M49C circuit details / questions

[k brown]

Wow, you must be mighty picky, or very unlucky; I have 5840 CFs in a couple of Oktava '012 bodies, and they're no noisier than any of my FET mics (more microphonic, though).

6205s, actually; but I doubt they're any different noise-wise.

 

[pasarski]

Wow, you must be mighty picky, or very unlucky; I have 5840 CFs in a couple of Oktava '012 bodies, and they're no noisier than any of my FET mics (more microphonic, though).

This has been my experience as well. My collection is too small for definitive conclusions, but from what I have, my Raytheon 5840Ws are quiet enough. Most are a little bit microphonic, some are not, and a few are too microphonic. The Philips 5840Ws seem to be noisier overall.

 

[Recording Engineer]

I have (9) mics with 5840s in them. They’re not any noiser than any of my (6) with other subminiture tube mics.