Monday, December 24, 2018

The Shure SM58 Mexico capsule impedance and Pleiades mod


The capsule was not disconnected.


The impedance of the capsule in shunt with the primary of the internal mic step up transformer at 1.28KHz was measured approx 8Ω.


After unscrewing the relevant compartment in order to make the measurement inside was found a very little torrid (sea blue color ferrite made by Siemens Epcos) which had been disconnected.


It is a very early example of a Pleiadss high pass filter. Only 23 turns of wirewrap wire were wound and the inductance is only 1.14mH. So it is deep high pass. The mic had recorded a very nice female voice singing at 1in from the mic an a capella cover of the following song recorded directly to Sony TC-D5 Pro mono bridged. Some s problems on male voice.


This is the original song possibly recorded with AKG D25 on electron tube custom made console by Mikes Psalidas feeding a Revox electron tube reel to reel:


Γαϊδαράκος - Hatzidakis, Vougiouklaki


https://m.youtube.com/watch?v=OX7Q5JGXKqE


http://www.audioschematics.dk/downloads/manuals/microphones/akg%20d%2025%20b_d%2020%20b.gif







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