R/E/P Community

R/E/P => Bruno Putzeys (Designer) - Dave Hecht (Master Tech) => Topic started by: aaahnoor on February 04, 2015, 06:47:38 AM

Title: CHARACTER
Post by: aaahnoor on February 04, 2015, 06:47:38 AM
I presume the great interest this subject has generated on this forum is the desire to hear certain vintage mics without some of the character-changing circuit alterations that were engineered into them.

These changes were either added because of engineering principles that evolved with time (some may say, devolved) or because buyers of large quantities of a certain model requested these changes (f.ex. maximum mic gains at the German broadcast system.)

The underlying principle and associated audible issue with Negative Feedback (NFB) are this:

In order to control gain and distortion of an amplifier, a small portion of the output of the amp is fed back out of phase (negative) to the input of the amp. This, in theory, has no side effect: the gain is reduced, the undistorted headroom of the amp is increased, and the amp becomes quieter.