As I eagerly await the Penultimat ZEN article I will
go ahead and build a small SOZ. If I chose to use light
bulbs would Grow Lux lamps make the listening experience
more mellow or tend to add more veiling of a non audio nature?
Regards, bob12345678 AKA Woody
go ahead and build a small SOZ. If I chose to use light
bulbs would Grow Lux lamps make the listening experience
more mellow or tend to add more veiling of a non audio nature?
Regards, bob12345678 AKA Woody
Remember, you can use lights with a reflector, pointing back and up at the wall. i.e. wallwashers. Then you might get usable light AND tunes. I think they still have 120v track lights, which have lots of interesting fixtures to choose from. Just bolt the fixture to the base and hardwire them.
Mark
Mark
LIGHT BULBS
Yes , I like light bulbs. For example, I used 2 x 60W / 24volt replacing R1 and R2 (ref. SOZ circuit) .
I put one of these to each half of the circuit replacing all others current sourcing resistors(R3 -4 and R5 , R6)too. R7 was 0.47ohm.
Yes , I like light bulbs. For example, I used 2 x 60W / 24volt replacing R1 and R2 (ref. SOZ circuit) .
I put one of these to each half of the circuit replacing all others current sourcing resistors(R3 -4 and R5 , R6)too. R7 was 0.47ohm.
One step to an Aleph?
😕 Do I like your XSOZEN? Hard to say, I don't understand it and I doubt that it will work. As far as I can ascertain, the circuit will not attain a useful steady state condition, let alone pass a signal. Was this post intended to be serious? Have you tried it and do you believe it works?
Ian.
😕 Do I like your XSOZEN? Hard to say, I don't understand it and I doubt that it will work. As far as I can ascertain, the circuit will not attain a useful steady state condition, let alone pass a signal. Was this post intended to be serious? Have you tried it and do you believe it works?
Ian.
Stephano
Sorry to sound like a disbeliever, but are you sure you transcribed the circuit that you are listening to correctly? I was being serious when I said that I couldn't see how it can work. DC conditions aside, I don't understand the function of the two ZTX550s connected bewteen the diff input pair and the output stage. To me, it looks like the output of the IRF9610 are fed into the collector of the ZTX550's - what is the purpose of this arrangement? I also do not understand the purpose of the two parallel 8R resistors connected between the negative power supply and the output stage Sources. What is the intended value of Vds for the output IRFP044 in this configuration?
Sorry if this sounds negative - it is not supposed to be. Perhaps I am a bit slow but I would like to understand the operation of your circuit, particularly if it sounds as good as you say.
Ian.
Sorry to sound like a disbeliever, but are you sure you transcribed the circuit that you are listening to correctly? I was being serious when I said that I couldn't see how it can work. DC conditions aside, I don't understand the function of the two ZTX550s connected bewteen the diff input pair and the output stage. To me, it looks like the output of the IRF9610 are fed into the collector of the ZTX550's - what is the purpose of this arrangement? I also do not understand the purpose of the two parallel 8R resistors connected between the negative power supply and the output stage Sources. What is the intended value of Vds for the output IRFP044 in this configuration?
Sorry if this sounds negative - it is not supposed to be. Perhaps I am a bit slow but I would like to understand the operation of your circuit, particularly if it sounds as good as you say.
Ian.
I apologize . In effect there is a big graphic error .Ztx 550 are there to cascode the diff pair and output from IRF9610 must go to the each emitter of Ztx 550 and NOT into collectors .
APOLOGIES to everyone .
8 ohm and 1 ohm are POWER resistor : all 8 ohm 50W , 1 ohm 20W.
8 ohm resistors in parallel connected between negative supply and output stages are current sources for the output stages exactly like it is for SOZ circuit.
Vds , would be about 7.5 volt .
I like your interest and I thank you for let US know there are errors on the schematic…
Stefano
APOLOGIES to everyone .
8 ohm and 1 ohm are POWER resistor : all 8 ohm 50W , 1 ohm 20W.
8 ohm resistors in parallel connected between negative supply and output stages are current sources for the output stages exactly like it is for SOZ circuit.
Vds , would be about 7.5 volt .
I like your interest and I thank you for let US know there are errors on the schematic…
Stefano
Cascodes
🙂 Ah, now I begin to understand... I'll have a closer look at this tonight and maybe run a few simulations. Thanks for taking the time to respond.
Ian.
🙂 Ah, now I begin to understand... I'll have a closer look at this tonight and maybe run a few simulations. Thanks for taking the time to respond.
Ian.
It sounds in a different way, certainly. I don’t know how much the difference can be pronounced if your Original Soz was rated ,for example 30W. Mine was rated 5W. It seems to me more dynamic, even more <faster> to solve intricate orchestral masses , with good tonal equilibrium.
Also , speakers I use are nearly 3 ohm of impedance at higher frequencies , in this compartment something is changed with this amp. Bass is deep and well placed . Stereophonic scenery is <magic> with my eyes that sees over the wall without apparent concentration to the present. It is absolutely free from noises. Total silence . Without regulated supplies.
Stefano.
