Next Power Amplifier based on Sony Esprit Series Using No Negative Feedback Architecture

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

I used a lot of SMD components, all with 1206 dimension

Soon I'll show the complete work

100W Mosfet Amplifier Project STK3102III 2SK1058 2SJ162

Mosfet Amplifier Project.

Components:

Amplifier Module Driver           STK3102III           Sanyo
Lateral Audio Power Mosfet    2SK1058 2SJ1062 HITACHI

Output Power Stage

STK3102III Stage

Download Full Schematic:


STK3102III Amplifier PDF

Sony TA-F770ES ES Series MOSFET Amplifier 100W " MOS FET Power Stage" Toshiba 2SK1529 2Sj200

SONY Integrated Stereo Amplifier TA-F770ES
F770ES
Spontaneous Twin Drive
Super Legato Linear
Gibraltar Chassis
MOS FET POWER STAGE

MOS FET Power Stage F770ES

Description....

Toshiba 2SJ200 and Drivers

Inside View

Specifications:

Hybrid Power Amplifier Using 12AX7 as Input Stage and VAS, 2SK1058 - 2SJ162 as Current Buffer

In this days I'm working around an Hybrid Power Amplifer
Below the Microcap Simulation Schematic

M2 and M2 are Hitachi 2SK1058 Mosfet
M3 and M4 are Hitachi 2SJ162 Mosfet

Bias current is around 100mA

V1 and V5 are High Voltage Supply, around 300Vdc
V3 and V4 are 50Vc for Power Stage

X4 is TL071 Op Amp used to fix to 0Vdc the ampli's voltage offset.

The Negative Feedback Network is present

X3 is a SRPP as Input Stage
X1-X2 are used as VAS and to drive the Power Mos Stage

Mosfet Amplifier 100W Example Schematic: AB class Principle Diagram

The Following Schematic is an Example about Easy Implementation of Mosfet Power Amplifier.
Power Supply is not regulated.
AB class operating.
100W could be obtained in 8ohm load.
Mosfet 2SK1058 2SJ162.Mosfet Amplifier Example Schematic

Mosfet Amplifier Schematic Example

Dowload PDF schematic document:

Mosfet Amplifier Example Schematic

HTA: Hitachi Top Mosfet Amplifier 100W Project Using 2SK1058 2SJ162

 Hitachi Top Mosfet Amplifier Project

All Semiconductors, BJT - Mosfet.
Only Schematic.

Download Mosfet Amplifier Schematic pdf

Description:
HTA: Hitachi Top Amplifier
B Class Mosfet Power Amplifier, using Hitachi's Mosfets 2SK1058-2SJ162.
Input differential stage and VAS stage are like Sony's ES 90's  amplifer.
VAS is Cascode Configuration.
Output Stage use 4 devices, 2 N channel MOS and 2 P channel MOS, note the power voltage rail is NOT regulated, the signal voltage should be... anyway they must be separated.

100W Continuos Power into 8 ohm could be obtained with appropriate Power Supply

Hitachi's Mosfet Amplifier Project