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In Reply to: RE: Theory Man? posted by TomWh on March 22, 2017 at 13:02:04
"Have you ever built a full wave diode vs full wave tube rectifier. Maybe choke vs cap input. Maybe even some damper diode tubes. Then after did you put them in front of the amp to see if you could hear a difference???? "
Of course I have! What tube hobbyist hasn't? In addition to that I have built many regulated HV power supplies. Even a tube based design. And yes I heard a difference, just as the theory predicted and prior art has proven. I found the theory dead on.
Dennis has demonstrated a very weak understanding of electronic principles here. That is a fact plain and simple. It has been debunked by numerous professionals here over the years. You wan't to give him the benefit of the doubt yet you lack that same technical understanding yourself.
And I though I made it clear I build tube stuff as a hobby. I don't listen to Best buy gear. But I also don't look down on those who do because their stuff isn't junk either.
Many of us have...but that does not imply that the theory is therefore 'dead on.'
A 4-tube bridge of mercury vapor rectifiers operating into an L-filter sounds best 99.9% of the time.
Does this comply with your theory?
We know the MV rectifiers have the lowest voltage drop of any tube rectifier. So we then know we will get a stiffer supply.
It a well known fact that tube rectifiers in power amplifiers sag. This modulates the audio signal. The less voltage drop, the less sag.
Now you can have RFI problems with MV tubes, but that can be remedied as you probably have done.
If one wants to keep in the technical realm the MV tubes have a constant voltage drop independent of current so unlike traditional diodes (both solid and hollow) they do not provide sag.
Please show me the math, graphs or machine that told what you would heard??? Bet there is some real demand for that???
Also did you blind test the listening??? Those are your rules???
Now my ears probably are't good enough. but I'll bet there are people who can estimate the db loss at certain frequencies. You could then plot that out based on their empirical observation. Then compare that with the known frequency response curve you programmed into the test.
Now if you want a machine that tells us whether I liked the music or not without any input whatsoever. No we can't do that. But here we are talking about personal taste. That cannot be quantified.
The evenness of a frequency response can be quantified. After all if it couldn't, then a hearing test would not be of any value.
Furthermore the performance test of an audio amplifier is rather simple. It must preserve the applied waveform in every area except gain. Now what is every area? Sure sinewave, square wave sweeps, and pink noise will not tell us all. And to a large extent that is what the hobbyist is limited to. But we have the capabilities of truly analyzing the 106 piece orchestra "waveform" in much detail today to spite what one person here often says. Any digital audio workstation can do that.
How do you think all these compression algorithms were developed. Yeah, yeah, we are talking about crap MP3 and other compressed formats on an audiophile forum. But you can't ignore the technology that was required to accomplish that feat.
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