I didn't know you played for Green Bay.
I don't know, that was a bit before my time. I guessing one of these guys?1967 Green Bay Packers
This might be the "secret" to direct-heated tube coloration.
Scott, I'm still resentful about the '65 bad call. Tom Matte deserved to play in the championship.
I would call it:
The human interpretation of the location of various sound sources during reproduction of the recorded event.
Humans key off specific parameters to interpret the location.
Two key parameters are interchannel intensity difference and interchannel timing difference. Soundminded has proffered the power level as another..
Interchannel time errors I would consider as an unwanted change which would cause incorrect positioning of an image either in full, or by spectra.
But I really think simon was being facetious..
Cheers, John
John,
No not facetious. What happens if one side has energy hang around longer than the other? Does stretching the length of time energy is presented to a listener change their perspective?
Have you ever placed a loudspeaker under a piano to make it seem the piano is being played even when it is not a player piano and no one is there? This is done every so often in bars and restaurants. It can be scary how real it sounds. Is this entirely a visual perception issue? I don't think so as the speaker really needs to couple to the piano's sounding board to get maximum effect.
Intensity is different that volume to me and I think you understand this. Intensity is a three dimensional vector. It is not reproduced with any accuracy in a stereo system. But I do not want to get to the complex conjugate and how to get a "clean" music reference.
ES
I didn't know you played for Green Bay.
1967 Green Bay Packers
No, but I did play a 12min quarter of grade school football as halftime entertainment at a Packers/Rams game in 1962.
My mother found the pictures!
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Lots of good stuff here about tube colorations, they go on and on don't they? Maybe someone should codify them and do a DSP version. Are you telling me that you have a solidstate amp that has 10ms of "reverb". Reverb and ringing are not the same thing. Reverb implies true memory, folks mix this up a lot with cap DA (hint: caps can't carry a tune).
I will add frequency and content selective reverb to a complete sound system to improve the subjective performance!
A fine line between frequency selective reverb and ringing. Does a spring reverb ring? How close is a tube's construction to a spring reverb?
Is mechanical stability a factor in tube sound, most likely. Is it the only one, not at all.
Again the point is that if you do not include time response in your measurements you can miss something. Does solid state gear have issues that the time axis will show? Thermal issues may show up, along with some overlooked mechanical issues.
I resent being compared to JR. That kind of abuse is totally uncalled for.
John Risch? I don't read Asylum like forums anymore, this is bad enough.
Not that fine. A spring has true delay and memory, remember magneto-strictive delay line memories? I had a 4k bit one up and running for weeks as a lab project. There were also the piezo-glass delay lines for SECAM color decoding, SAW filters?
Its a good question. JC would tell you it needs to have wide OL bandwidth for the best sound. I'd concur, but not for the reasons that JC says (TIM.PIM or whatever). I think its because of input stage non-linearities under RF excitation. So the input stage is where we need to have wide bandwidth. This seems hard to get when very low noise is also a goal. Scott's AD797 while great for getting super low noise and incredibly low distortion was chucked out of Walt Jung's ultra-low noise regulator design because of its RF susceptibility. Maybe Scott has something to share in this regard - did Walt speak to you about that?
It wasn't RF issues. I was the one who convinced (at considerable discussion) Walt that we shouldn't use the 797 in a diy regulator project as we had difficulty to keep the whole thing stable in the light of wildly varying loads. But anyway this had nothing to do with 'good sounding opamps' of course.
jan didden
Oh, my apologies Jan - I was sure I read somewhere that it was RF susceptibility. I must dig out Walt's writings to double check. Wasn't the replacement a JFET input type?
AD825 seems to be an excellent choice since the phase characteristics near 0 dB gain is excellent. I have only good to say about this opamp as long as it works in proper conditions. LT1028 seems to work good but personally I have tested this opamp but others have. AD825 is a bit old and I think you can pick a dozen good opamp types today.
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