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Message: <blockquote data-quote="dbelousov" data-source="post: 978718" data-attributes="member: 73809">I had a very audible problem with them once in a pair of Chinese tube mics. I just glued them to the PCBs with a drop of some soft and not aggressive glue in the end.I haven't found a cap that is not microphonic at all, so it's about an "acceptable" degree I suppose, and this effect is hard to measure.I glue caps in my modded/refurbished mics with a hot glue gun. It doesn't look fancy but reduces ringing close to non-existence.https://www.digikey.com/en/products/detail/wima/FKP2G011001D00KSSD/9370222Who knows Joly's motives. Micas are used intensively by guitar amp builders in EQ sections. I believe, according to what he has done, he aimed to "open" the sound, but the major problem here is RFI filtering caps, which were remained untouched.</blockquote>