this amplifier is the improved version of a traditional VAS preamp🙂
you can apply this concept on every preamp schematic
to drive directly the loudspeaker
you can apply this concept on every preamp schematic
to drive directly the loudspeaker
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The circuit you're showing is just the Musical Fidelity A1 amplifier. Hardly revolutionary, and also not particularly well engineered in my point of view, judging by Mark Hennessy's assessment of his!
Now I'm completely sure that Stee is exacty a troll. He is not serious, don't take his posts into consideration.
I don’t know, but I think that some of the moderators are at the same”level” and maybe they think that he is genius. 🙄
So why should they see him as a “Troll”?
Seems like the rule is to put the smart people in the sin bin or bann them, and protect the idiots. 😱
Have fun
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Stinius,
If you are so smart, why aren't you in the sin bin??
Stee's idea is still worthy of discussion, even if you don't like it. After all, it's the basis of the MF A1, so it has commercial significance. Is your last design commercial?
If everyone here was equally smart, the forum would be unprintable, redolent with conflict and acrimony. As it stands, the mods do a good job.
If you are so smart, why aren't you in the sin bin??
Stee's idea is still worthy of discussion, even if you don't like it. After all, it's the basis of the MF A1, so it has commercial significance. Is your last design commercial?
If everyone here was equally smart, the forum would be unprintable, redolent with conflict and acrimony. As it stands, the mods do a good job.
+1000 from me also ...i will stand next to aksa once more ....
to me STEE is a nice and polite person ....other than that some of the things said makes sense some others no ...generally speaking its hard to follow his thoughts
to me STEE is a nice and polite person ....other than that some of the things said makes sense some others no ...generally speaking its hard to follow his thoughts
The above statement is nonsens..
Whole circuit is suboptimal (constant current source in output stage ,output stage conected with CE, whole voltage and current gain in one stage, much better si EF push-pull class A, better efectivity and linearity).Undegenerated dif. input, resistor loaded input instead of CM, /"optical symetry"-2k2resistors/ The only advantage is simplicity and costs..It will be "musical" but for sure not "fidelity".🙂
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BV,
Could you present a rational argument in favour of designing for fidelity, rather than musicality? What ever is wrong with a musical amplifier? Is this forbidden?
Confused......
I can not see any rational argument of designing for "musicality". Amplifier is not artist, nor musician. It should "only" amplify momentary input voltage, not to ad or remove emotions.. This is enough rational argument, I think. It is not forbiden, but ...
...but some people get accustomed to certain types of distortion so when they hear a "true" amplifier their brain overloads from all the info they can suddenly hear in the recording and they can't take it. Thus we are still, in this age of modern semi's, worried about nickel and dime transistor count and blahh blah... Taking a simple circuit like this and adding linearization techniques, a little local FB here or FF there, voltage regulators ect, and you can make a good amp....although it would be almost a complete re-design....🙄
Oh yeah,
nonsens...
EF or SF is the way to go.....
Oh yeah,
nonsens...EF or SF is the way to go.....
BV,
There is a strange flaw in your comment. You imply that musicality and fidelity are mutually exclusive, then you say that a musical amp is fine, BUT......
I think your opinions are very strong and based on ideology. Your knowledge of amp design is may be based on theory alone. Ask any guitar amp designer, if they took your approach, they'd all go broke in a year. Study the Fender, the Marshall, and tell me these are NOT designed for distortion, or, as is preferred in music amps, 'harmonic structure'. Build a few different topologies, and marvel at the distinctive sounds they make, which are very, very difficult to measure.
Humans like distortion of certain kinds. That is why many like single ended tube amps, with huge levels of THD. Get used to it..... there is art in amp design, it is not all engineering, and neither is it rocket science. If you decompose your argument to notions of 'fidelity' and 'accuracy', you fly in the face of the aural preferences of many audiophiles.
There is a strange flaw in your comment. You imply that musicality and fidelity are mutually exclusive, then you say that a musical amp is fine, BUT......
