The charging voltage applied to the capacitor/diaphragm of a condenser (capacitor) microphone.
"I want to preface my review with a little history. The 8 track tape that CVC transferred the music from to a CD was approximately 36 years old. The last time I remember playing it was around 1984. In the meantime, it remained packed in a box and was eventually placed in the “antic shelf”. I did try to play it one time but my 8 track player ..."