Meh... this thread went very quickly off course. Is it really worth saving? It's one of those Blowtorch, Ariel, Subjective vs Objective threads. A few gold nuggets in a car load of sand.
If you want to discuss the article, please do. I won't stop you.
Well Electronic design just published a familiar circuit to many here. A power supply add on filter. I kept meaning to mention the 2N5210 is a better match to the 2N5087 than the 2N5089, but it seems even in the 1/12/12 (US) (12/1/12 others!)Ideas for Design article they continue the same way.
Is this history correct?
SS Designers starts with knowledge that simpler is better, they will choose simplest design in SS like in tubes, may be becuse they found that triode is better than pentode and single plate 2A3 is better than 2 plates.
Then this knowledge applied to SS, the result is low linearity, low supply rejection, then found so called harmonic distortion as a suspect, after that feedback is help, and so, (btw, until now some designer still suspecting THD even if their test result is lower than 0.005%).
Then the feedback becoming another suspect when they found TIM total in mind (btw, also there sill big debate about intermodulation and feedback).
Then etc,etc,etc, 100V/uS slewrate, 100A current peak capability, 300ppb THD, 1MHz power bandwidth, 10000 DF, memory distortion, 20kHz THD, colors (sorry, tubes really has color some of old triode has very nice but ...), and many more.
They choosing this BJT sounds better than that BJT, or this triode than that triode. Without knowing why.
SS Designers starts with knowledge that simpler is better, they will choose simplest design in SS like in tubes, may be becuse they found that triode is better than pentode and single plate 2A3 is better than 2 plates.
Then this knowledge applied to SS, the result is low linearity, low supply rejection, then found so called harmonic distortion as a suspect, after that feedback is help, and so, (btw, until now some designer still suspecting THD even if their test result is lower than 0.005%).
Then the feedback becoming another suspect when they found TIM total in mind (btw, also there sill big debate about intermodulation and feedback).
Then etc,etc,etc, 100V/uS slewrate, 100A current peak capability, 300ppb THD, 1MHz power bandwidth, 10000 DF, memory distortion, 20kHz THD, colors (sorry, tubes really has color some of old triode has very nice but ...), and many more.
They choosing this BJT sounds better than that BJT, or this triode than that triode. Without knowing why.
You do know how to use PM?
Geez.
Courtesy is always a good idea, my friend.
And "full time"? Kidding I hope.
_-_-bear
Wavebourn - please contact me!! (seriously...)
Mr. Curl, I sent you a PM here please check ur PMs??
I can phone you over the weekend...
_-_-bear
PS. the original article made some statements about hearing and audibility of things, anyone?
You start it. These post should in PM.
BTW this PS said about:
I don't. I tried to help, but found that I have no time to help more and more... Too much to study all available options and translate datasheets, may be later when I have some spare time to do so.
Paul Shimmel (apparently in a comment in the original article??) is saying that in his opinion there is a Class D amp running at 400kHz that is "blameless" or as good as any linear amp he has heard...
_-_-bear
PS. Anatoliy, I know English is not your native language, so that may be why you seem confused. Let's forget about it, ok?
_-_-bear
PS. Anatoliy, I know English is not your native language, so that may be why you seem confused. Let's forget about it, ok?
Paul Schimel (not "Shimmel"...) wrote:.....the amplifier (class D) sounded extremely accurate with wonderful tonality......at the end of part 2.
When quoting, do it accurate to prevent "distortion".
That article is worth reading IMO.
The quote comes from here:
Transistors, Tubes Sound The Same, It?s The Circuit Topologies That Differ
Transistors, Tubes Sound The Same, It?s The Circuit Topologies That Differ
That's the same article Pano, the quote is at the end of part 2 (same link as in the first post of this thread).
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