iD73 is a microphone preamplifier. It was inspired by a popular vintage British class-A mic preamplifier. Unlike the original preamp iD73 has a single microphone input only which makes this module more affordable than its «older brother» iD73+. However, if you don't need a line input, iD73 will be a great addition to your preamp palette. iD73 has a DI input as well. DI is located before the input microphone transformer.
There are additional options for microphone input: "PAD" (reduces the input signal by 20dB) and "LoZ" (this lowers input impedance which leads to input level increase and may change the tone a bit). There is an output level control ("TRIM") and a polarity switch.