Wayne is Wayne, you can't tease Wayne - one day you might need him ....... so best to avoid Reds too
so use whatever color you like , except Blue and Red
you can even use Green ones, even if they are my secret ingredient ....... all I can do is to scream a little (demanding Justice and all) , and I have notoriously bad memory, who done wrong to me
so use whatever color you like , except Blue and Red
you can even use Green ones, even if they are my secret ingredient ....... all I can do is to scream a little (demanding Justice and all) , and I have notoriously bad memory, who done wrong to me
Holy capacitors! Did I count right 660 electrolytic's per channel? Wow that's impressive. Are they 100uf each or more? And are there more pictures of these wonderful amps I can look at for further inspiration?
@MEGAamp I am starting to get an idea of where your screen name came from, I guess it's better than "Dude with tons of GIANT heatsinks"I am eagerly awaiting your Aleph X progress.
Jeffrey
its 2700uF, each.
i used them, because i had them on hand.
i dont think, it has much advantage in lower ESR than big caps.
XSOZ PCB
In an effort to learn KiCad, I came up with a PCB for the XSOZ. Specifically to fit my heatsinks which are 9.75"W, and to keep wiring cleaner than my usual ratsnest. XSOZ schematic is of Henrik's/Mad_K and of course NP, although I eliminated the .15uF bipolars. Original thread found here: 10w Xsoz. Looks like I may need that XBOSOZ to properly drive this, a bit confused on the whole impedance matching thing. I still have the Pumpkin kit from ZM purchased years ago still waiting to be put together, maybe that'll work. Thoughts?
In an effort to learn KiCad, I came up with a PCB for the XSOZ. Specifically to fit my heatsinks which are 9.75"W, and to keep wiring cleaner than my usual ratsnest. XSOZ schematic is of Henrik's/Mad_K and of course NP, although I eliminated the .15uF bipolars. Original thread found here: 10w Xsoz. Looks like I may need that XBOSOZ to properly drive this, a bit confused on the whole impedance matching thing. I still have the Pumpkin kit from ZM purchased years ago still waiting to be put together, maybe that'll work. Thoughts?
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sorta just copied Mad_K's values. Figured I needed some resistance in front of the mosfet with 100R, with the 1K and 10K, thought I would need additional resistance. I think Mad_K and Henrik were tailoring the XSOZ to their XBOSOZ, which I'll be doing as well....or Pumpkin. Also, in a moment of pure genius, I ordered resistors/caps before I laid out the board, hence the different sized resistors. Of course I would't be adverse to changing the values.
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with that ratio (1K/82R) , these are not doing much - no way its establishing any functional value of NFB
just leave them out , go with SOZ schematic
or , if you insist on feeling that there is some SUSY implemented, for which you really need proper difference between OLG and CLG (which is hard to squeeze in there) , to be functional, use 4K7-10K instead of 82R, and 100K instead of 1K
that way Rin per phase should be roughly value of series resistor
when in doubt - see Pa's .......
like that, even Sparrow's fart will drive eeeny mosfet gates
just leave them out , go with SOZ schematic
or , if you insist on feeling that there is some SUSY implemented, for which you really need proper difference between OLG and CLG (which is hard to squeeze in there) , to be functional, use 4K7-10K instead of 82R, and 100K instead of 1K
that way Rin per phase should be roughly value of series resistor
when in doubt - see Pa's .......
like that, even Sparrow's fart will drive eeeny mosfet gates
confused
Hello ZM, ... and of course others are welcome.
Since most of the people, which populated this thread are not in this job anymore, after all these years, its not easy to revive this thread
dont understand some things:
the X-SOZ schematic of Henrik was well regarded and Mr. Pass himself named it "good work"
ZM, i assess you as a real professional in amplifier design.
you say, that the input resistors of Henriks schematic dont work properly.
On the other side, in Pass article over his version of Zen V6 (SOX) he writes about the input resistor of 1k. but there isnt 1 k in his schematic. its a 221 ohm value???
since i am just a builder and cannot interpret or design amplifier schematics, i am overwhelmed in these things. dont know, what to do, except of building somethin else.
perhaps someone can explain?
My goal is building a 25W X-SOZ with X-balanced Pre, perhaps with a little more gain (3dB) than original SOZ and BOSOZ.
how much can i enhance or decrease the gain of X-SOZ and X-BOSOZ without worsen the sound quality?
would it make sense, to make a additional single stage preamplifier like JFET BOZ or something else and put it before X-BOSOZ for getting more gain?
i guess this amp can really play outstanding good, inspite of all the years have gone. Can`t it?
hope someone has mercy for this
Hello ZM, ... and of course others are welcome.
Since most of the people, which populated this thread are not in this job anymore, after all these years, its not easy to revive this thread
dont understand some things:
the X-SOZ schematic of Henrik was well regarded and Mr. Pass himself named it "good work"
ZM, i assess you as a real professional in amplifier design.
you say, that the input resistors of Henriks schematic dont work properly.
On the other side, in Pass article over his version of Zen V6 (SOX) he writes about the input resistor of 1k. but there isnt 1 k in his schematic. its a 221 ohm value???
since i am just a builder and cannot interpret or design amplifier schematics, i am overwhelmed in these things. dont know, what to do, except of building somethin else.
perhaps someone can explain?
