Originally Posted by
Earl K
(iv) Worth considering about possible induced microphonics into capacitors is the effect of DC biasing . One purported benefit ( from the K2 S5500 copy ) to biasing is that it pre-"swells" the capacitors' dielectric layers.
So; expanding on that thought :
- If the caps inside expands against a flimsy wall ( like Solens ) / the resonant microphonic signature should be somewhat lower than a hard wall. This will need a specific approach to "energy" dumping to avoid so-called "blooming".
- If the inside expands against a firm wall ( like some hard shell caps / or especially those already encased in epoxy ) / the resonant microphonic signature should be much higher ( perhaps supersonic ). This will need a different approach to "energy" dumping to avoid "UHF ringing".
Example - My main "go to" RC surplus capacitors have the metallized polypropylene core encased into hard epoxy . They start off very quiet & once "DC biased" they are even "quieter" , offering ( I believe) a much deeper sense of resolution