Studio condenser microphone, the first to incorporate a field-effect transistor (FET) instead of a vacuum tube. What made this mic more versatile was its power source, a 9-volt stacked cell (006P) originally developed for radios. Offering outstanding balance, the C-38 was designed to support a wide range of sound sources. Starting with this mic and continuing in the C-38B, the series set the standard for professional use as a trusted resource in recording.