My goal is building a 25W X-SOZ with X-balanced Pre, perhaps with a little more gain (3dB) than original SOZ and BOSOZ.
how much can i enhance or decrease the gain of X-SOZ and X-BOSOZ without worsen the sound quality?
would it make sense, to make a additional single stage preamplifier like JFET BOZ or something else and put it before X-BOSOZ for getting more gain?
i guess this amp can really play outstanding good, inspite of all the years have gone. Can`t it?
hope someone has mercy for this
to confuse things even more
Attached are two of Henrick's XSOZ schematics. One has an extra set of bipolars, and is missing the cross connection between the two lower power resistors (R203/204). The schematic I posted in #803 is a copy of image #2 here, except with 6R power resistors from more bias.
Regarding Ralf's comments, attached is the SOX schema, and an excerpt from that article (art_v6).
"Construction
Figure 4 shows the actual circuit that has been modified from the original SOZ. All the
details of the original project apply to this amp, and I refer you to that article. We see
that the 1 ohm resistor has been removed between the Sources of Q1 and Q2, and we
see the addition of two input capacitors of arbitrary value, 1 Kohm input and 10 Kohm
feedback resistors, which set the gain of the circuit. Also 4.75 Kohm resistors in series
with 5 Kohm pots are used to set the operating point of the Mosfets precisely for best
performance. I will refer to this circuit hereafter as the SOX for brevity."
Attached are two of Henrick's XSOZ schematics. One has an extra set of bipolars, and is missing the cross connection between the two lower power resistors (R203/204).
The schematic I posted in #803 is a copy of image #2 here, except with 6R power resistors from more bias.Regarding Ralf's comments, attached is the SOX schema, and an excerpt from that article (art_v6).
"Construction
Figure 4 shows the actual circuit that has been modified from the original SOZ. All the
details of the original project apply to this amp, and I refer you to that article. We see
that the 1 ohm resistor has been removed between the Sources of Q1 and Q2, and we
see the addition of two input capacitors of arbitrary value, 1 Kohm input and 10 Kohm
feedback resistors, which set the gain of the circuit. Also 4.75 Kohm resistors in series
with 5 Kohm pots are used to set the operating point of the Mosfets precisely for best
performance. I will refer to this circuit hereafter as the SOX for brevity."
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sole difference , with me still puzzled with sentence "1K input, 10K feedback" - is addition of 1K+ elco , at each side , giving some feedback
that way it is, due to LTP-ish fucntion of circuit, in some amopunt SUSY feedback
though, what I meant in my previous post - that's far away from real controlled SUSY effect, simply because circuit is having OLG too low , to have any significant amount of
NFB, while still having desired CLG
so, if one is having desire to build that circuit, choose whichever option you want - you can start with first one (sans or with 1R separate source resistors) , then adding 1K+Elco on each side
or the other way around - build one with NFB , then lift 1K (both) and try it that way
leave what you prefer
in short - 1K in NFB is having a function ...... but "regular" NFB arrangement of SUSY circuit - series resistor defining Rin, NFB resistor defining amount of folded back output sample , and ratio of these two defining amount of NFB - I can't recognise it on any of these pictures
1K/82R ratio is ridicolous , non - applicable to anything ....... all you can is ignore 82R value and it's position, observing 1K NFB resistor alone
if one is using 1K in place of 82R, and 10K in NFB route , that's the other thing
though, note that Rin in that case is approx. equal to series resistor value - so close to 1K per phase
that calls for decent preamp Rout, under or well under 100R
hope I'm clearer now
edit: and yes- use Black Gate in signal path , if you're having masochistic tendencies ........... especially if you're young enough - having a time to live 'till moment they finally start singing
that way it is, due to LTP-ish fucntion of circuit, in some amopunt SUSY feedback
though, what I meant in my previous post - that's far away from real controlled SUSY effect, simply because circuit is having OLG too low , to have any significant amount of
NFB, while still having desired CLG
so, if one is having desire to build that circuit, choose whichever option you want - you can start with first one (sans or with 1R separate source resistors) , then adding 1K+Elco on each side
or the other way around - build one with NFB , then lift 1K (both) and try it that way
leave what you prefer
in short - 1K in NFB is having a function ...... but "regular" NFB arrangement of SUSY circuit - series resistor defining Rin, NFB resistor defining amount of folded back output sample , and ratio of these two defining amount of NFB - I can't recognise it on any of these pictures
1K/82R ratio is ridicolous , non - applicable to anything ....... all you can is ignore 82R value and it's position, observing 1K NFB resistor alone
if one is using 1K in place of 82R, and 10K in NFB route , that's the other thing
though, note that Rin in that case is approx. equal to series resistor value - so close to 1K per phase
that calls for decent preamp Rout, under or well under 100R
hope I'm clearer now
edit: and yes- use Black Gate in signal path , if you're having masochistic tendencies ........... especially if you're young enough - having a time to live 'till moment they finally start singing
Finished...XSOZ Monsters
i ended up with these two monsters
each about 90lbs
unfortunately i only get +- 30 Volts out off my PSU.
but its enough for the moment...
power Mosfets get handwarm, power resistors get about 60 degrees, without additional fans
i think with fans i can drive it to +- 40Volts
since i just finished it, i cannot tell relevant things about how it sounds at this moment.
but be patient, more comming soon.
i ended up with these two monsters
each about 90lbs
unfortunately i only get +- 30 Volts out off my PSU.
but its enough for the moment...
power Mosfets get handwarm, power resistors get about 60 degrees, without additional fans
i think with fans i can drive it to +- 40Volts
since i just finished it, i cannot tell relevant things about how it sounds at this moment.
but be patient, more comming soon.
Attachments
no,
that are 4 300VA transformers
rectifiers and capacitor bank, about 250.00uF is downside
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