X-SOZ-X-BOSOZ.....choke loaded

[Magura]

This have to be the way to go.

The X topology likes to have more than one gainstage, i dont...but by combining the X-SOZ with X-BOSOZ we would get 2 gainstages and remain with the X-SOZ as we like it.

To top off things, the efficiency should be boosted a bit, that would be done best by making the whole thing choke loaded (I guess).

Variac....there you go

Any ideas??

Magura

[woody]

I have started playing with this a little bit. Today I built the SOX
as per FIGURE 4 SUPERSYMMETRICAL SON OF ZEN . I then replaced the drain resistors with 5 mh air core inductors I was thinking along the lines of a tweeter amp I thaught 5mh might
do. Next I will try replacing the source resistor with a ccs to get
the effency higher. Thank you again mr Pass for the wonderful
articles.

Woody

[Variac]

OBoy!

We may disagree if the choke replaces the bunch of power resistors I have bought along with their heatsinks at great expense.


But here is my wishlist/ manifesto which is probably common to
are our needs:

1. The X topology likes to have more than one gainstage
2. The SOX may be one stage, but it's gain is low enough that it needs to be used with a pre-amp
3. So, why use a separate preamp when you could combine the preamp as one stage and the SOX as the second stage.

4. THEN you still have the same number of gainstages BUT you get the greater benefits of a 2 stage X circuit.

5. FINALLY THE BIG QUESTION:

I assume that to get the greatest benefits of two x-stages they need to be connected more like an Aleph X, Or, do you get the benifits by just hooking a BSOZ to a SOX with interconnects?

Can someone tell me what the circuit will look like?

I can't see how people like Henrik, Stefano, Grey, Grataku, Mad K can resist this.....

[Magura]

Could this be the right approach?

Magura

[stefanobilliani]

Originally posted by Variac

I can't see how people like Henrik, Stefano, Grey, Grataku, Mad K can resist this.....

Resist???? Just don't know how !

1. The X topology likes to have more than one gainstage

who said that? I learned that X is good to let do a single stage (or two stages) amp what usually 6-10 stage amps do in terms of power , damping , BUT with (if I know ....) MORE life in reproduction .

2. The SOX may be one stage, but it's gain is low enough that it needs to be used with a pre-amp

SOZ needs a preamp too, and its gain is the same of SOX .
Of coure the input impedance is decreased but you can play well with BOSOZ.

OBoy!
Can someone tell me what the circuit will look like?

I would try a little effort in the SOX rather than add a second stage : CASCODE
not folded but just interposing devices between the drain resistors and the drains. I just love it !!!!

[Variac]

Who said that?

Nelson Pass:

a single stage circuit such as the SOZ would not actually be expected to see as much improvement as a two stage circuit because by its very nature it does not correct for the non-linearities in output curent caused by the Gate to Source non-linearities of the differential pair themselves. This is a fundamental limitation, and of course is true of differential pairs in general

SOZ needs a preamp too, and its gain is the same of SOX .

Yes this is true. They both need a preamp so why not make them 2 stage but without a preamp?

Of course the input impedance is decreased but you can play well with BOSOZ.

But if you are making a special XBOSOZ that works best only with a SOZ or SOX , why not integrate them?



Maybe it's true- is what I want an Aleph X with resistors (or chokes) instead of constant current sources and a differential pair per channel? can this be done?I'm lookin' at the two schematics but it suddenly occurs to me that I know almost nothing about circuits!!! My head is spinnin'

So can we :

correct for the non-linearities in output current caused by the Gate to Source non-linearities of the differential pair themselves

Mark

[stefanobilliani]

Well : the non intuitive character of SuperSymmetry(TM) is back again, and it is welcome of course .

[Mad_K]

Variac, I think you are overthinking this. Just build your SOX (and X/BZLS) and stay happy ever-after. I promise you; once you hear that transistor clapping, you'll forget everything else


(And maybe when * arrives, you can start thinking a little bit again )



*=little green tweak monster

[Nelson Pass]

Originally posted by Variac
Yes this is true. They both need a preamp so why not make them 2 stage but without a preamp? But if you are making a special XBOSOZ that works best only with a SOZ or SOX , why not integrate them?

A SOZ and SOX cascaded could look a lot like an Aleph X whose
output is biased by resistors, so integration is a snap.

Some people need the gain, but given the low power, some
don't. I like to directly use the output of my Wadia, which has
just enough poop to do it with efficient speakers.

The next iteration of X-SOZ (ZV7) will use a current source for
bias and a choke load.

[Variac]

A SOZ and SOX cascaded could look a lot like an Aleph X whose output is biased by resistors

OK, there you go guys, I want this on my desk by this time tomorrow!!!!!!



Mark