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#121
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
On May 15, 9:20 am, Eeyore
wrote: Andre Jute wrote: Yo, Gerry, I'm a professional communicator. You mean windbag. Graham Precisely! |
#122
Posted to rec.audio.tubes
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Intelligence and RIAA
On May 15, 1:33 pm, John Byrns wrote:
Although I knew what bodge means, it seems like you Brits suffer from the same problem, perhaps we learned if from you. Exactly what territory does today's British Commonwealth include? At present? Some 53 sovereign nations mostly former British colonies. But the simple inclusion of India kinda-sorta dwarfs the rest of the world (excepting China). Peter Wieck Wyncote, PA |
#123
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
John Byrns said: John, my apologies. I have only just noticed that you are posting from rec.audio.tubes as your prime group. Ignore everything I wrote above - you are right and I am wrong. Just as Alice found when she stepped through the mirror into looking glass land, everything there works backwards from the real world. Don, I don't understand what the prime group I am posting from has to do with this issue and your sudden understanding? Could you please explain? He say you toobies live in Bizarro world. Him stay, you go home! Har! -- Krooscience: The antidote to education, experience, and excellence. |
#124
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
In article ,
Sander deWaal wrote: (Don Pearce) said: Did you know there are 2.5 * 10^29 Barns in a square Rod, though? Hah! Did you know the average snail travels 3 furlongs per fortnight? Bet you didn't! ;-) Well, I just looked it up, and they do 0.03mph - which is about 80 furlongs per fortnight. You have slow snails! We feed 'em beer, so they're mostly running around in circles. Lucky Lager was especially good for that. Stephen |
#125
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
Gerry wrote:
On May 15, 9:08 am, Andre Jute wrote: Yo, Gerry, I'm a professional communicator. I say exactly what I mean, no more, no less. I see, said Alice. -- Nick |
#127
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
In article .com,
Peter Wieck wrote: John: Whoops: http://www.graniteaudio.com/phono/page5.html should get you there. For the record: Whatever positions and suppositions you may take, and from whatever point of view, whichever cutting head and system, the actual subject-at-hand is the *present* RIAA Curve as practiced each day. This is presumably a fixed value both on recording and playback. That curve is at the bottom of the article. The Bass Boost and the Treble Cut on playback cross the Bass Cut and Treble Boost on recording at ~1.2Khz.... not quite what you are writing. References are at the bottom of the article. Peter, this article assumes that a "magnetic" pickup is being used to reproduce the LP. "Magnetic" pickups do not respond directly to the amplitude of the signal recorded in the LP's grooves and requires compensation. Let me attempt to explain, I'm going to assume that you have some knowledge of math and know what differentiation is. Let's consider an LP recording which has had a music signal cut into it. Now in our playback system we need to read the amplitude of the signal cut into the disc and convert it into an electrical signal of varying amplitude to drive our speaker system, while along the way undoing any amplitude equalization that was incorporated when the music signal was originally cut into the disc using the RIAA record equalization. Now you are insisting that RIAA playback equalization involves a large high frequency cut approximating some 38 dB, while I claim that RIAA playback equalization involves the boosting of the amplitude of the high frequency signals cut into the disc by approximately 12 dB. What accounts for the difference in our perspectives? The difference is simply explained by the fact that you are lumping two separate equalization curves together while I am talking about only the equalization necessary to counter the RIAA amplitude equalization applied when the music was cut into the grooves of the record. Then article you cite assumes that the LP is being played with a "magnetic" pickup. It is a characteristic of "magnetic" pickups that they differentiate the amplitude of the music signal cut into the record groove to produce the electrical output. The differentiation of the recorded amplitude causes the signal output of the "magnetic" pickup to be tilted upwards towards the high frequencies at a rate of 6 dB per octave, which results in a very tinny sound unless this effect is compensated