Can anybody help with the following:
Balanced Amplifier, J-fet Input, Mos Fet for the rest, 100 Watt/4Ohm Class A with a full power bandwidth of 300 - 400 Khz.
Every information on Spectral and Metaxas amps would be helpful to, but I would feel more comfortable to have a PASS-like design.
Reinhard
Balanced Amplifier, J-fet Input, Mos Fet for the rest, 100 Watt/4Ohm Class A with a full power bandwidth of 300 - 400 Khz.
Every information on Spectral and Metaxas amps would be helpful to, but I would feel more comfortable to have a PASS-like design.
Reinhard
I'll go out on a limb (I think it's fairly well supported though 🙂 ) and say you're barking up the wrong tree if you looking for a "Pass-like" design with a full power bandwidth at 400KHz.
Circuitry-wise, Spectral does a lot of things to get the speed and bandwidth they advertise. Many of these techniques fly in the face of "simpler is better".
Maybe you may get a little closer to what you want by looking at Borbely's All FET designs?
And pay some attention to recent discussions around here about phase margin. Many really wide bandwidth, very fast designs are not easily made acceptably stable driving a wide range of loading scenarios.
mlloyd1
Circuitry-wise, Spectral does a lot of things to get the speed and bandwidth they advertise. Many of these techniques fly in the face of "simpler is better".
Maybe you may get a little closer to what you want by looking at Borbely's All FET designs?
And pay some attention to recent discussions around here about phase margin. Many really wide bandwidth, very fast designs are not easily made acceptably stable driving a wide range of loading scenarios.
mlloyd1
High speed and driving difficult loads is hard to obtain at the same time without stabilityproblems.... You need to have an outputstage with very low zout and phase change to do such a design. It is a hard task!
You need very fast BJT's, JFET's and MOSFET's .. What i mean is > 100MHz so you can control the phase change through each stage ... At the same time the openloop gain has to be low in each stage.
For an amp with good stability:
The single ended ZEN amplifier from www.passdiy.com It is a singlestage design and in theory it should have a phase margin of 90 degrees with perfect mosfet's (fast)!!
Thats a really good example on a stable amplifier and simple too.
Normaly i would say that a phasemargin of 60 degrees would be a good margin.. I would think that the ZEN amplifier would meet this requirement with no problem at all.. But i have not tested or done any sims on a ZEN....
Good stability is more important than wide bandwidth!
Sonny
You need very fast BJT's, JFET's and MOSFET's .. What i mean is > 100MHz so you can control the phase change through each stage ... At the same time the openloop gain has to be low in each stage.
For an amp with good stability:
The single ended ZEN amplifier from www.passdiy.com It is a singlestage design and in theory it should have a phase margin of 90 degrees with perfect mosfet's (fast)!!
Thats a really good example on a stable amplifier and simple too.
Normaly i would say that a phasemargin of 60 degrees would be a good margin.. I would think that the ZEN amplifier would meet this requirement with no problem at all.. But i have not tested or done any sims on a ZEN....
Good stability is more important than wide bandwidth!
Sonny
Actually, if you put a front end on a SOZ, you should be able to get into that range easily.
The power supply, however, will be the size of a kitchen table and it would be best if you lived in a more northerly clime.
Grey
The power supply, however, will be the size of a kitchen table and it would be best if you lived in a more northerly clime.
Grey
Kitchen table
How many of you that built SOZs have supplies the size of kitchen tables? Please post image please, I want to see that sucker...... Actually 100 watts for 4 ohms is pretty impractical for
the Son of Zen design, but Grey can help you with the water cooling part.
H.H.
How many of you that built SOZs have supplies the size of kitchen tables? Please post image please, I want to see that sucker...... Actually 100 watts for 4 ohms is pretty impractical for
the Son of Zen design, but Grey can help you with the water cooling part.
H.H.
100 watt son of zen- water cooled
It would be really a great design for somebody with say, a heated pool, or maybe a 1000 person tea party 😀
It would be really a great design for somebody with say, a heated pool, or maybe a 1000 person tea party 😀
It would be really a great design for somebody with say, a heated pool
You know..... my wife has always wanted a heated pool.....maybe you have hit on a great WAF feature!
