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[ratite]

I wondered,are Gudeman 1 microfarad/160V? caps as well regarded as the Bosch or Seimens/Halske?

Would I hear a difference if I swapped out the Gudeman in my M49b?

Was this an original part?

What are the preferred current manufacture PIO's for coupling caps,or is it preferable (soundwise,not for authenticity/resale) to hunt down the originals?

[Kai]

I cannot comment on the audibility of capacitor differences, except with the really bad ceramic ones that are not suited for audio anyway.

I can measure capacitor distortions down to -155 dB, and there are very few that are below this line.
Paper/oil types (the ones that are relevant for this posting) have distortions widespread in the range around -120 dB.

Every type and model of capacitor is different, and there are large unit to unit variations within a batch of the same model.

When historic mics where built, the manufacturers chose what was available and suited for the job.
Had their choice been a “lucky punch” or doesn’t it matter?

[klaus]

Please share with forum readers those capacitor types and brands that are at the lower end of distortion and how using them would affect performance.
Thanks!

[RuudNL]

Of course one can question how important distortion below -120 dB (0.0001%) is...

[ratite]

Any thoughts on the original questions?
If you are restoring an M49 what cap do you choose?
Is the Gudeman likely original?

[RadarDoug2]

So Kai, can you hear distortion products at -120 in the presence of signal? Thems some super ears!