Yamaha Music Centre - The Yamaha MG10XU is a 10 channel mixer with USB and SPX digital effects with studio-grade discrete class-A D PRE amps with an inverted Darlington circuit providing, natural-sounding
MGP Series - Features - Mixers - Professional Audio - Products - Yamaha - United States
Darlington Transistor and the Sziklai Darlington Pair
MG Series - Features - Mixers - Professional Audio - Products - Yamaha - UK and Ireland
Yamaha MGP24X 24-Channel Mixer
NON-NFB AMPLIFIER
operational amplifier - Way to show that the current through a Darlington pair is determined by the emitter resistor - Electrical Engineering Stack Exchange