for. To restore the output of the "magnetic" pickup back to a flat representation of the recorded amplitude on the disc, we must pass its output through an integrator circuit. An integrator produces a response which falls towards the high frequencies at a rate of 6 dB per octave, falling approximately 50 dB at 15 kHz vs. 50 Hz, this is the first part of your equalizer. The second part of your equalizer is the same as my RIAA amplitude equalizer and consists of shelving the high frequencies up by approximately 12 dB using the time constants of 318.3 usec. and 75 usec.. When you combine the "magnetic" pickup equalizer and the RIAA amplitude equalizer into a single composite circuit you have what you call "RIAA equalization". This equalization is the sum of a 50 dB high frequency cut for "magnetic" pickup compensation and a high frequency boost of 12 dB for RIAA amplitude equalization, giving a net high frequency cut of 38 dB for the combined network. Using a pickup that is directly responsive to the recorded groove amplitude, like say an FM pickup, or a strain gauge pickup, eliminates the need for the pickup compensation integrator required with a "magnetic" pickup, and leaves us with the need to provide only the 12 dB high frequency boost required by the RIAA cutting curve. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
#128
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
John Byrns wrote:
the rate at which the stylus moves during its swings - low-frequency signals would be recorded with a much larger swing than high-frequency signals of the same original amplitude. So, the low frequency grooves would be much wider than the grooves on an equalized disk. This is only because you have chosen to take a velocity centric perspective, if you took the more natural groove amplitude view, you would see that the low frequency grooves would be no wider than high frequency grooves, ? Yep, you're a tube guy all right... |
#129
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
On May 15, 5:33 pm, John Byrns wrote:
In article .com, Peter Wieck wrote: John: Whoops: http://www.graniteaudio.com/phono/page5.html should get you there. For the record: Whatever positions and suppositions you may take, and from whatever point of view, whichever cutting head and system, the actual subject-at-hand is the *present* RIAA Curve as practiced each day. This is presumably a fixed value both on recording and playback. That curve is at the bottom of the article. The Bass Boost and the Treble Cut on playback cross the Bass Cut and Treble Boost on recording at ~1.2Khz.... not quite what you are writing. References are at the bottom of the article. Peter, this article assumes that a "magnetic" pickup is being used to reproduce the LP. "Magnetic" pickups do not respond directly to the amplitude of the signal recorded in the LP's grooves and requires compensation. Let me attempt to explain, I'm going to assume that you have some knowledge of math and know what differentiation is. Let's consider an LP recording which has had a music signal cut into it. Now in our playback system we need to read the amplitude of the signal cut into the disc and convert it into an electrical signal of varying amplitude to drive our speaker system, while along the way undoing any amplitude equalization that was incorporated when the music signal was originally cut into the disc using the RIAA record equalization. Now you are insisting that RIAA playback equalization involves a large high frequency cut approximating some 38 dB, while I claim that RIAA playback equalization involves the boosting of the amplitude of the high frequency signals cut into the disc by approximately 12 dB. What accounts for the difference in our perspectives? The difference is simply explained by the fact that you are lumping two separate equalization curves together while I am talking about only the equalization necessary to counter the RIAA amplitude equalization applied when the music was cut into the grooves of the record. Then article you cite assumes that the LP is being played with a "magnetic" pickup. It is a characteristic of "magnetic" pickups that they differentiate the amplitude of the music signal cut into the record groove to produce the electrical output. The differentiation of the recorded amplitude causes the signal output of the "magnetic" pickup to be tilted upwards towards the high frequencies at a rate of 6 dB per octave, which results in a very tinny sound unless this effect is compensated for. To restore the output of the "magnetic" pickup back to a flat representation of the recorded amplitude on the disc, we must pass its output through an integrator