Used for vocals, as mentioned in this article from philsbook.com.
A Neumann U67 was used for the vocal and placed close to the singer's mouth. The guitar was close mic'ed in front of the sound hole using a Neumann KM56.
The mics went through the Sound Techniques desk to an Ampex 4-track half inch tape machine. The desk circuits were transformer coupled, discrete transistor with inductor based eq. The vocal was compressed through a Fairchild 660 limiter. Delay would be added using an Ampex 2 track and reverberation with an EMT plate.