"Simple common sense" can be misleading when it comes to science, and engineering based on that science. If we followed common sense then we would never have relativity or quantum mechanics, so no GPS, no semiconductors, no lasers etc.drlowmu said:
Fortunately, in a PP amp it is not necessry to perfectly invert a signal. A good attempt is sufficient to reduce even-order distortion. The result is less loss and degradation than you get with an SE amp.
Yes. The ideal is a straight wire with gain. For that you need reasonably linear amplification and the appropriate amount of feedback. Best done with P-P.
Even order distortion elimination is also possible, to some extent with SE amplifiers. It depends of your tube choices and configuration. 🙂
Subjectively, when it comes to sonics, I prefer SE over P-P, but it isn't the only factor here. I'd prefer a better implemented PP than a poor SE one.
Subjectively, when it comes to sonics, I prefer SE over P-P, but it isn't the only factor here. I'd prefer a better implemented PP than a poor SE one.
Hi Paolo, nice to see you!
If we all think the same way, the world would be very boring. 😛😀
In which case it would affect both, SE and PP.
As far as I know, valves are by far more linear than transistors, so the natural place for the former is voltage amplification and current amplification for the latter.
For a given topology, SE or PP, some people can distinguish between EI and double C cores, and for the same core type, some people can distinguish between core materials.
Maybe for the wrong reasons, but audiofools sometimes are right.
Some people can distinguish absolute phase, also I know that a woman (Ex Ortofon) can distinguish between SS and vacuum rectifiers!!!
If we all think the same way, the world would be very boring. 😛😀
In which case it would affect both, SE and PP.
As far as I know, valves are by far more linear than transistors, so the natural place for the former is voltage amplification and current amplification for the latter.
For a given topology, SE or PP, some people can distinguish between EI and double C cores, and for the same core type, some people can distinguish between core materials.
Maybe for the wrong reasons, but audiofools sometimes are right.
Some people can distinguish absolute phase, also I know that a woman (Ex Ortofon) can distinguish between SS and vacuum rectifiers!!!
I am sorry to rain in your parade, but relativity is not contrary to common sense, its very basic principles are "pure common sense", maybe you interpreted it wrong.
Recent research show that in a double slit experiment, the photon pass through only one slit, contrary to Copenhagen interpretation, which is the basis for non-common sense quantum mechanics.
Y por si fueramos pocos parió la abuela...
And in case we were few, the grandmother had a baby... 😛😀
Yes of course. My point was that microphony is more critical at low level. Never found a phono stage better than the Dynavector run in "enhanced mode".
I am not sure about that. Small signal transistors can be quite linear and there are "easy" solutions (like cascodes, for example) to make a voltage amplifier very linear.
The problem with this is that people say a lot of things and you rarely know what they did precisely! I am not saying that they do not hear differences but I doubt about the conclusions. An EI transformer might be just worse because the laminations vibrate worse.....
It gets annoying very quickly, when discussion gets personal (SE listeners this..., SE listeners that...) that´s also against rules.
Making people feel miserable, will not help anything
If you think SE is crap THD-wise; it has poor PSRR; it´s true. I am not mad.
I built my stuff with tube distortion on mind, and satisfied with it as-is (aware about the technical flaws it has).
If i was chasing lowest THD, i would go transistors.
Let me throw a blanket of doubt of this affirmation. Transistors are proven to have much higher distortion then tubes, or almost a kind of dist. less tasty than tubes.
I didn't realize that there was different SE and PP "camps" in valve/tube DIY. This is not why I am on this board...
I have built various PP and SE amplifiers over the years. Mostly for different purposes or wishes. I also have been using far more "sand" recently, since it is so useful for specific duties. I look back and can honestly say that I have come a long way and have enjoyed nearly every minute of it!
Never before have we had such a wealth of knowledge and supply of high quality components at our finger tips. We are all so very fortunate.
I have built various PP and SE amplifiers over the years. Mostly for different purposes or wishes. I also have been using far more "sand" recently, since it is so useful for specific duties. I look back and can honestly say that I have come a long way and have enjoyed nearly every minute of it!
