Wednesday, February 26, 2014

DAC Journey ES9018 SABRE DAC

After build several DAC, PCM 63 with tube stage, non oversampling AD1865, shunt regulated-tube stage, now *drum rolls* time for ES9018!
Actually I owned this PCB with embedded chip since last year, from www.diyinhk.com but I have no time to studying and to build this board until few month ago.
I installed with what I had in my drawer, china made SMD 1206 resistors, Murata X7R SMD capacitors, and -forgot the name- ferrite beads 2A 600 Ohm.

Main power supply using Sanken ultra fast recovery diode, RL3z which i have from friend, thanks mate!
First capacitor tank is Kendeil 22,000uF, regulator using LT1085 Adjustable, last capacitor using Silmic for AVCC and Oscon 1500uF SEPC for digital supply both delivered 5.3v
AVCC power supply using low impedance power supply-LED V ref-OPA620SG (obsolete, beautiful and glamourous look, very precisely)-now using BC560B as final transistor, will try ZTX550...
this AVCC will supply 3.45v for AVCC of ES9018
VDD supply regulated by LT1733 3.3v non adjustable, I'm using two, one for VDD of ES9018 and another for clock supply.

Clock now I'm using what I had, KDS 80 Mhz 3.3v already ordered Pletronics SMD CMOS Oscilator 100 Mhz 3.3v which is still on his journey to my door :)

I decided using V/I transformer out after spying Andrea Ciuffoli and experimenting with friend's ES using balance to unbalance transformer.
Look at he twin black tower on the back, that is what I will using. 10K+10K:10K forgot the current capability, but I'm sure that will never blown away, 65H at 20hz, thats what I remembered.

I planned using Arduino controller, which has several benefits, user can set parameters, and digital volume control. on the photo, there are Arduino compatible, 20x4 display, ALPS rotary encoder 30 steps with switch.

Still waiting the overkill c core transformer for power transformer, 8v 5a each rail is a little bit overkill maybe?
And also the 100Mhz clock itself.
and also SPDIF buffer
and also hardware working, i mean the real hardware! drilling aluminum chassis, make window for LCD etc.
Still a lot of work and fun to do in spare time...


FURUTECH FI-10 Rhodium AC IEC INLET

SALE ITEM:
6 pcs FURUTECH FI-10 Rhodium. new condition. 
The Furutech The FI-10R Rhodium played IEC Inlet employ nylon/fibre-glass housing and high-conductivity phosphor bronze base metal. The Furutech FI-10 is a significant upgrade for most components, as most stock inlets are made of nickel-plated brass with a PVC body.

When used in conjunction with the Furutech FI-25 series of IEC plugs on your power lead, you'll have a connection that has a very tight grip, in addition to great sound! This IEC inlet is simple to install, and does NOT require soldering. The wires are simply screwed into the inlet.

Specifications:
Accommodates wire diameters to 3.2mm (set-screw).
Dimensions: 50.9 (W) x 24.1mm (D) x 28.8mm (H).
Rated: 15A/250V.
Type: 2-pole+earth.
Rating: 15A 250V A.C.
Eutectic (low temperature) cast brass a (Alpha) Conductor.
Materials: Nylon/fibre-glass.


ASKING PRICE IDR 375,000 EACH


Final tweaks of WE437A-300B monoblock

hi y'all, long time no see eh?
My humble monoblocks burnt one of pair of 300B, the filament burnt because my power transformer has bigger current rating than fi of 300B, filament only need 1.2A and my power transformer can supply 5v up to 2A without drop! what a powerful-overkill power transformer...
Sometimes overkill can kill your tube also haha..
Normally, power transformer, named high cost, high quality such Tango, Hashimoto filament supply precisely 5v 1.2A which will drop a little voltage (4.8~4.9v with filament load)
The other problem, my main voltage higher than usual, between 225-228vac, which is in Indonesia normally below 220vac.
So this time is a change to replace tubes with another. journey of my humble monoblocks that gives me a big hole in my pocket.
My choice this time is still Full Music, but different type, Full Music 300 B/n (Mesh Plate) which glow beautifully in the dark. time to order tubes from wiwitubes.
The tubes arrived very safe, double boxed, padded everywhere, and comes quick, 4 days with EMS service to my door.
Mesh Plate 300B form Full Music gives different signature from Carbon Plate, lower bass, more powerful mids energy.
At first my ears don't like so much the high frequency area, a little bit muddy.
Changes the speakers wire solve the problem, now my speakers cable is QED Silver Anniversary XT,  the highs become more airy, balance mids and tighter bass.
for the sake of longer life 300b, i decided to put 0.22 ohm in each filament supply that will drop the voltage to precisely 5v, this one also functioned as soft start filament supply.

The last tweaks, I changed no name silver-cotton tubing signal input wires to be Mundorf silver-gold wire in teflon tube 30 cm, twisted only twice, telfon tube only for return (ground) wire only.
more detail in mid-high area.
This is very good wire, i made my interconnect with this wire also. twisted every 10 cm. a little bit long time to break in, bit once break in, it can beat 600$ US interconnect.

the last tweaks?? nooo i have change one more lahh, my friend gave me pair of Blackgate 100uF/100v, why not experimenting with WE437A cathode bypass capacitor :)
at first-as peoples said about blackgate before break in- muddy! how can holy grail, most expensive capacitor has that sound signature!
but after 10-20hours, the treble start singing, the highs not as sharp before, but more musical, I can hear the differences a lot, and more balance.
After 100hours, my smiles can show off all my teeth, this is what I want.
Powerful, deep bass, normal mids, airy high.
maybe this is the last tweak... maybe...