Tatum records unplugged in a sound treated room, without activating the guitar pickup, with twin microphones fed into an dual-mic interface. This allows the natural sound of the guitar, wood and air of the room to come through.
Shure SM4 large-diaphragm condenser mic - this is the primary mic, faced just off the guitar sound hole.
Lewitt LCT 040 small-diaphragm condenser mic - this mic is placed towards the neck of the guitar and angled at the 12th fret.