Silver mica capacitors in microphones?

[rock soderstrom]

Hi guys, is there anything wrong with using silver mica caps in microphones? For example, the 100pF from the anode to ground in the M251 or also as a coupling capacitor from the capsule to the grid?

Some people write that they tend to be microphonic, others say it's not a problem?

What is your opinion?

 

[gyraf]

not a problem, those are nice caps

I prefer styrene though, but probably most for habitual reasons

 

[rock soderstrom]

Thanks for feedback Jakob, I will try. The silver micas fit better into my narrow housing.