Wiring of vintage Shure mics: 3 or 4 pin Amphenol to XLRFAQ #1725
Check out the discontinued product sheets at: User Guides and Spec Sheets
Using the information on these sheets, wire to the 3 pin XLR as follows:
XLR pin 1 = shield, Amphenol pin 1
XLR pin 2 = low impedance audio hot (Amphenol pin 4, white wire, typically)
XLR pin 3 = low impedance audio return (Amphenol pin 3, black wire, typically)
Note: On the four pin Amphenol, pin 2 is a high impedance, unbalanced output.
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Also, search this online Find An Answer database using the word "amphenol."