My Collections of Vintage Audio Gear

Just showing pictures to remember and documented my vintage audio gear. The gear is integrated  amplifiers and CD Players, also speakers but i still find the picture in my computer. All item i got from flea market execpt speaker that i got from friend on Bandung.

This is SANSUI AU-555A 

Sansui AU-555A

Inside view of AU-555A

Bottom view AU-555A

Sansui AU-5500, next time i will update with inside parts

CD Player Philips CD880, original made in Belgium, good build quality and rare.

Philips CD880

Inside of CD880 with high quality parts

Closer Look at DAC chip, using TDA1541A Single Crown (S1)

Identify Good-Original Capacitors

       Long time ago i have mind to help people with a simple drawing that contain of typical / physical identity some big-original manufactures of capacitor. Currently i added six of them, that usually find on global market today and usually other "fake manufactured" hijacking design. This is quick drawing for guidance to pick good capacitors. Please do some search of data sheet capacitors on internet if you want make sure that capacitors is original, sometimes you can't find datasheet because of out off productions (too old), or missing datasheet from their sites. In this drawing include : Panasonic / Matshusita, Rubycon, Sanyo, ELNA, nichicon, Nippon Chemicon (UCC/NCC).

identify top-bottom section of capacitors
(Click for Larger picture)

Please inform me by leaving comment, then i will update periodically if i found some good information.

Worth Modification QLS-350 a Big Leap in DAP

This morning, my friend give order to me to modification his digital audio player (DAP) called QLS-350 from QLS HiFi. This player only support WAV file format, with good spesification like :

-Digital output chip: CS8406.
-DAC Chip: Wolfson WM8740.
-LVP: AD8656.
-Headphone Amp chip: MAX9722A.
-Battery Type: 7.4V Li-Po battery of Model General Specifications, maximum size: 55mm * 31mm * 16mm; the capacity is  usually among 800-1100mAH.
-Use 2PPM  11.2896 TCXO  Crystal (crystal JITTER is below 10PS)
-The power supply part use several LDO, respectively offer power for: crystal oscillator, the main chip, the digital output chip, DAC digital, DAC analog, headphone amplifier, display control, to ensure the best sound quality.
-In portable system, fever grade materials are applied: Kemet tantalum capacitors, YAGEO SMD 1% precision resistors, high precision SMD capacitor of Samsung, ELNA electrolytic capacitors, ALPS potentiometer.

Some people have done modification too with their self preference, i not gonna mad to totally mod, until change the original case, this is just simple mod, yes! only recaping few of capacitors with my caps in drawer.

Here is the places that i gonna mod :

 Closer look below at modification field, capacitor that i colored is Elna Silmic II with 16v voltage each.

QLS pcb closer look

With parts above i replace capacitor in colored shading, replaced Elna Silmic II 10uF/16v on signal input path with Wima 1,5uF/50v i think is enough small and reliable price in position. 4,7 uF/16v i replaced with Silmic II 10uF/50v little bigger in that place, Silmic II 47uF/16v with Panasonic FC 100uF/35v, in the end place bypass capacitor on Panasonic FC 1000uF/25v legs. I not replace this one with Panasonic  HFQ 3300/16v because the hole is tight, and the size is longer than original. I use cardas solder that make sure perfect joint and have good clarity.

The result is very good, reveal the hidden detail, more clarity, separation very good..... a worthful mod of QLS-350.