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Originally Posted by Minion  Also I hear that Bypassing the Lytics that are in the signal path with a good quality 0.1uF Metal Film or poly cap helps reduce the High frequency distortions that Lytics are known to cause.....  |
Back in the '70s I did some experiments with paralleling electrolytics with film caps to improve their performance in a difficult application (mostly to improve DF, ESL, and ESR). I found the optimal size for a parallel film cap was no smaller than 10% of the total capacitance to get significant performance improvements. In my experiments more than 10% was wasted and less than 10% was ineffective. The capacitor in question was setting a LF pole in a phono preamp gain stage. By adding the appropriate film capacitor in parallel the circuit's phase response at 20kHz improved tens of degrees (probably due to lower ESL).
For many applications a film cap of even 1/10th the nominal capitance will still be rather large and if the original cap isn't working that hard in the first place there won't be much deviation from ideal to improve. So yes this works but I would use it selectively.
Good Luck,
JR