Also , speakers I use are nearly 3 ohm of impedance at higher frequencies , in this compartment something is changed with this amp. Bass is deep and well placed . Stereophonic scenery is <magic> with my eyes that sees over the wall without apparent concentration to the present. It is absolutely free from noises. Total silence . Without regulated supplies.
Stefano.
It sounds in a different way, certainly. I don’t know how much the difference can be pronounced if your Original Soz was rated ,for example 30W. Mine was rated 5W. It seems to me more dynamic, even more <faster> to solve intricate orchestral masses , with good tonal equilibrium.
Also , speakers I use are nearly 3 ohm of impedance at higher frequencies , in this compartment something is changed with this amp. Bass is deep and well placed . Stereophonic scenery is <magic> with my eyes that sees over the wall without apparent concentration to the present. It is absolutely free from noises. Total silence . Without regulated supplies.
Stefano.
PS . something wrong goes with previous posting .
Also , speakers I use are nearly 3 ohm of impedance at higher frequencies , in this compartment something is changed with this amp. Bass is deep and well placed . Stereophonic scenery is <magic> with my eyes that sees over the wall without apparent concentration to the present. It is absolutely free from noises. Total silence . Without regulated supplies.
Stefano.
PS . something wrong goes with previous posting .
I was thinking about building 10W SOZ, but now X SOZ sounds even more interesting. I would probably do it without cascode. How it works with single ended sources?
It sounds in a different way, certainly. I don’t know how much the difference can be pronounced if your Original Soz was rated ,for example 30W. Mine was rated 5W. It seems to me more dynamic, even more faster to solve intricate orchestral masses , with good tonal equilibrium.
Also , speakers I use are nearly 3 ohm of impedance at higher frequencies , in this compartment something is changed with this amp. Bass is deep and well placed . Stereophonic scenery is magic with my eyes that sees over the wall without apparent concentration to the present. It is absolutely free from noises. Total silence . Without regulated supplies.
Stefano.
Sorry if I post it three times but some word fails
Also , speakers I use are nearly 3 ohm of impedance at higher frequencies , in this compartment something is changed with this amp. Bass is deep and well placed . Stereophonic scenery is magic with my eyes that sees over the wall without apparent concentration to the present. It is absolutely free from noises. Total silence . Without regulated supplies.
Stefano.
Sorry if I post it three times but some word fails
It works without cascode. But for single ended sources I doubt. Because Gates of Original Soz are virtual grounds while in this case a voltage is present at the input pins .Probably it works not as well as it can… But you could convert into balanced operation your source in other ways …
Stephano
I think it works without the cascode too thoughI doubt that it will affect single ended input operation significantly (but I haven't tried it). More importantly though, I think there is still an error in your schematic. As shown the cascodes are incorrectly biased. Swapping the 10k resistors to connect to lower to -ve and the upper to ground would help.
To me this does not represent an X-SOZ, it is much closer to the Aleph-X concept, i.e. two gain stages. I suspect the latter to have better performance than this variation, although maybe this is based on my lack of understanding of the role of some of the parts in your design.
I still think that it is a fairly simple matter to convert a SOZ to X operation by the addition of two resistors as I posted earlier. I've yet to hear why this simple modification will not work.
Comments anybody? This is a rather small discussion group at present.
Ian.
I think it works without the cascode too thoughI doubt that it will affect single ended input operation significantly (but I haven't tried it). More importantly though, I think there is still an error in your schematic. As shown the cascodes are incorrectly biased. Swapping the 10k resistors to connect to lower to -ve and the upper to ground would help.
To me this does not represent an X-SOZ, it is much closer to the Aleph-X concept, i.e. two gain stages. I suspect the latter to have better performance than this variation, although maybe this is based on my lack of understanding of the role of some of the parts in your design.
I still think that it is a fairly simple matter to convert a SOZ to X operation by the addition of two resistors as I posted earlier. I've yet to hear why this simple modification will not work.
Comments anybody? This is a rather small discussion group at present.
Ian.
You're right, I would call that 2 gain stages. A cascode
I don't call a gain stage, usually, and a darlington is
questionable, but we can bend the rules and still stay
within the "zen" concept.
Earlier, someone commented on simply using the front
end in the patent with the folded cascode and all, which
if scaled up for current would make an interesting Xzen
I don't call a gain stage, usually, and a darlington is
questionable, but we can bend the rules and still stay
within the "zen" concept.
Earlier, someone commented on simply using the front
end in the patent with the folded cascode and all, which
if scaled up for current would make an interesting Xzen
Ian Macmillan
Did you post a circuit of the values and location of the resistors in your X-SOZ circuit? I think I must have missed it, I'll look again.
Did you post a circuit of the values and location of the resistors in your X-SOZ circuit? I think I must have missed it, I'll look again.
Nelson, doesn't Sephano's earlier circuit qualify as a scaled up X front end, albeit without all the current sources? Schematic attached again (Stephano-X-SOZ) below in case you missed it before.
Nania, I did post an idea before with some plausible resistor values though I wouldn't call it a fully developed implementation. I've attached this again too (Ian-X-SOZ).
Ian.
Nania, I did post an idea before with some plausible resistor values though I wouldn't call it a fully developed implementation. I've attached this again too (Ian-X-SOZ).
Ian.