H.H. (Hottub Harry)
You know..... my wife has always wanted a heated pool.....maybe you have hit on a great WAF feature!
H.H. (Hottub Harry)
OOpppsss !
I forgot to say that i was talking about amps with feedback ... Of course you do not deal with phase margin in a no negative feedback design.
Sonny
I forgot to say that i was talking about amps with feedback ... Of course you do not deal with phase margin in a no negative feedback design.
Sonny
To all the guys
Hello,
thanks Sonny and Grey,
at the time I`m on that way, no overall feedback, only local degeneration.
Regards to the guys in the pool, drinking tea,
have fun and come back with some real tips.
Reinhard
Hello,
thanks Sonny and Grey,
at the time I`m on that way, no overall feedback, only local degeneration.
Regards to the guys in the pool, drinking tea,
have fun and come back with some real tips.
Reinhard
to Paul B
why?
in Germany theres a speaker called "Manger Schall Wandler", think you have heard of it. This thing is sounding very good with wide bandwidth amps and is sounding very good with Class A amps, maybe it is sounding spectacular with both.
Reinhard
why?
in Germany theres a speaker called "Manger Schall Wandler", think you have heard of it. This thing is sounding very good with wide bandwidth amps and is sounding very good with Class A amps, maybe it is sounding spectacular with both.
Reinhard
MSW & SOZ
I'm driving my Manger's (Zerobox 109) with a 15W SOZ in a horizontal bi-amping setup. Low frequencies are handled by a politically incorrect Yamaha power amp...
Manger's bandwith recommendation only means that you should be aware of e.g. tube amps with an upper limit of 50-100kHz. She/He doesn't say that the faster the amp the better it sounds. Manger demoes his speakers with Vincent SP 991 power amps and although I cannot find any technical info I don't think that these are of extraordinary bandwith.
Btw what is the bandwith of a SOZ?
I'm driving my Manger's (Zerobox 109) with a 15W SOZ in a horizontal bi-amping setup. Low frequencies are handled by a politically incorrect Yamaha power amp...
Manger's bandwith recommendation only means that you should be aware of e.g. tube amps with an upper limit of 50-100kHz. She/He doesn't say that the faster the amp the better it sounds. Manger demoes his speakers with Vincent SP 991 power amps and although I cannot find any technical info I don't think that these are of extraordinary bandwith.
Btw what is the bandwith of a SOZ?
msw --soz
Yes, you are right, they demo with Vincent 991, because it is Class A up to 100 Watt and in a more
payable region than any Spectral or Metaxas.
Regards from Germany,
Reinhard
Yes, you are right, they demo with Vincent 991, because it is Class A up to 100 Watt and in a more
payable region than any Spectral or Metaxas.
Regards from Germany,
Reinhard
For Reinhard and Superstition!
The Vincent 991 specs:
Technische Daten SP-991
Endstufe Mono
Übertragung: 10 Hz - 20 KHz +/- 0,5 dB
Nennleistung Class A 8 Ohm: 100 W
Nennleistung RMS 8 Ohm: 300 W
Eingangsempfindlichkeit: 2 V
Klirrfaktor: < 0,1% (1 kHz 1 W)
Geräuschspannung: > 95 dB
Eingangsimpedanz: 47 kOhm
Netzanschluss: 230 V/50 Hz
Masse: L 430 x H 180 x T 530 mm (x2)
Gewicht: 30 kg
I have a Vincent Hibrid 226 it looks like been made in China...the quality of the solder and the execution of the solder job is very poor...
Regards
Jorge
The Vincent 991 specs:
Technische Daten SP-991
Endstufe Mono
Übertragung: 10 Hz - 20 KHz +/- 0,5 dB
Nennleistung Class A 8 Ohm: 100 W
Nennleistung RMS 8 Ohm: 300 W
Eingangsempfindlichkeit: 2 V
Klirrfaktor: < 0,1% (1 kHz 1 W)
Geräuschspannung: > 95 dB
Eingangsimpedanz: 47 kOhm
Netzanschluss: 230 V/50 Hz
Masse: L 430 x H 180 x T 530 mm (x2)
Gewicht: 30 kg
I have a Vincent Hibrid 226 it looks like been made in China...the quality of the solder and the execution of the solder job is very poor...
Regards
Jorge
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