Hi, I look the Pioneer A-09 Amplifier, and I read a "High Speed BIAS servocontrol". This is an old topology, or may be can we use this?
Another amplifier use the same circuit?
I found in a vintage amplifier a lot of circuit use to reduce distortion, high speed, double feedback, dynamic PSU, class AA+, non feedback, ... but today, I see in amplifiers of the same companies (Yamaha, Onkyo, Pioneer,...), the classic 3-stage amplifier. Why? Those circuit are obsolete?
Another amplifier use the same circuit?
I found in a vintage amplifier a lot of circuit use to reduce distortion, high speed, double feedback, dynamic PSU, class AA+, non feedback, ... but today, I see in amplifiers of the same companies (Yamaha, Onkyo, Pioneer,...), the classic 3-stage amplifier. Why? Those circuit are obsolete?
