Has there been a tube product reviewed yet that has been implemented correctly to have only the "good kind of distortion".
Has there been a tube product reviewed yet that has been implemented correctly to have only the "good kind of distortion".
Low order even harmonics are more directly musically related. Higher order harmonics have a much more complex relationship with the original signal. So if you have to have distortion, its better to have, in order of prominence, 2nd, 3rd, and 4th order. Balanced or push-pull circuits / outputs whether tube or solid state will eliminate the even order components and leave the odd order components. That's not an ideal situation, again if you have to have distortion.Is it even or odd order that's supposed to be "euphoric"?
No, they tend to be objectionable. However if an amplifier has relatively strong low order harmonic distortion relative to intermodulation distortion, the IM distortion will be covered up to a degree.What about the inevitable inharmonic intermodulation distortions? Are they euphoric too?
Heroin is "euphoric." Tube amplifiers are euphonic (allegedly).Is it even or odd order that's supposed to be "euphoric"?
It's been 9 years since I did the first one, can confirm. Never tried the secondHeroin is "euphoric." Tube amplifiers are euphonic (allegedly).
Can you please elaborate, I couldn't find anything about Pass desirable distortion on the net.While not using tubes, I'd say Nelson Pass has devoted his career to designing amps with certain, apparently desirable, distortion profiles.
Well, I think you'll search in vain for a Pass bald assertion that "distortion is desirable". However "distortion profile" is another matter.Can you please elaborate, I couldn't find anything about Pass desirable distortion on the net.
Thanx in advance
And there is actually zero data backing up his assertions. To Nelson's credit, he admits that the data aren't there and this is all conjecture and hearsay.Well, I think you'll search in vain for a Pass bald assertion that "distortion is desirable". However "distortion profile" is another matter.
There is Pass' rather famous article, "Audio distortion and feedback". There, for example, Pass says the following ...
"Many audiophiles believe that 2nd harmonic is to be preferred over 3rd harmonic. Certainly it is simpler in character, and it is well agreed that orders higher than third are more audible and less musical. However when given a choice between the sound of an amplifier whose characteristic is dominantly 2nd harmonic versus 3rd harmonic, a good percentage of listeners choose the 3rd.
"I have built many examples of simple 2nd and 3rd harmonic “types” of amplifiers over the last 35 years. When I say “types” I mean that they used simple Class A circuits described as “single-ended” versus “push-pull” and so tended to have a 2nd harmonic versus 3rd harmonic in the character of their distortion, but were not made to deliberately distort.
"Anecdotally, it appears that preferences break out roughly into a third of customers liking 2nd harmonic types, a third liking 3rd harmonic, and the remainder liking neither or both. Customers have also been known to change their mind over a period of time."
Reading the whole article it's apparent that Pass fairly explicitly advocates that a desirable distortion profile minimizes higher order harmonic distortion while tolerating substantial 2nd and/or 3rd order.
Yada yada.And there is actually zero data backing up his assertions. To Nelson's credit, he admits that the data aren't there and this is all conjecture and hearsay.
Ain't marketing wonderful?
But not here. The same conjecture and hearsay has been flung around for decades. Even the marketeers (perhaps especially the marketeers) aren't wasting their time chasing it to show that it's not just the same old bullshit for the gullible; the reality isn't likely to be good for their business.Conjecture & hearsay are the motivation for much scientific investigation.