Using resistance wire for primary transformer winding?

The problem is that the metal used for resistance wire (nickel?) may not sound as good.


Why having a resistive primary winding on a microphone input transformer?


In order to create a gentle bass cut slope a resistance is needed in series with the inductance connected across a mic . See improved Pleiades filters.


It is not the same as having an R is series with the primary winding. Because we do not want to decrease what the primary winding gets. We want to decrease what the mic produces. Just putting an R is series with the primary winding will make the usually 6dB per octave slope but at a higher cutoff frequency.


Using an improved Pleiades filter and then connecting an input transformer is different and it works. Because the primary is connected across L in series with R.


So a distributed resistance is needed. Either resistance wire.


Or a very thin primary wire?


Or using an improved Pleiades filter (L in series with R) across the mic output connected to an ordinary transformer primary as usual.


A typical value of R for a 200-300Ω omnidirectional mic might be 140Ω. A lower value, half perhaps might be used for directional mics as we need to compensate for the proximity effect too in addition to Fletcher-Munson and voice effort curves.


See nearby posts on improved Pleiades filter connected to the Sennheiser MD211.