Aleph P1.7 vs. XCCS Balanced Zen LS

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tomchaoda

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Joined 2003
#1
I have made one Balanced Zen LS and I am thinking of making a better pre-amp (even though BZLS is already very good). I am wondering if anyone have tried Aleph P 1.7 and/or XCCS Balanced Zen? Any suggestion which one might be a better one?

(also, if anyone had tried KRISTIJAN KLJUCARIC's board on both Aleph P or XCCS BZLS? How are they?)

Thanks,

Thomas
 
#2
tomchaoda,

I have made a CCS-X-BOSOZ with ProtoBoards

Very good impressions, output on a A75 balanced and on a Zen V4 unbalanced
and unbalanced inputs with a NAD C541 HDCD, see the link:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=29739&perpage=15&pagenumber=1

This version has only one CCS {Irf610}. It was a prototype, since I have made a new final one with 1 Pcb's for each channel... pictures comming soon...

If you are interested in the schematic, feel free to ask.

Regards.

Alain.
 

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  • ccs-x-bosoz2.jpg
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#6
Tomchoada,

No, not the same, this one has only one CCS, and an adjustable -10/-15 volts
negative supply, to be able to adjust the bias in the 2 IRF610 at the same time...

So you get the best of all worlds:

- adjustable bias
- CCS
- X
- BOSOZ

The last version of the schematic, v2...

Best regards,

Alain.
 

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  • ccs x_bosoz3.jpg
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#7
Tom I just recieved Kristjan Kljucaric's Aleph P v1.7 boards (Main Preamplifier and Power Supply board) and they are beautifully made boards. They are amoung the best I have seen. I am in the middle of gathering parts and so far have purchased Holco H8 resistors, Black Gate N for the coupling capacitors, Nichicon for the filter capacitors, Cardas RCA and Vampire XLR connectors, Corcom RFI/EMI Filter, Par Metal case and a Plitron toridal transformer. There are better parts available, but these are the best I can afford. Those who have built the Aleph P v1.7 rave about it. I just hope my version can measure up.
 
#9
Alain:

I once saw in one of the diyaudio threads that mentioned XCCS-BOSOZ, in his opinion, is better than Aleph P 1.7 (but I can not find it now!). How's your impression of the sound in your design?

Also, the original BOSOZ, Nelson suggest to put the VR on the output side. In your design it is on the Input. Is this a intended design or simply pick one choice?

Thomas
 
#10
tomchaoda,

Well, I did not listen to a Aleph 1.7 yet...
But had the chance to listen to the PassLabs X1, and that's a preamplifier!!

For the CCS-X-BOSOZ the sound is detailed, open, airy, a lot of dynamics.

I can compare it to the preamp of the NAD C350, which is a class A
but muddy, less dynamics, lack of transparency.

The VR on the output is missing from the schematic, I used a 10K 32 positions to short the outputs right at the 750 Ohms resistors, you can see the wires
But it was tricky to adjust... and cliks all the way!!!

The KYC111 Stepped attenuator from China is a mess, Never Ever use such a product, noise for all the steps.

The only problem I have now, a lot of gain... !!!!

And I am preparing a 10 K stereo stepped attenuator with 2*7 relays
thats 128 positions ladder type for the input, but not finished at this time...

On the other side I have found a APOX kit to finish the prototype, be able to switch inputs, and adapt the Aleph 1.7 like output atenuator to my needs.

On the research for noise in volume switching, I have one idea to try a Wolfson WM8816

But I need to build the enclosures, and have so little time, and short nights...
And a ONO also in construction...

Best regards.

Alain.
 
#14
arold19,

Yes, Nelson said that the BOSOZ could be used for unbalanced to balanced operation,
I have tried it unbalanced to unbalanced with a Zen V4 also with good results.

The only thing you have to add is perhaps a switch at the input, see the A75 schematic for the unbalanced operation. And the outputs can be used just like that in unbalanced mode. The Output RCA connected to the + Out, the - out is not connected.

Regards.

Alain.
 
#16
xccs bosoz pcb

Hi! Alain have you make the pcb for your xccs bosoz?
Thanks in advance.


Alain Dupont said:
Tomchoada,

No, not the same, this one has only one CCS, and an adjustable -10/-15 volts
negative supply, to be able to adjust the bias in the 2 IRF610 at the same time...

So you get the best of all worlds:

- adjustable bias
- CCS
- X
- BOSOZ

The last version of the schematic, v2...

Best regards,

Alain.
Click to expand...
 
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