It’s logical to ask the inverse question, as well.
If you DON’T like it, does it matter how it measures?
If you DON’T like it, does it matter how it measures?
A couple of things that this does indicate is >
As expected (and obviously), not all amplifiers are created equal or the same.
It would also indicate that - amplifiers that have higher voltage & current output than a ChipAmp come with inherent challenges >
This is where the 'charf gets sorted from the wheat' regarding higher power amplifiers. There are winners and loosers.
PS.
It also shows the advantage of having an amplifier that NEVER approaches clipping.
+ there are more parameters regarding 'sound' than just THD >
EG. Rise Time in "Volts per Microsecond" can greatly effect complex waveforms.
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We used the pair driven initallly by a TL071 followed by a BD139/140 pair driving the J50/K135 pair. Later just the J50/K135 pair driven by OPA627. Bias 350 mA, +/- 25V.
Only thing after 30+ years of service are flat caps only noticed by the owner when hum starts to appear. In about all cases replacing the caps leads to initial dissatisfaction!
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I appreciated your reply, but there are some clarifications to be made, in my view.
You design and sell your devices and I don't.
However, I really appreciate your transparency, in the sense that we all know that you are not only a good designer, but you are also a seller/salesman.
Not always it's the case, and when it isn't, some member's replies seem incomprehensible, unless you find out that the person who replieded is also a salesman. 😉
In similar threads/replies we do not know this beforehand because this detail is not written anywhere.
Furthermore, you are an electronics expert/graduate and I'm not.
So we have two very different backgrounds and two different economic interests, just as it should be.
Anyway, you have described a way of knowing how a device sounds from its measurements.
I'm in no way able to scientifically refute or confirm it, but I hope there is someone who can do it and that he will reply in this thread, for the sake of clarity.
So far it seems to me that there is common knowledge universally accepted that measurements describing how a device sounds does not exist.
This very thread is yet another proof of this, instead, if I understand correctly, you said that there is...
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Should this be considered as a friendly post? In fact you say you don't know jack of electronics and that the person that does also sells his self designed and produced electronics (a normal use of talents) thereby implying one interest has to do with the other with regards to neutrality. A hidden agenda suggestion as you state the person is not recognizable as a company owner etc. Please look at the person's name/profile. For instance that of tomchr.
It clearly says "neurochrome.com". I read a lot here and think his commercial activities are rarely in the way of neutrality which is an uncommon treat with the average human. In fact so neutral I had to look up the products.
Then you ask the same person for proof of something that can not be proven by any words to you (or to anyone) as you seem to have a hobby in wordplay. Maybe you could find another way to express your jealousy or inability in electronics just by actually building something? To add your favorite scientific reasoning and measurements describing how a device sounds for instance.
It clearly says "neurochrome.com". I read a lot here and think his commercial activities are rarely in the way of neutrality which is an uncommon treat with the average human. In fact so neutral I had to look up the products.
Then you ask the same person for proof of something that can not be proven by any words to you (or to anyone) as you seem to have a hobby in wordplay. Maybe you could find another way to express your jealousy or inability in electronics just by actually building something? To add your favorite scientific reasoning and measurements describing how a device sounds for instance.
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👎 Your post doesn't deserve a reply and yours is an unjustified and yet another personal attack that violates the forum rules.
I'll reply anyway, because the jealousy is probably all yours.
I clearly said that I appreciate Tom's transparency and that he's one of the few who writes it, what the hell did you read?
Maybe it hurts because you're a kind of salesman too, but it's not made clear anywhere?
Don't you dare judge my person, think about your probably frustrations instead, I'll take care of me myself.
On the other hand, you can't know if you like a device if you've never listened to it.
So you have to listen to it first.
Then you can say if you like it.
If there was a reliable measurement that would tell you the sound quality of a device, you might not listen to it, maybe.
But that measurement doesn't exist.
So you are forced to have to listen to it to know if you like it or not.
If you listen to it in a system that is different from yours and that you don't know, your initial judgment may change once you insert it into your system.
But if you don't listen to it, how can you say if you like it?
This is why I think listening tests are not very useful at all...
It's a question of what you compare it with. Compare your Maplin with itself. A start would be to bridge RV1, 1 kOhm, with a capacitor > 10 uF.
A gradual reworking would also gradually show what sounds where and how. A comparison with itself.
First of all: learn to distinguish between concept (circuit) and object (parts, smaterials).
It is also important to repeat experiences from time to time. Intentionally or unintentionally. After 55 years, just do it again;-)
I say I can only show you the door, go through it, practically, per diy audio, so only you can hear. Practical experience can only be conveyed to a limited extent: I can't listen and interpret for you;-)
As written: no BD139/140 pair so OPA627/OPA637 driving the MOSFETs directly (previously thought to be problematic) turned out to be OK. Antique info but I recall different values stop resistors because of different capacity of J50/K135 to be an improvement.
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The endless circle of pointless discussions about measurement vs. listening test, objectivism vs. subjectivism, cable threads, DLBT, pseudo science and misinformation, and last but not least, each other, continues.
Time to pick up the soldering iron, don't you think?
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