circuit. An integrator produces a response which falls towards the high frequencies at a rate of 6 dB per octave, falling approximately 50 dB at 15 kHz vs. 50 Hz, this is the first part of your equalizer. The second part of your equalizer is the same as my RIAA amplitude equalizer and consists of shelving the high frequencies up by approximately 12 dB using the time constants of 318.3 usec. and 75 usec.. When you combine the "magnetic" pickup equalizer and the RIAA amplitude equalizer into a single composite circuit you have what you call "RIAA equalization". This equalization is the sum of a 50 dB high frequency cut for "magnetic" pickup compensation and a high frequency boost of 12 dB for RIAA amplitude equalization, giving a net high frequency cut of 38 dB for the combined network. Using a pickup that is directly responsive to the recorded groove amplitude, like say an FM pickup, or a strain gauge pickup, eliminates the need for the pickup compensation integrator required with a "magnetic" pickup, and leaves us with the need to provide only the 12 dB high frequency boost required by the RIAA cutting curve. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/- Hide quoted text - - Show quoted text - Fly **** on the left, pepper on the right. John, you cannot _EVER_ admit that you have it wrong, and you search for the exception every time. Every damned pick-up I have from the Ortophon MC-20 & MC-30 through various Shures and Grados is "magnetic". The order-of-discussion is not strain-gauge pick-ups, crystal pick-ups (which do not get RIAA equalization). What is the order-of-discussion is those pick-ups that I have as part of the "great unwashed" and use every damned day. Either on my Revox, or my Rabcos or whatever else I choose to use. So, for those beasts as-used by the bulk of the individuals here, Bass is boosted, Treble is cut. On Playback. And Bass is cut and Treble is boosted. On recording. However much smoke and mirrors you might throw to the contrary, that just happens to be .... the .... way .... it .... is. Peter Wieck Wyncote, PA Any other suggestions? |
#130
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
John Byrns wrote: Peter Wieck wrote: John: Whoops: http://www.graniteaudio.com/phono/page5.html should get you there. For the record: Whatever positions and suppositions you may take, and from whatever point of view, whichever cutting head and system, the actual subject-at-hand is the *present* RIAA Curve as practiced each day. This is presumably a fixed value both on recording and playback. That curve is at the bottom of the article. The Bass Boost and the Treble Cut on playback cross the Bass Cut and Treble Boost on recording at ~1.2Khz.... not quite what you are writing. References are at the bottom of the article. Peter, this article assumes that a "magnetic" pickup is being used to reproduce the LP. "Magnetic" pickups do not respond directly to the amplitude of the signal recorded in the LP's grooves and requires compensation. Let me attempt to explain, I'm going to assume that you have some knowledge of math and know what differentiation is. Why makes it so complicated ? The magnetic pickup responds not just to the amplitude of the signal in the groove but it's rate of change too. So a signal of the same amplitude on the disc at say 2kHz will produce a voltage at the pickup that's twice what it would be at 1kHz. Graham |
#131
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA/cycling and fitness.
John Byrns wrote: In article , Patrick Turner wrote: When you get lean and fit, the natural heart rate at rest will fall from a common 64BPM down to say 52BPM even if you are 60 like me. A young bloke of 25 who did the exercize I take would benefit even more greatly, and have a HR maybe 45. When I was fit when 40, my HR was 47BPM. But how do you tell time properly if your resting heart rate isn't a nice 60 BPM? Also notice that 60 neatly factors into 2*2*3*5. I have business that runs to TA time, and to extend the days to make more time than other ppl have, i lowered heartrate to 52 which isn't bad for an old codger like me. When I have expired totally, the heart won't have to keep time, and days will stretch infinitely, and I will not have to worry how long anything takes, and can luxuriate my mind by considering all there is to consider that is mathematically beautiful about gain/phase shift/NFB/stability equations. They say the Band Up There needs some better PA gear...... 52 is unlucky, with factors of 2 x 2 x 13. I should watch my step. Patrick Turner. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
#132
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA/cycling and fitness.
