Summit Audio TD-100 Instrument Preamplifier and D.I. - Manual (Page 11)

Model TD-100 Tube Direct Box 11
Electrical Connections
Electrical
Connections
Input
Unbalanced 1/4” jack
Sleeve - - Ground
Tip - - - - (+) Signal
Output
Balanced 1/4” jack Balanced 3-pin XLR
Sleeve - - Ground Pin 1 - - Ground
Tip - - - - (+) Signal Pin 2 - - (+) Signal
Ring - - - -(-) Signal Pin 3 - - (-) Signal