I'm traying to make an amplifier following example of Sony TA-N902 Esprit Sere, the last aftre TA-N900 mono and TA-N901 stereo.
Sony's Esprit amplifier all haven't Negative Feedback, they had a Voltage Amplifier Stage made by discrete components, which has his proprer feedback and a current stage located out the loop, This architecture decrease the TIM distortion. To minimize THD Sony used his own patent concerning non-switching power devices, the stage also remain a AB class but results similar to pure class A.
|3D of the Voltage Amplifiere Stage|
Some amplifier are been used as example for schematic or as components donor.
Power supply is from a PLPS from an old TA-F80,electronic components for VAS are coming from a TA-F500, the chassis is given by a broken Behringer A500.
Other components are new and PCB are made by myself.
|Current Amplifier 3D|
Soon I'll show the complete work