit you could leave yourself open to large thumps when you play music and the muting relay disengages, charging the capacitors all of a sudden.

This happened to me with some Elna Silmics (which I suspect are leaky) and my power amp went into protection shutdown!

In any case, you shouldn't need such a large value as the corner frequency will be unnecessarily low.