Never before have we had such a wealth of knowledge and supply of high quality components at our finger tips. We are all so very fortunate.
One thing that tubes do much better than transistors is glow. I tried to make my transistors glow once but they had trouble functioning reliably at the same time, so I stick with tubes whenever I want to make amplifiers with glowing active devices.
SpreadSpectrum,
it works better with those nice diodes in the small, transparent glass envelope. They glow nicely, although lifetime is admittedly ... short.
Regards,
Andreas
it works better with those nice diodes in the small, transparent glass envelope. They glow nicely, although lifetime is admittedly ... short.
Regards,
Andreas
Once I saw a 7414 catching flames from its inside, and a pretty fine cigarette lightener.
What is wrong with this Forum?
I thought this thread was about a Power Supply with choke, for a L-W 2A3 SET amp ??
Why all these off-topic posts?
Jeff
Jeff,
maybe it is because people are here to enjoy their hobby and have some fun. This is not a support platform for paid professionals where time is money and only efficiency counts.
Regards,
Andreas
maybe it is because people are here to enjoy their hobby and have some fun. This is not a support platform for paid professionals where time is money and only efficiency counts.
Regards,
Andreas
This thread was really dead for over 1.5 years and before somebody dug it out and made post #7
In post 17 I said:
In post 31 LinuksGuru agreed with me (quoting post 17):
In post 35 hpeter quoted the first part of post 31 and said:
I was puzzled by this, as my original post and LinuksGuru's comment on it contained no hate, no BS, no FUD. Just statements which are true, and reasonable and measured - although I suppose some SET fans may not like them. Hence my response in post 36:
(Sorry to bore everyone with this history, but it saves you having to search back)
Now you say:
I said that many SET fans don't believe in feedback. Is this remark personal? Is it untrue?
I said that people may get used to a particular sound. Is this remark personal? Is it untrue?
Which rule have I broken?
This is a technical discussion about drlowmu's claim about the supposed superiority of smallish PSU caps. I have offered a technical explanation as to why some people might think this. If you disagree, why not show the flaws in what I said rather than merely objecting to it being said? Provide evidence that SET fans mostly prefer feedback, for example? Or that SET amps are usually so powerful that they usually run nowhere near their power limits so produce very little 2nd order distortion, and so do not produce music envelope modulation of their supply rails.
As fas as I can see that contains statements which are true, either about technical issues or the preferences of SET fans. It contains no personal remarks or insults.DF96 said:
In post 31 LinuksGuru agreed with me (quoting post 17):
LinuksGuru said:
In post 35 hpeter quoted the first part of post 31 and said:
hpeter said:
I was puzzled by this, as my original post and LinuksGuru's comment on it contained no hate, no BS, no FUD. Just statements which are true, and reasonable and measured - although I suppose some SET fans may not like them. Hence my response in post 36:
DF96 said:
(Sorry to bore everyone with this history, but it saves you having to search back)
Now you say:
Where are the personal remarks? As far as I am aware, personal remarks are remarks made against a person. I suppose this could be extended to personal remarks made about a group (e.g. "SET fans are smelly" 😎) - but I made no such remarks.hpeter said:
I said that many SET fans don't believe in feedback. Is this remark personal? Is it untrue?
I said that people may get used to a particular sound. Is this remark personal? Is it untrue?
Which rule have I broken?
This is a technical discussion about drlowmu's claim about the supposed superiority of smallish PSU caps. I have offered a technical explanation as to why some people might think this. If you disagree, why not show the flaws in what I said rather than merely objecting to it being said? Provide evidence that SET fans mostly prefer feedback, for example? Or that SET amps are usually so powerful that they usually run nowhere near their power limits so produce very little 2nd order distortion, and so do not produce music envelope modulation of their supply rails.
Did anyone say you are mad?
DF96, I read most of your posts and have never noticed even a hint of personal attack against anyone and indeed you always remain unfailingly polite even when provoked. Your technical knowledge and experience, which you give out most generously, is one of the highlights of this forum.
Unfortunately, it is human nature to feel under attack if beliefs are challenged........
Unfortunately, it is human nature to feel under attack if beliefs are challenged........
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