xeawr

reasonable capsule-to-fet/tube capacitor sizes
« on: February 18, 2020, 03:23:42 PM »
In all schematics I see a maximum of 1000pF / 1nF (Schoeps, Gefell, etc.) for the coupling cap (from capsule). Neumann occasionally used lower values, such as 470pf (U87i).

What is the maximum value that is still reasonable in this position? I know that Peluso occasionally went with 1,5nF. Any drawbacks of that? What's the impact of the different values on sound?


xeawr

Re: reasonable capsule-to-fet/tube capacitor sizes
« Reply #1 on: February 20, 2020, 10:43:20 AM »
I would really appreciate if anyone could shed some light on this!  :)

RuudNL

Re: reasonable capsule-to-fet/tube capacitor sizes
« Reply #2 on: February 20, 2020, 10:48:43 AM »
As a rule of thumb: the coupling capacitor should be 10x the capsule capacity, or more.
(Neumann even uses 10nF to couple the rear and front membranes in the U67!)
There is a solution for every problem!

http://www.vansteenisaudio.nl


 

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