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Old 7th January 2003, 02:56 PM   #1
protos is offline protos  Greece
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Default Is this just another BOSOZ?

A new addition to the household for 2003.
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Old 7th January 2003, 02:59 PM   #2
protos is offline protos  Greece
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And the centerfold fully undressed picture for you naughty members !
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Old 7th January 2003, 03:06 PM   #3
grataku is offline grataku  United States
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Yep, it pretty much is. Very nice job!
I have to change one of the pots in my BOSOZ so one of this days I'll post pictures and give you a chance to take shots at my version.
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Old 7th January 2003, 04:07 PM   #4
protos is offline protos  Greece
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In terms of "audiophile" components this is what I used:
1) Overated trafos at 2x120VA instead of 2x60VA
2)Ultra fast soft recovery diodes for rectification (IRF)
3)Aerovox and Black Gate caps for the power supply boards.
4)Sikorel 2200uF caps under the main PCB
5)Holco non-magnetic resistors
6)Dedshete damping sheets to minimise chassis ringing and decouple PCB's
7)Silver-plated hook-up wire from Audio-note.
8)DACT gold plated stepped attenuator and selector switch.

Further mods may include replacing film coupling caps with Black Gate BG N non-polar as advised by Peter Qvortrup of Audio-note.
Perhaps bypassing Sikorel caps with film and film+foil caps.

Now to the sound of this sexy little bride of my Aleph 5's.
At first I only heard it unbalanced in and out for a few days.Compared to my passive set-up which is very transparent I didn't notice any loss of transparency which is quite a feat if you think how many more connections and active parts the signal goes through. There was a much more powerful dynamic sound especially in the bass which was what I was hoping for. Of course pace and timing were also much better.However with all the extra dynamics and punch there was a subliminal residual feeling of a bit of hardness on some recordings around the midrange. I didn't know if this was because my passive set-up was softening the recordings and that the BOSOZ was showing more of the deficiencies of some recordings or that it was adding something of it's own.
Then one day I wired up the balanced connection in the Alephs and switched on.
Well , with the first few seconds of music my jaw dropped, I started rubbing my eyes and pinching myself in case I was dreaming because I wasn't sure I was listening to the same system , much less the same pre-amp!
Well allright, maybe I am exaggerating a teeny bit but we are fanatics aren't we?
Seriously I thought that my speakers had "grown" much bigger even taking into account some small level differences. Everything was there but more of it. The soundstage expanded and deepened cosiderably, there was more space between instruments and the bass got even better!And on top of it all everything sounded more natural with that residual hardness completely gone.
In I am completely in love with balanced operation.Just to give you an idea I tried also balanced in from my TEAC VRDS-25 CDP and it actually sounded a bit better than my unbalanced Perpetual Technologies P3A-P1A-Monolithic PS which usually mops the floor with it. The Teac is clocked and op-amped but the P.T. combo is also op-amped with OPA627's and with soft recovery diodes and is generally regarded as close to state of the art for DAC's (as well as being almost twice as expensive as the CDP) I am annoyed now that I can't get balanced operation from it because it doesn't seem to be a dual differential circuit.
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Old 7th January 2003, 04:08 PM   #5
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Hello protos,

Nice layout.
I like the blue LED and your cone stands.
Try to make selector and volume pot knobs out of wood,
with little larger diameter, they will look even more awsome.

Why you did not use filter capacitors on the main PCB ?
The circuit will perform even better with them.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
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Old 7th January 2003, 04:14 PM   #6
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Hello,

Never mind for the capacitors.
I just saw them under the PCB.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
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Old 7th January 2003, 06:34 PM   #7
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Quote:
Originally posted by protos
Well allright, maybe I am exaggerating a teeny bit but we are fanatics aren't we?
Beautiful work! I love balanced operation too.
Sony's cd players offer often balanced operations before their unbal op amps
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Old 7th January 2003, 06:56 PM   #8
fcel is offline fcel  United States
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Default quote ".... and the bass got even better!"

I just wanted to say that I got the same experience in regards to the BASS - if connected in balanced mode.
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Old 7th January 2003, 07:10 PM   #9
PsykoK is offline PsykoK  France
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hi proto,
very very nice job, I love it!

I plan to build something so with my BOSOZ:
Click the image to open in full size.
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Old 7th January 2003, 10:02 PM   #10
moe29 is offline moe29  United States
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Protos!, verrry nice.
i like your use of wood for the face plate.

...the LED always has to be blue, doesn't it

m.
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