-Connector XLR-3F
-Type Transformerless, NPN active balanced, tube second stage
-Input Z 2k ? nominal
-Maximum Input Level (MIL) +25dBu
-CMRR >70 dB @ 60 Hz
-Nominal Preamp Gain 20 to 65 dB
-Phantom Power +48VDC
-Pad 20dB
-EIN -127dBu (input shorted)
-Tube Type 12AT7/ECC81 Dual Triode . . .