Keith G wrote: snip, 60 eh? - I'm 60 *tomorrow*!! :-) Look, I lied a bit. I have 2 months to go before 60 arrives. I feel 30 most days Patrick Turner. |
#133
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
In article .com,
Peter Wieck wrote: Fly **** on the left, pepper on the right. John, you cannot _EVER_ admit that you have it wrong, and you search for the exception every time. Peter, you are one sick puppy and a liar to boot. If you truly believe that I cannot _EVER_ admit that I have it wrong, I suggest you check the exchange I had with Henry Pasternack last Friday and Saturday in the thread titled "Stability in Feedback Amplifiers, Part Deux-A" where I opened a posting Saturday afternoon with these words "Hi Henry, You are absolutely correct, I was wrong, the "KAB" network does provide an exact solution for the for the RIAA playback curve as you have demonstrated." What do you make of that? There is no exception here, I am explaining how it works without any exceptions, there is no other way for it to work. Your problem is that you get a distorted view of me because when we disagree you are invariably wrong, as now. Every damned pick-up I have from the Ortophon MC-20 & MC-30 through various Shures and Grados is "magnetic". I have no doubt of that, however there are plenty of pickups in the world that aren't "magnetic". But that is really beside the point as my mention of "magnetic" pickups was simply an attempt to try explaining to you something you apparently don't know about "magnetic" pickups and their equalization requirements. The point I have been making is the relationship between the amplitude of the electric signal coming from the microphone and the amplitude of the modulations etched in the grooves of an LP cut according to the RIAA recording curve. This has nothing to do with the type of pickup that is ultimately used to reproduce the LP, although obviously different types of pickups will have different equalization requirements when playing the same record. Now here is the relevant experiment for you to try. First take an audio frequency sweep generator and feed its output into the cutting system through the RIAA record equalizer and on to the cutting head. Set the generator to sweep from 50 Hz up through 15 kHz with a constant output level at all frequencies, set the level low enough so that it doesn't smoke the cutting head at the high frequency end of the sweep. Next record the frequency sweep onto a disc. Finally by whatever method you prefer, measure the amplitude of the modulations cut into the grooves of the LP at a sufficient number of frequency points so that you can draw a graph of the recorded groove amplitude vs. frequency. Now look at the shape of the groove amplitude graph you have just drawn, which represents the total equalization applied to the constant amplitude frequency sweep signal that you have recorded. What you will see is that the amplitude of the high frequencies cut into the LP's grooves are shelved down by approximately 12 dB, not boosted as you claim. You have provided no evidence to show that what I have said is wrong, you are simply using vigorous assertion to press your position without even bothering to advance a single argument in support your position. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
#134
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
On Tue, 15 May 2007 17:31:24 -0500, John Byrns
wrote: In article , (Don Pearce) wrote: John, are you still insisting that RIAA playback requires high frequency boost? It doesn't. An RIAA phono preamp has a feedback mechanism that provides high frequency cut. I have designed several myself, and studied the circuits and operation of many. Had I (and every other designer on the planet) been getting it wrong all the time, our systems would be muffled and entirely without top. They are not; they play back just fine, and certainly for my own, when I play a white noise track on a test disc (recorded with standard pre-emphasis before you say anything), I recover noise which is flat within about 1dB from 30Hz to 20kHz. *Please* go and do some reading so you can back away gracefully from this ridiculous position you are placing yourself in. Don, yes I am still insisting that RIAA playback requires high frequency boost. Why are you suggesting that I might want to back away from this position? Let me attempt to explain, I'm going to assume that you have some knowledge of math and know what differentiation is. Let's consider an LP recording which has had a music signal cut into it. Now in our playback system we need to read the amplitude of the signal cut into the disc and convert it into an electrical signal of varying amplitude to drive our speaker system, while along the way undoing any amplitude equalization that was incorporated when the music signal was originally cut into the disc using the RIAA record equalization. Now you are insisting that RIAA playback equalization involves a large high frequency cut approximating some 38 dB, while I claim that RIAA playback equalization