Yamaha C-4 Preamplifier Input Knob Selector Repair

EL34 Triode Amplifier Single Ended 0 Feedback, 6SL7 e Mos driver & Phono MM input

Description: 
StereoTube power amplifier.
Tube complement: two 6SL7, two EL34.
Configuration: EL34 connected in Single Ended Triode
Output power: 7W
Frequency response: 10Hz–30kHz, ±0.2dB
Input sensitivity: 770mV for rated power. 
Rated load impedance: 4-8 ohms. 
Damping factor: 5 at 1000Hz due to 0 Feedback Design

EL34 SE Amplifier 6SL7

EL34 SE Amplifier 6SL7

Phono Stage  for EL34 SE Amplifier 6SL7

Phono Stage  for  EL34 SE Amplifier 6SL7

Phono Stage  power supply for EL34 SE Amplifier 6SL7

EL34 SE Amplifier 6SL7

Phono Stage  for  EL34 SE Amplifier 6SL7

EL34 SE Amplifier 6SL7 inside

Stereo Tube Preamplifier SRPP E88CCE88CC JJ-Tesla DIY project

Tube Preamplifier E88CC SRPP

E88CC SRPP

E88CC SRPP

Sony CDP-X7ESD CD Player restoration KSS-190AFailure DIY Repair Fix

High End CD Palyer, Sony ES series, CDP-X7ESD with broken Optical Group KSS-190A

No Focus and No Tracking Lent's movement on CD insertion.

I found the flat cable broken.

Some pictures about my  work:

KSS-190A

KSS-190A  Broken Kapton Flat Cable on 90° corner 

KSS-190A

KSS-190A

KSS-190A

Workig CD Player

11

Sony TA N902 N900 N901 Esprit Solid State Class A Amplifier Clone II Switching Dual Power Supply

DIY 
My Sony Esprit Clone Power Amplifier!

Power Boards Hetasink

Switching power supply

Sony TA N 902 Esprit Solid State Class A Amplifier Clone

Sony Esprit TA-N902 Power Amplifier:

My design about Sony's clone, power part simulation: 

Hi Fi power supply +60V 0 -60V DC

A Linear Power Supply designed for Hi Fi appliance capable of +60Vdc,-60Vdc, power diveces cuold be IRFP240 IRFP9240

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

Vox AC30 AC30/6 TB Guitar Tube Combo Amplifier Repair

EL84 Guitar amplifier new release

New release of our 18W Guitar amplifier, Made in double layer proponete circuit board.

3 x 12AX7 

2 x EL84

Selectable Marshall style  or Fender like tone stacks 

EL84 and 12AX7 on PCB