Auna AV2-CD508BT Hi Fi Amplifier to High End Preamplifier AUX bluetooth

How to made an economic High End Preamplifier.

My Auna CD508 project: from Hi Fi power amplifier to High End Preamplifier with Phono MM and MC.
The original amplifier has a switching power supply, the input selector is made by CD4052 and power amplifier is made by Texas Instruments AB class IC, LM1875 in bridge connection. The power rails voltage are +16/0/-16 Vdc and it as some features like tone control, BT connection balance, remote control , motorized volume knob, output relay, 3 inputs(4 with BT) , a tape recording output and a headphones out.
Estimated  power output on 8ohm should be around 50W/CH.

Amplifier Auna AV2-CD508BT before mod

I dismounted the power amplifier section and I made a substitution with my Espritaudio Preamplifier modules: ESPRE

Preamplifier Auna AV2-CD508BT after mod

Bridge connection of LM1875

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

Vox AC30 AC30/6 TB Guitar Tube Combo Amplifier Repair

Ampeg SVT3 Pro Tube & Mosfet Electric Bass Amplifier - Bias Adj and Repair

Soundmachines Modular Mind Control at MusikMesse Frankfurt 2015

musikmesse 2015

Frankfurt

soundmachines

shows 
the Modular Mind Control

Link to

soundmachines

made in Italy

My Personal GY50 Hardware Project Development PCB

My GY50
Made in August 2004 on Aloia's Project

Current Amplifier Output Power Stage:

VAS stage 12AX7 - ECC83:

Sony PS-X65 DD Turntable Repaired Restored

Sony PS-X65, trouble of drop point solved.
IC103 defective, once replaced the turntable plays well!!

Signals on pin 1 and 4 weren't correct, Luckily t was only the 4069 IC...

Faulty Component, datacode 79 48

My replacement..NOS MC14069UB datacode 80 36

Sony PS-X65 DD Turntable Quartz X TAL-LOCK System Full Electronic Microprocessor Controlled Magnetic Tracking

My New entry, not working, turntable Sony PS-X65 substitue of other Sony Direct Drive Turntable

 Sony PS-X60. Only better S/N ratio for the specs, but it has more charm.

Speed is correct and Locked, both 33 1/3 and 45 rpm, in manual play it's perfect only a little trouble on the mute switch, easily solved.

In automatic play tonearm doesn't stop and doesn't retun to stop position...

Quartz X TAL-LOCK SYSTEM

It Spinning well!

It look so beautifull..

Automatic actions are guarantee by 2  electronic controlled motors, no mechanicals devices like his predecessor, PS-X60.
The Horizontal motor is used also for the correct Traking Force

There are 2 coaxial "brushless" motors: one for the lift the other,
you can see the coils, for the Horizontal Movement