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Old 27th January 2003, 04:28 AM   #11
Nelson Pass is offline Nelson Pass  United States
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Ah yes, you need for the current from the Sources of the
two stages to feed each other, and yours are going off to

No matter. This is easily fixed, and besides, it's a pretty
swell looking circuit already!

pass/ - not every amplifier has to be X
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Old 27th January 2003, 04:52 AM   #12
Peter Daniel is offline Peter Daniel  Canada
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The drive from positive input should go to positive output, and on the schematic it goes to negative output. That's why the X is not visible, I guess.
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 27th January 2003, 05:06 AM   #13
jh6you is offline jh6you
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Your guessing is aligned with my guessing.

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Old 27th January 2003, 06:33 AM   #14
Henrik is offline Henrik  Denmark
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You still need a diffrential inputstage, otherwise you only have the ordinary NFB.
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Old 27th January 2003, 01:14 PM   #15
nobody special is offline nobody special  United States
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I agree with Henrik... you have to have the differential pair coupling to acheive the X feedback... otherwise it is only NFB.
Also, what is the point of building the circuit out of the zen? You have to add all the coupling capacitors. Isn't it better to have the Aleph split rails?
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Old 28th January 2003, 11:55 PM   #16
kristijan-k is offline kristijan-k  Croatia
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Thanks for the response.

The Zen-XA, like it's name say, is a combination of an ZEN-4 and
an X-Aleph amplifiers.

The Zen-XA is not very true X design in the current configuration.
If we make an X design, than the circuit would have little common with
the ZEN-4, and we again will get some sort of regular Aleph or X-Aleph.
Also, as we already have an Aleph-X, there is no point to make another
one, and as Mr.Pass said - not every amplifier has to be X

I used no split rails because I already had the transformer with the
single 25 V seccondary at the hand.

I tested the circuit and it is working great with the Balanced Line Stage.
It is also very quiet, the speakers are dead quiet.
The driving a 4 Ohm load is easy.
It sounds really good, but I can't tell more as I builted only one channel.
It seems that the bass is little tighter than on regular Zen-4.
After warm up, the offset is stable and it is easily adjusted.

Best regards,
Kristijan Kljucaric
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Old 29th January 2003, 12:41 AM   #17
BrianGT is offline BrianGT  United States
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Originally posted by kristijan-k
The Zen-XA is not very true X design in the current configuration.
Why don't you call it Zen-A then?

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