MP73a 500 Series Mic Preamp
1、Vintage style electronic, no integrated circuits in the signal path
2、Enough mic gain to handle passive ribbon mic with quiet sound sources
3、Switchable impedance on mic input, 1200ohm or 300ohm and phantom power with LED indicator
4、A flexible front panel instrument input for additional sound sources
5、Make fine gain adjustments and overload the main gain stage for more character
https://www.alctron-audio.com/EN/Amplifier/500-series/MP73a.html