involves the boosting of the amplitude of the high frequency signals cut into the disc by approximately 12 dB. What accounts for the difference in our perspectives? The difference is simply explained by the fact that you are lumping two separate equalization curves together while I am talking about only the equalization necessary to counter the RIAA amplitude equalization applied when the music was cut into the grooves of the record. You are assuming that the LP is being played with a "magnetic" pickup. It is a characteristic of "magnetic" pickups that they differentiate the amplitude of the music signal cut into the record groove to produce the electrical output. The differentiation of the recorded amplitude causes the signal output of the "magnetic" pickup to be tilted upwards towards the high frequencies at a rate of 6 dB per octave, which results in a very tinny sound unless this effect is compensated for. To restore the output of the "magnetic" pickup back to a flat representation of the recorded amplitude on the disc, we must pass its output through an integrator circuit. An integrator produces a response which falls towards the high frequencies at a rate of 6 dB per octave, falling approximately 50 dB at 15 kHz vs. 50 Hz, this is the first part of your equalizer. The second part of your equalizer is the same as my RIAA amplitude equalizer and consists of shelving the high frequencies up by approximately 12 dB using the time constants of 318.3 usec. and 75 usec.. When you combine the "magnetic" pickup equalizer and the RIAA amplitude equalizer into a single composite circuit you have what you call "RIAA equalization". This equalization is the sum of a 50 dB high frequency cut for "magnetic" pickup compensation and a high frequency boost of 12 dB for RIAA amplitude equalization, giving a net high frequency cut of 38 dB for the combined network. Using a pickup that is directly responsive to the recorded groove amplitude, like say an FM pickup, or a strain gauge pickup, eliminates the need for the pickup compensation integrator required with a "magnetic" pickup, and leaves us with the need to provide only the 12 dB high frequency boost required by the RIAA cutting curve. Get it, it's simple once you understand it, the "RIAA phono preamp" you are describing is really doing two equalization jobs, pickup compensation and compensation for the RIAA amplitude response. Regards, John Byrns John, I stopped reading "let me explain", I'm afraid. Don't take this badly, please. I did that because I knew that whatever followed was going to be a catalogue of misunderstanding and error. It isn't too important really what those errors are. What is important is that they are errors, which thirty seconds of research (google for phono preamp sche,matic - that should do it) will show you. You will then be in the enviable position of knowing something that you have been getting completely wrong for years, and being able to learn something new. Please make this small effort before you post again. I promise you won't find it wasted. And do listen and understand when I tell you that those of us who have designed audio gear have never, ever designed an RIAA preamp that boosts rather than reduces high frequencies, Do some web research and see if you can find one. d -- Pearce Consulting http://www.pearce.uk.com |
#135
Posted to rec.audio.tubes
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Intelligence and RIAA
crosspostings from hate groups removed
On Wed, 16 May 2007 04:30:18 GMT, (Don Pearce) wrote: John, I stopped reading "let me explain", I'm afraid. Don't take this badly, please. I did that because I knew And anyone who's bothered to read through the interminable thread can see that John is also correct. His viewpoint comes from an understanding of the historical context. Anybody still interested might want to explore the differences between amplitude and velocity, and *why* they're historically treated differently in cutter-head amplifiers. Hint: it involves feedback. All good fortune, Chris Hornbeck |
#136
Posted to rec.audio.tubes
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Intelligence and RIAA
"John Byrns" wrote in message ... In article , "Iain Churches" wrote: "John Byrns" wrote in message ... What are a few of the reasons? I assume the main reason the RIAA recording curve shelves down the high frequency groove amplitude is because if the high frequencies weren't reduced while cutting the record the groove velocity, and acceleration, at high frequencies would be too much for the playback pickup to cope with. Cutting the high frequency amplitude during recording also would reduce the "pinch" effect. Maybe an expert can tell us the reasons why the high frequency amplitude is shelved down when cutting a record following the RIAA recording curve? The down side is that a "bodge" in the form of a complementary high frequency amplitude boost must be applied during playback, which accentuates the high frequency noise. John. You seem to have got your RIAA curves confused. The recording