We must have a waste bin section. GL 75 and Quad 57's seem to come from them. That is like a Ferrari and a Triumph Bonneville in a waste bin. The Bonneville is a pile of rubbish. I would love to have one again. I would de-tune it to 7:1 and fit SU carburetor( 1 ).
My 5534 circuit could be all active. It might actually help.
My 5534 circuit could be all active. It might actually help.
Strictly speaking, I agree fall time would be the nearest absolute oppostite to rise time. However, since there will be some unwanted artefacts after the nominal fall time, such as ringing, settling time takes that into account as well.
On the other hand, I feel settling time, which takes into account the unwanted resonances, is a more realstic depcition of the actually usable time. To me, at least, so I never talk about fall time, as that is not the end of the story for me.
When you think about it, a lot this is really mincing words - is the glass half full or half empty, is it the neck, or the throat. This is caused by a lack of international standardization, I believe. The Germans had it just right, their DIN standard in its day included complex ideas which were given standard names, and if you didn't use the standardized terms, your paper would not be accepted for publishing until it did.
As things stand, we are asking for trouble. For example, when one says "slew rate", it is automatically ASSUMED he is talking about voltage slew rate, because after all, we do also have current slew rate. The very fact that there are at least two forms of slew rate possible makes saying just "slew rate" imprecise.
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In 1957 we might have found the high point of excellence. This has to include people recording music as what is hi fi without that. Audio Fidelity Louis Armstrong comes to mind.
Garrard 301 . Good amp ( take your pick ). Quad 57's
Now the quest is to do very high spec minimal component count. Sometimes even a valve helps that. I notice my Pro Audio friends prefer valve mics and only for technical superiority which they can hear. They think the distortion being very low and the hiss low is no bad thing. That's right, being low.
Garrard 301 . Good amp ( take your pick ). Quad 57's
Now the quest is to do very high spec minimal component count. Sometimes even a valve helps that. I notice my Pro Audio friends prefer valve mics and only for technical superiority which they can hear. They think the distortion being very low and the hiss low is no bad thing. That's right, being low.
This is having sufficient quality to the sound such that it "fools" your hearing to the point where the speakers become completely invisible. Not often heard, because it's difficult to pull off, but it means that you can move your head as close to the speaker drivers as you like, literally inches away, and you can't pinpoint the source of sound using your hearing. If you were to put on a blindfold you would be unable to find, point to the speakers even if you standing right besides them, while they were working at any volume level.
Yes, and how about Ella and Louis? A great record, originally on Verve.
Talk of 2N3055 and NE5534 as old devices is curious but not correct. If you find new old stock Signetics NE5534 you have the real part but anything made currently is mapping the specs, not the same part at all. Even the masks can't be used since the wafers both parts were originally designed for are not in common use anymore. The processes have been revised many times with new masks as long as there is a substantial market. Trying to keep a 30 year old process exactly as it was makes no economic sense.
The only place you would find masks that match the originals is a Chinese bootleg copy.
I would expect a new 2N3055 would surpass most of the original specs pretty easily. Has anyone tested a new part for SOA or response time? How about uncasing a new one and a vintage part and comparing the die size? And the current NE5532 /NE5534 will be similar in specs but very different inside, probably with a significantly smaller die.
The only place you would find masks that match the originals is a Chinese bootleg copy.
I would expect a new 2N3055 would surpass most of the original specs pretty easily. Has anyone tested a new part for SOA or response time? How about uncasing a new one and a vintage part and comparing the die size? And the current NE5532 /NE5534 will be similar in specs but very different inside, probably with a significantly smaller die.
Hmm, why only one?
Ingvar Öhman of Ino Audio speakers.
Kapitel 18
Needs translate.
If you're saying that the vast bulk of diyaudio does not believe in these upper limits and perfect transparency, then I'm happily corrected!!
Demian, that may be correct.
Self measured several NE5534 of new make.
The TI version was last and the Fairchild was the best.
The diffence was small though, around 7dB more THD i think in the upper treble.
Groner measured the TI version.
It had excellent transfer linearity.
Non inverted there where some common mode problems.
That can be reduced to near zero with PSU bootstrapping.
Anyway.
Self measured several NE5534 of new make.
The TI version was last and the Fairchild was the best.
The diffence was small though, around 7dB more THD i think in the upper treble.
Groner measured the TI version.
It had excellent transfer linearity.
Non inverted there where some common mode problems.
That can be reduced to near zero with PSU bootstrapping.
Anyway.
For traditional performance I would suspect the JRC (NJM) versions may be the highest performing. They would reflect the Japanese focus on performance specs. http://www.cn.njr.com/PDF/NJM5532_E.pdf They even have selected low noise versions. I am really reluctant to go down the Muses variations. They are just way too expensive.
Has anybody tried this :
Seems to be an alternative to the LME49990 http://datasheets.maximintegrated.com/en/ds/MAX9632.pdf
Seems to be an alternative to the LME49990 http://datasheets.maximintegrated.com/en/ds/MAX9632.pdf
a little nice one :3D Sound - Binaural Recording of a Musical Performance (feat. Peter and Kerry) - YouTube
Does not sound too bad on my Mac Pro with AKG K551.
Does not sound too bad on my Mac Pro with AKG K551.
It looks really interesting. Maxim has new management in the last few years and will actually talk to non tier one customers. They also will have parts more often.
I will be getting some sample to play with.
What's amusing is that it shows apparently better THD than just about anything else, -150dB at 1kHz on output voltages above 2V ...
As far as i can tell this new super low THD opamps have some form of Ahuja compensation :ftp://220.135.93.233/My_Book/JSSC_I...pdfs/ieee/ssc/jssc/1983018/06dec/0629ahuj.pdf
I have seen varieties from Self and Groner.
As far as i understand the compensation is neither refferenced to rail nor to ground but circumvents the circuit from a high impedance node to a low impedance node thereby also improving PSU rejection.
I have seen varieties from Self and Groner.
As far as i understand the compensation is neither refferenced to rail nor to ground but circumvents the circuit from a high impedance node to a low impedance node thereby also improving PSU rejection.
Link is to a protected web site. Perhaps you can clip the essence into something you can post?
I found this Patent: Patent US7646247 - Ahuja compensation circuit for operational amplifier - Google Patents and it seems the basic technique dates from the '80s so its very much in the public domain.
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