Sony DTC-1000ES Digital Audio Tape DAT with Sony CX20018 ADC and Philips TDA1541A DAC inside

Sony DTC-1000ES DAT Player

Not Working, but very beautifull Player!
Elna Audiograde Capacitors.
Philips TDA1541A - SAA7220P/B Chipset for DAC
Sony CX20018 for ADC

Sony CX20018 ADC 

Philips TDA1541A

To restore and repair.....

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 

My Personal GY50 Hybrid Amplifier 50W 8 ohm

My Personal Copy of Famous Aloia Hibrid Amplifier GY50. Amplificatore GY50 .

Amplifier using Vacuum Tube, ECC83/12AX7, for VAS Stage and Triple Stage of Emitter Follower in the Output Power Stage.
Power Output Devices; Toshiba 2SC3281 2SA1302.
All Regulated Power Supply.
No Overall Negative Feedback.
50W/8ohm, THD<1%
Made by Altium Design / Protel  CAD Database


Schematics:

Regulated Power Supply of  Power Stage

Output Power Stage Triple Emitter Follower

Vacuum Tube VAS Stage

Vacuum Tube Power Supply 

Amplifier and Power Supply  PCB , Printed Circuit Boards:

Power Output Stage, Output devices 2SC3281-2SA1302

Signal VAS Prited Circuit Board 12AX7/ECC83

Signal Stage Power Supply

Current Buffer Regulated Power Supply

Sony Class A Amplifier TA-N86B Pre Esprit Repair Restoration Servicing

Presents:

Sony Pre Esprit TA-N86B Class A , B, BTL Amplifier 
Repair & Restoration

Sony TA-N86B After Restoration

Serial n° 501037

First Ceck...

First Failure Found, Sony's BJT 2SC2398...!

Second Failure 2SA706

PLPS Bridge BJT, 2SC2023  the Third

Complete view of failures, Sony, Sanken:

Japanes  BJT , faulty components

Repair made by using original components from ... a  TA-N86B doner.

After Repair service all  Capacitors Replaced by ELNA SILMIC II Audiograde Components 

All Sony BJT in Output Stage, All NEW Capacitors ELNA Silmic II

TA-N86B Specs:

To be continued....

Not Working Cassette Deck AIWA AD F660 Repair

Not Working Cassette Deck AIWA Repair.

3 heads, 2 motors (1 for capstains, 1 for reels)
Closed loop dual cpastan, Dolby B, C HX Pro, Bias adjustable. 
ADMS Automatic DeMagnetizing System

Trouble: In Play Mode Capstan Correctly Work but tape go out, Reels don't go

Repair: Not mechanical problem, but electrical, in Power Supply zone; a lot of defective soldering joint!

AIWA AD-F660 Not Working

AIWA DX R&P Heads , Dual Capstan

AIWA Mechanical Detail Dual Capstan Big Motor

Bottom Layer, Power Supply Zone

Defekt