curve actually shelves at LF because this is generally only lateral modulation which would otherwise take up too much physical room on the surface of the disc. Iain, you are the one that seem to have got your RIAA curves confused. Perhaps your confusion derives from your phobia of equalizers. Read again what I wrote, notice the phrase "groove amplitude", I was speaking of the amplitude that is cut into the groove. What I said is correct, and since you mention the "physical room on the surface of the disc", it is worth mentioning that it is the "amplitude" that determines how much physical room is required to accommodate a given recording on the surface of the disc. Precisely! And that is the very reason the LF needs to be attenuated when the disc is cut. The RIAA cutting curve, together with variable pitch set by the advance head, allows some 25 mins of a typical symphonic work to be cut on one side. This is quite a contrast to flat response and fixed pitch which allows 8 mins! I have a Westrex cutting amp in my workshop. It's response is almost identical to the RIAA recording curve at: http://www.kolumbus.fi:80/iain.churc...cord_Curve.png At 100Hz about -14dB (ref 1kHz) and at 10kHz some +13dB Come over and take a look if you don't believe me:-) Regards Iain |
#137
Posted to rec.audio.tubes
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Intelligence and RIAA
"Arny Krueger" wrote in message ... "Jon Yaeger" wrote in message Better stick to something that you understand, Jon. That leaves audio out of your diet. And recording out of yours, Arny!! :-) Iain |
#138
Posted to rec.audio.tubes
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Intelligence and RIAA
"John Byrns" wrote in message ... Perhaps your confusion derives from your phobia of equalizers. Phobia, what phobia? My version of the three band equaliser which we discussed is up and running, while are you are still huffing and puffing and holding your RIAA plots upside-down:-) Regards Iain |
#139
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
Don Pearce wrote: On Tue, 15 May 2007 17:31:24 -0500, John Byrns wrote: In article , (Don Pearce) wrote: John, are you still insisting that RIAA playback requires high frequency boost? It doesn't. An RIAA phono preamp has a feedback mechanism that provides high frequency cut. I have designed several myself, and studied the circuits and operation of many. Had I (and every other designer on the planet) been getting it wrong all the time, our systems would be muffled and entirely without top. They are not; they play back just fine, and certainly for my own, when I play a white noise track on a test disc (recorded with standard pre-emphasis before you say anything), I recover noise which is flat within about 1dB from 30Hz to 20kHz. *Please* go and do some reading so you can back away gracefully from this ridiculous position you are placing yourself in. Don, yes I am still insisting that RIAA playback requires high frequency boost. Why are you suggesting that I might want to back away from this position? Let me attempt to explain, I'm going to assume that you have some knowledge of math and know what differentiation is. Let's consider an LP recording which has had a music signal cut into it. Now in our playback system we need to read the amplitude of the signal cut into the disc and convert it into an electrical signal of varying amplitude to drive our speaker system, while along the way undoing any amplitude equalization that was incorporated when the music signal was originally cut into the disc using the RIAA record equalization. Now you are insisting that RIAA playback equalization involves a large high frequency cut approximating some 38 dB, while I claim that RIAA playback equalization involves the boosting of the amplitude of the high frequency signals cut into the disc by approximately 12 dB. What accounts for the difference in our perspectives? The difference is simply explained by the fact that you are lumping two separate equalization curves together while I am talking about only the equalization necessary to counter the RIAA amplitude equalization applied when the music was cut into the grooves of the record. You are assuming that the LP is being played with a "magnetic" pickup. It is a characteristic of "magnetic" pickups that they differentiate the amplitude of the music signal cut into the record groove to produce the electrical output. The differentiation of the recorded amplitude causes the signal output of the "magnetic" pickup to be tilted upwards towards the high frequencies at a rate of 6 dB per octave, which results in a very tinny sound unless this effect is compensated for. To restore the output of the "magnetic" pickup back to a flat representation of the recorded amplitude on the disc, we must pass its output through an integrator circuit. An integrator produces a response which falls towards the high frequencies at a rate of 6 dB per octave, falling approximately 50 dB at 15 kHz vs. 50 Hz, this is the first part of your equalizer. The second part