I think your opinions are very strong and based on ideology. Your knowledge of amp design is may be based on theory alone. Ask any guitar amp designer, if they took your approach, they'd all go broke in a year. Study the Fender, the Marshall, and tell me these are NOT designed for distortion, or, as is preferred in music amps, 'harmonic structure'. Build a few different topologies, and marvel at the distinctive sounds they make, which are very, very difficult to measure.
Humans like distortion of certain kinds. That is why many like single ended tube amps, with huge levels of THD. Get used to it..... there is art in amp design, it is not all engineering, and neither is it rocket science. If you decompose your argument to notions of 'fidelity' and 'accuracy', you fly in the face of the aural preferences of many audiophiles.
For all the basic correctness of placing Re in the emitter leg, there are at least hundreds of thousands of commercial and DIY CFP amplifiers with Stee's configuration. To incorporate VI limiting, it has been the only economical way.
Some of these designs have received wide acclaim and peer approval from other professional designers without such comment. In fact, the very popular current text on amp. design ignores the "correct" arrangement altogether. One could even assume that it is not "correct" at all.
Stee, keep up the work that you have begun and hold those ideas that brought you here to DIY. Your ideas are welcome to many and we can only ask that they make it to prototypes and successful projects. Best wishes &
Some of these designs have received wide acclaim and peer approval from other professional designers without such comment. In fact, the very popular current text on amp. design ignores the "correct" arrangement altogether. One could even assume that it is not "correct" at all.
Stee, keep up the work that you have begun and hold those ideas that brought you here to DIY. Your ideas are welcome to many and we can only ask that they make it to prototypes and successful projects. Best wishes &
I agree fundamentally the guitar amp is part of the instrument and its sound as part of the instrument in the recorded media is subject to opinion. But this distortion as part of the music should not be subject to any distortion from the stereo amplifier that is reproducing the sound. At least that is the logical goal I see.🙄
My ears have been opened by a wide BW, high damping, low noise power amp and the difference in clarity and perception is astonishing even with ordinary CDs.
My ears have been opened by a wide BW, high damping, low noise power amp and the difference in clarity and perception is astonishing even with ordinary CDs.
2 AKSA
I said:"It is not forbiden, but ... " ..it is not clever. Guitar amp is musical instrument, it is creating electrc guitar sound acording musician needs and feelings. Amp for HiFi reproduction is something completely different , it should nothing create,not emotions nor musicality , it belongs to musicians.
And my knowledges are not based on theory alone, I made many amplifiers,like this, or this, with measured results e.g.like this.
Schematic posted by Stee is maybe worst possible attempt to made good sounding amplifier.
I said:"It is not forbiden, but ... " ..it is not clever. Guitar amp is musical instrument, it is creating electrc guitar sound acording musician needs and feelings. Amp for HiFi reproduction is something completely different , it should nothing create,not emotions nor musicality , it belongs to musicians.
And my knowledges are not based on theory alone, I made many amplifiers,like this, or this, with measured results e.g.like this.
Schematic posted by Stee is maybe worst possible attempt to made good sounding amplifier.
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Ivo,
I was wrong, you are experienced, very experienced. In that case we agree to disagree, it is the best way. My views are almost diametrically opposite to yours, I'm apparently not very clever, but there ya go, takes all types.....
I might add that I too would not design an amp like Stee's, or MF come to that, but that is hardly surprising and not a good reason to condemn others that present their ideas free of constraint on this wonderful forum. Perhaps you should be more tolerant.
Hugh
I was wrong, you are experienced, very experienced. In that case we agree to disagree, it is the best way. My views are almost diametrically opposite to yours, I'm apparently not very clever, but there ya go, takes all types.....
I might add that I too would not design an amp like Stee's, or MF come to that, but that is hardly surprising and not a good reason to condemn others that present their ideas free of constraint on this wonderful forum. Perhaps you should be more tolerant.
Hugh
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