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

Complete Preamplifier DIY Line Amp, RIAA EQ. Moving Magnet MM. Moving Coil MC

Complete Preamplifier DIY  Line Amp, 

RIAA EQ.

 Moving Magnet MM

 Moving Coil MC

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

Sony TA F80 ; Power Amplifier 120 + 120W, PLPS Power Supply, Restoration Project pt.II

 Amplifier Sony TA-F80 :

Sony TA-F80 

Sony's Knobs after clean

 TA-F80 power board with Heat Pipe and power BJT,  NEC 2SC2681 instead Sony 2SC2571 from factory..

Sony Power Board Before Restoration

Input and EQ Control Boards

Sony Japan RIAA - UNIT 

 Pulse Loked Power Supply PLPS:

TA-F80 Amplifier  Inside

Sony PS-X60 Direct Drive Turntable with Denon DL-103 MC Cartridge

Sony almost top turntable PS-X60 as substitute of my Techincs SL-1410

My New Sony Turntable

Sony PS  X 60 Direct Drive Turntable

It only needed the tonearm lift adjustment

Added to Sony Tonearm PUA-7 my MC cartridge: Denon DL-103

Sony PS-X60 - PUA-7 and  Denon DL-103

Beautifull Tonearm Sony PUA-7

Big Sony Made in  Japan Platter

Look inside big Sony PS X 60:

Inside:  Electronic Boards, Motor, Power Transformer