of your equalizer is the same as my RIAA amplitude equalizer and consists of shelving the high frequencies up by approximately 12 dB using the time constants of 318.3 usec. and 75 usec.. When you combine the "magnetic" pickup equalizer and the RIAA amplitude equalizer into a single composite circuit you have what you call "RIAA equalization". This equalization is the sum of a 50 dB high frequency cut for "magnetic" pickup compensation and a high frequency boost of 12 dB for RIAA amplitude equalization, giving a net high frequency cut of 38 dB for the combined network. Using a pickup that is directly responsive to the recorded groove amplitude, like say an FM pickup, or a strain gauge pickup, eliminates the need for the pickup compensation integrator required with a "magnetic" pickup, and leaves us with the need to provide only the 12 dB high frequency boost required by the RIAA cutting curve. Get it, it's simple once you understand it, the "RIAA phono preamp" you are describing is really doing two equalization jobs, pickup compensation and compensation for the RIAA amplitude response. Regards, John Byrns John, I stopped reading "let me explain", I'm afraid. Don't take this badly, please. I did that because I knew that whatever followed was going to be a catalogue of misunderstanding and error. It isn't too important really what those errors are. What is important is that they are errors, which thirty seconds of research (google for phono preamp sche,matic - that should do it) will show you. You will then be in the enviable position of knowing something that you have been getting completely wrong for years, and being able to learn something new. Please make this small effort before you post again. I promise you won't find it wasted. And do listen and understand when I tell you that those of us who have designed audio gear have never, ever designed an RIAA preamp that boosts rather than reduces high frequencies, Do some web research and see if you can find one. d -- Pearce Consulting http://www.pearce.uk.com Don, baby: You amused me with your barns and rods (should they be roods?) in this thread where Sander fed his slug Amstel, made me wonder if I shouldn't give you another chance, if I hadn't misjudged you as just another humourless purveyor of excessive negative feedback who should be kicked on sight. So, just in case you really aren't an enemy of fidelity, I'm going to give you a tip and hope St Peter is watching and inscribing my incredible generosity in the Big Book Before the Pearly Gates. Save yourself a lot of grinding frustration and anger and either: a) do not argue with John Byrns on this, meaning drop out now, don't even tell him to look it up or b) accept that what you think you know has some pinholes in it to which John has already taken a reamer and, before this is over, will take a bloody great big angle grinder, and therefore go look it up yourself with your prejudices (what you might prefer to call your education and knowledge) put firmly aside in a locked box I've seen John grind down the graduate engineers before, politely, persistently. He never hesitates to apologize when he is wrong, and he will always give your argument full consideration and your goodwill the benefit of the doubt, but I have never seen him fail to understand the warp and weft of something thoroughly before he starts. You might note that Chris Hornbeck, a guy who sees through bull**** and encrustations of hallowed practice to the true fundmentals beneath, has decided that John is right, giving you the key to why John is right: "differences between amplitude and velocity, and *why* they're historically treated differently in cutter-head amplifiers". (Thanks, Chris. I was struggling with whether that is it or whether it is more complicated.). Or, in pure self-protection, Don me old gabbas, you might look up some old RAT threads in which John (ever so politely!) wiped the floor with that toe-rag Pasternack, admittedly a dullard, but a dullard who claims to have a Stanford MSEE and observably has a glib way with the math that often borders on deceit about professional matters, and sometimes deliberately steps over that limit, after which Pasternack usually claims that John drove him to betraying his profession or, even more laughably, "I did it in my zeal to flame Andre". See above for either of two simple acts you may perform to save yourself from landing up in the same position as Plodnick vis a vis John. There, my duty is done. My money is on Mr Byrns to find all the tees that aren't crossed and all the eyes that aren't dotted, and to slot them into a Teflon-covered, Kevlar-armoured argument. Thanks again for the chuckle. Andre Jute The trouble with most people is not what they don't know, but what they know for certain that isn't true. --- Mark Twain There are more things in Heaven and Earth, Horatio, than in thy fondest dreams. --- Will the Shake |
#140
Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
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Intelligence and RIAA
