AV system by Andrea Ciuffoli - 1 jan. 2003

contact me for any problem or question: webmaster@audiodesignguide.com

Introduction

This isn't a classic audio video system ofcourse.

using the Sony products:

KV-32FX65

TV Color 16:9 Flat Display Trinitron Wega da 32"

Advanced 100 Hz Digital Plus
Ricezione Pal/Secam Est
NTSC Video In
Standard TV B, G, H, D/K
Audio Hifi Stereo 2x20 W + 1x30 W Subwoofer
Auto 16:9
3 Prese Scart
Ingresso RCA / S-Video frontale
Uscite RCA Audio
Uscita cuffie

DVP-NS705/S

Lettore DVD Video con Decoder incorporato, compatibile MP3

Riproduzione PAL/NTSC (Area 2)
Riproduzione DVD Video / DVD+RW / DVD-R/RW(Video Mode) / DVD-RW(VR) / SACD / SACD Multicanale / Video CD/ CD Audio / CD-R / CD-RW
Compatibile MP3 (MPEG1 Layer 3)
Convertitore Video D/A 10 Bit / 27 MHz
Decoder digitale integrato: Dolby Digital / Dolby ProLogic
Digital Cinema Sound (5 modalita)
Segnale audio digitale in uscita: Dolby Digital / DTS / MPEG
Convertitore D/A Audio a 192 KHz / 24 Bit
Uscita 5.1 (DD/SACD)
Uscita digitale ottica e coassiale
Uscita digitale 96 KHz / 24 Bit
Uscita A/V RCA e S-Video 4 pin miniDIN

Hi-end components

P17RE COAX/TVF (H825) Seas coaxial driver with magnetic shield

I am using a DACT stepper attenuator instead of the normal ALPS or NOBLE solution, because the the sound is clearer.

Golden Dragon 12AX7/ECC83 (page1 and page5)

Golden dragon 12AU7/ECC82 (page1 and page6)

About wire forget the teflon ! use only stranded tinned copper wire with pvc isulator and for loudspeakers the same.

A very good quality stranded tinned copper wire could be buy directly from E-Z-HOOK that carries an extensive line of fine stranded and extra flexible wire.

Toshiba and Motorola transistors:

Loudspeakers protection:

Toshiba TLP621 (RS omponents code 768-251)
Diode bridge IRF DF002M (RS components code 227-8429)
Transistor BD679 (RS components code 109-084)
Relè G2R (RS components code 365-0563)
Elna Capacitors (RS components code 215-5657 & 215-5742)

Design

6 channels amplifier

It is an hybrid amplifier with tube voltage/driver stage and transistor output stage.

Specifications:

Output power on 8 ohm about 50Watt
Input impedence 50KOhm
Feedback zero (0db)

Test results

All these tests has been generated with CLIO system by www.audiomatica.it

The following image is the snapped thd analisys with an input 0.3Vrms and 17Vrms on 4ohm loadspeaker at 1KHz.
You can see the perfect decay of the distortion spectrum at 2KHz and 3KHz.