Elegant design concepts & high fidelity audio

poniedziałek, 19 listopada 2012

1st gen SONY CDP - Super Direct Sound mod -

Finally Eryk S got Facebooked > Eryk S Concept on FB

Dear All,
interested in boosting top sound from SONY CDP 101, 501, 701 heavy duty machines!

I would like to share my knowledge, concerning super-vast sound updating issue in 1st gen Sony CDPs. By saying "vast" I mean leveling this already nice sound to fulfill high expectations.

As one of those feeling that hi quality in material, robust build, engineering has inevitably gone in 1990 I had focused on the equipment built mostly during 70-80ties.Sony's concepts during those years should be judged as pure hi-endish and cutting edge ones. As for their first CDPs: 101 and 501/701 released on the market in 1983-84, there was no such company using so advanced technology. For example in Yamaha CD-1 top unit you can spot all DAC boards taken from Sony.Of course on the other side appeared Philips, but in my very subjective opinion the look and touch'n'feel aspect of their equipment did not match Sony's at all.

Again back to the point - First gen CDPs are using almost the same DAC topology: superb CX980 mono pro-dac or later double dac CX20017 DAC > I/V converter > amp stage > analog LPF > 2V output amp stage again. These dacs represent also one pleasant approach from diy perspective - they need external descrete parts to stay complementary. This enables you to feed them with top modern parts now.
Second, sample hold / buffer stage used there is made of good quality HF/LF357 double op-amp - good, but today we can go much further with it!
Third, passive Low Pass Filter (in those CDPs silver cans - see photo below) also consists of op-amps and RC on smd boards -six in quantity - horror! Last stage is also op-amp made with advanced feedback loops.

So even on this very short digital to analog part we see much engineering and complexity. We have 7 op-amps in total for one channel! This might give good measurements, but sonically you get rather mimicked sound from the original one...Quite a bit of a drama...

Tube outputs are becoming more common day by day in our cd players, but I myself do not approve tearing the guts of a  good old cd just to push rarely optimal parts in it. I often prefer simple and max effective path, so such thinking went here - do not ruin this good old fellow, just let him finally open his hidden capabilities!

As you can see from the factory drawing I just simply skipped two last stages: LPF and buffer and changed the first buffer/sample holder to top notch AD797 amp, which here works exactly as I/V converter and voltage amp. It's output is directly connected via decoupling cap already used in those CDs before chinch outlets - it is totally enough to extra bypass it with some good mini 50V polypropylene or bipolar 10-22uF capacitor.

And that's all folks!
Few people asked about the sonic artifacts, which could appear due to the lack of low pass filter, but I have not heard to many of them. This Eryk S direct mod I've applied in few such CDPs, playing them with more then few amplifiers and always with great sonic results.

Pls feel free to try it and report your findings :)


sobota, 10 listopada 2012

The Hipster's Hi Fi music set

Finally Eryk S got Facebooked > Eryk S Concept on FB

So this is what you need to stay trendy and at the same time be regarded as an open minded person.

You have to mix:
- eco,
- classic old-school,
- hi-tech innovatio
with some tasty style appearance to present final solution to your friends.

And here it goes, the Eryk S recipe:

- steal some old classic LP's from your daddy and collect some new ones to impress others with your music taste
 - buy vintage Sony's PS-Q direct drive, fully automatic turntable, from first Star Wars era. (This mini one already has built-in phono preamplifier).
 - order one of the newest discovery in true digital sound amplification - pocket size DIGIAMP capable of putting out 30Watts per channel with unbelievable quality. Austere champagne look and solid alu finish + Eryk S mods will help you to yeld permanent banana face!
- e-mail for MINECO super fullrange loudspeakers to get plenty of music and still plenty of room space

Paypal is also accepted if you would like to arrange similar set with my help.


Eryk S Mineco speakers

Finally Eryk S got Facebooked > Eryk S Concept on FB

Don't they resamble IKEA or japan style?
Scandinavian eco modesty and ergonomic approach plus japan inspired Eryk S logo, all this engraved with hi-tech solutions developed in PL.

Don't be fooled by the small look, because Mineco uses top-tech fullrange driver available today, which covers whole 45Hz-20kHz music area with minimum linear distortions. The 30Watts of power handling capability and 87dB efficiency should be more then one can imagine from a box of 11x28x28cm size. The speaker's membrane is made from japan cellulose, weighting only 1 gram - you receive super fast response that way. Every detail hidden in the flow of music is fully rendered and served with loud impact if desired.

The MINECO is a rear bass-reflex design.
Its cabinet has been additionally dampened with special felt & bitumen mats.

The MINECO is Mini & Eco design, raw plywood cabinet super tuned with holographic sounding widebander. As an extra option this plywood can be also printed with whatever graphic you like - imagine this!

Do send me a message if you want a pair: eryk@eryksc.com


Tubeco amp - the Dexter's syndrome

Finally Eryk S got Facebooked > Eryk S Concept on FB

First, you have to pick a bottle of wine packed in a nice wooden box.
Second, you try to drink the whole wine with...choose your best way.
Third, you Do Your Concept - D.Y.C. - for sure not immediately after parting with wine, when the deathly risk of electric shock seems not to be a matter of great concern.

This is Single Ended amplifier design, meaning one tube pulls all the signal per channel. The bigger bottle present on the front works as preamplifing stage. I went for the most powerful tubes as for their small size. They were made in USSR - military version 6P14P-EV pentode (14Watts of anode dissipation power) and in pre 6SN7GTB double triode, mostly desired by music fans and still produced today.

The Tubeco's circuit is as simple as it gets. Applied here is a point to point connection, great for easy tweaks, when you have permanent Dexter syndrome.

All you have to do is to connect the source and the speakers, power on and adjust the volume, ENJOY.