Never said it was perfect, Scott. I think. But yes, at last it is something class B that I can live with after decades of hunting. But I'm still curious, really really curious: will other be able to hear and appreciate what I can hear from my amps?????
Don't you know that you can't borrow listening acuity? 😉 It happens over and over again. I said, listen to this and that (while showing my skill with the Foobar ABX), and the answer, no i can't hear any differences!
You're blind if you can't understand that people have different listening acuity. Online tests show this acuity difference. The question I'm interested with is: does it matter for you to have amp with 0.01% THD if listening test show that your threshold is 0.5%? So there I have my theory about your acuity should be better than the threshold of the test.
BTW, my friend at work seems to understand sound well. He produced music and own music studios. He knows rich audiophiles and have listened to their stuffs. He was not interested with the sound of those 'high end' stuff. I have had a plan to bring my amp to work without telling him anything. But without a good/big speaker, will he be able to hear that the amp is really extraordinary? Because, I myself, initially cannot really see how it is different except when I change amp from others to mine. The more i do it, the more i understand the difference.
analog_sa,
you should avoid balanced topologies as much as possible and you should always agree with me.
johnego,
the grounded emitter amplifier is much stronger than the voltage follower (grounded cathode being the very best). Its implementation may not be uncomplicated, proper device needs to be chosen with care to drive only one FET.
you should avoid balanced topologies as much as possible and you should always agree with me.
johnego,
the grounded emitter amplifier is much stronger than the voltage follower (grounded cathode being the very best). Its implementation may not be uncomplicated, proper device needs to be chosen with care to drive only one FET.
Wait a minute, please.
In light of what is now known about human perceptual testing, I'm not convinced it has ever been done properly in audio (nor in some cases outside of audio).
Maybe DPH will want to chime in with his views, if he happens to be reading along.
One problem is that publications never include enough information to allow accurate replication of the experiment. Standards for human testing have evolved to include a requirement independent replication.
In addition, the number of test subjects required for acceptable statistics keeps going up, and Effect Size also needs to included in study results.
Unless engineers who want to do human perceptual testing recruit experts in such testing as research collaborators, it is unlikely any testing they perform will actually be conducted properly.
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Which all means I can safely ignore what anybody says about what they do or do not hear, I knew that already.
I'm impressed. I think i have said in this thread that long ago i have an amp prototype that i think can become the best amp in the world (class B). It's based on an assumption that latfet is better sounding than other transistors (in class B) except for its low transconductance problem which i think i have solved in that prototype, driven with something that seemed to comply with your description (but i didn't use tubes). Funny thing is, why we don't see an example of such circuit?? I guess because people cannot hear the difference. Same problem again.
One could think about comparison of two amplifiers: 1) tube SE amp Lamm ML3 Signature ; 2) some Rotel hi-fi amp. System should be hi-end level, with speakers let say Wilson Alexandria. What one could expect, will sound be different with these two amps? Which amp will be better? Standard measurements of which amp will be better?
Earl Geddes had his wife as collaborator, a psychologist. Not sure what her CV looks like, although I know Earl feels confident in their work. My understanding from Earl is that their results are thought to apply to about 95% of the population of the Earth. He said if we wanted to test the other approximately 5% of people then new tests would have to be devised, and that a preliminary study on that would cost probably cost somewhere in the range of a few to several tens of thousands of dollars.
How many amp designers here at DIYAudio do you think could afford to do even a preliminary study on their claims? I think the number would probably be zero.
Other than Earl's claim about his wife's qualifications, haven't seen coauthors on human hearing publications that I would consider perceptual testing experts by today's standards. Maybe there are some though. Be happy to look at any publications you care to link or cite.
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No, seriously. If N101N understands how to drive latfet, why the others don't? If others understand, why they don't have it designed? Where is the example of said schematic??? I may publish the prototype if i found it (its working but performance was not yet superb), because i have found my current best amp but this one is really using technique you/I have never seen before so i won't publish it.
I don't understand... what is wrong with balanced topology??? And i don't even understand what you mean with 'balanced' topologies...
He could have been wrong of course. My impression is that it was merely a casual thought that could well have been expressed in that way because he's done with the whole testing business.
Can we make that generalization?
If resistors are audible, then wires and cables are audible.
If wires and cables are audible, silver wires, cotton isolation, teflon and gold are also audible in their incorporation into electronic materials.
If this is all audible and not measurable, then there is another dimension to audio, it is called Schizophrenia is a mental illness characterized by abnormal behavior, strange speech, and a decreased ability to understand reality. Other symptoms may include false beliefs, unclear or confused thinking, hearing voices that do not exist, reduced social engagement and emotional expression, and lack of motivation. ¨(Schizophrenia - Wikipedia)
If resistors are audible, then wires and cables are audible.
If wires and cables are audible, silver wires, cotton isolation, teflon and gold are also audible in their incorporation into electronic materials.
If this is all audible and not measurable, then there is another dimension to audio, it is called Schizophrenia is a mental illness characterized by abnormal behavior, strange speech, and a decreased ability to understand reality. Other symptoms may include false beliefs, unclear or confused thinking, hearing voices that do not exist, reduced social engagement and emotional expression, and lack of motivation. ¨(Schizophrenia - Wikipedia)
Try searching these web sites.
ITU Telecommunication Standardization Sector
IEEE - The world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
I'm quite shocked that you can't find this stuff...
Unfortunately, sometimes things we don't normally expect to be audible are found to audible in certain circumstances. Of course, when things are audible, then they are also measurable, not that they necessarily show up in an easy-to-measure fixed level 1kHz FFT, but they might.
Please don't make bad jokes about schizophrenia. It is a serious debilitating disease, one in which people hear primarily voices of people who are not present. The voices pretty much always say very bad things about afflicted person, e.g. that they are the devil, that they are evil, that they must die, or must kill, etc. Not funny at all.
Schizophrenia has nothing to do with it.
Some people just think they can't fool themselves.
Yes, Sir! Busy making a list of all the balanced circuits i have for their timely demise. Will report when done. Not sure if the parts are still good for SE reuse or they have been tarnished forever.
I didn't say I can't find publications. I say they are not credible, particularly when it comes to people who spend a lot of time designing amplifiers and listen very carefully for the effects of any change. Practice matters a whole lot in how brains recognize patterns in sound waves.
In any case, most published medical research is false, as it turns out. And researching hearing ability is medical research. The work of John Ioannidis is taken very seriously in that area:
John P.A. Ioannidis' Profile | Stanford Profiles
John Ioannidis - Wikipedia
For example:
Why Most Published Research Findings Are False
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I think prat and all the things involved with that (phase alignment, pitch, etc) are what wakens the senses to be able to be fully involved......Hence sounding better.
Are there ways to measure prat vs freq response real time?
Are there ways to measure prat vs freq response real time?