Andre Jute wrote: if I hadn't misjudged you as just another humourless purveyor of excessive negative feedback who should be kicked on sight. Define excessive. Graham |
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Intelligence and RIAA
Andre Jute wrote:
Don Pearce wrote: On Tue, 15 May 2007 17:31:24 -0500, John Byrns wrote: In article , (Don Pearce) wrote: John, are you still insisting that RIAA playback requires high frequency boost? It doesn't. An RIAA phono preamp has a feedback mechanism that provides high frequency cut. I have designed several myself, and studied the circuits and operation of many. Had I (and every other designer on the planet) been getting it wrong all the time, our systems would be muffled and entirely without top. They are not; they play back just fine, and certainly for my own, when I play a white noise track on a test disc (recorded with standard pre-emphasis before you say anything), I recover noise which is flat within about 1dB from 30Hz to 20kHz. *Please* go and do some reading so you can back away gracefully from this ridiculous position you are placing yourself in. Don, yes I am still insisting that RIAA playback requires high frequency boost. Why are you suggesting that I might want to back away from this position? Let me attempt to explain, I'm going to assume that you have some knowledge of math and know what differentiation is. Let's consider an LP recording which has had a music signal cut into it. Now in our playback system we need to read the amplitude of the signal cut into the disc and convert it into an electrical signal of varying amplitude to drive our speaker system, while along the way undoing any amplitude equalization that was incorporated when the music signal was originally cut into the disc using the RIAA record equalization. Now you are insisting that RIAA playback equalization involves a large high frequency cut approximating some 38 dB, while I claim that RIAA playback equalization involves the boosting of the amplitude of the high frequency signals cut into the disc by approximately 12 dB. What accounts for the difference in our perspectives? The difference is simply explained by the fact that you are lumping two separate equalization curves together while I am talking about only the equalization necessary to counter the RIAA amplitude equalization applied when the music was cut into the grooves of the record. You are assuming that the LP is being played with a "magnetic" pickup. It is a characteristic of "magnetic" pickups that they differentiate the amplitude of the music signal cut into the record groove to produce the electrical output. The differentiation of the recorded amplitude causes the signal output of the "magnetic" pickup to be tilted upwards towards the high frequencies at a rate of 6 dB per octave, which results in a very tinny sound unless this effect is compensated for. To restore the output of the "magnetic" pickup back to a flat representation of the recorded amplitude on the disc, we must pass its output through an integrator circuit. An integrator produces a response which falls towards the high frequencies at a rate of 6 dB per octave, falling approximately 50 dB at 15 kHz vs. 50 Hz, this is the first part of your equalizer. The second part of your equalizer is the same as my RIAA amplitude equalizer and consists of shelving the high frequencies up by approximately 12 dB using the time constants of 318.3 usec. and 75 usec.. When you combine the "magnetic" pickup equalizer and the RIAA amplitude equalizer into a single composite circuit you have what you call "RIAA equalization". This equalization is the sum of a 50 dB high frequency cut for "magnetic" pickup compensation and a high frequency boost of 12 dB for RIAA amplitude equalization, giving a net high frequency cut of 38 dB for the combined network. Using a pickup that is directly responsive to the recorded groove amplitude, like say an FM pickup, or a strain gauge pickup, eliminates the need for the pickup compensation integrator required with a "magnetic" pickup, and leaves us with the need to provide only the 12 dB high frequency boost required by the RIAA cutting curve. Get it, it's simple once you understand it, the "RIAA phono preamp" you are describing is really doing two equalization jobs, pickup compensation and compensation for the RIAA amplitude response. Regards, John Byrns John, I stopped reading "let me explain", I'm afraid. Don't take this badly, please. I did that because I knew that whatever followed was going to be a catalogue of misunderstanding and error. It isn't too important really what those errors are. What is important is that they are errors, which thirty seconds of research (google for phono preamp sche,matic - that should do it) will show you. You will then be in the enviable position of knowing something that you have been getting completely wrong for years, and being able to learn something new. Please make this small effort before you post again. I promise you won't find it wasted. And do listen and understand when I tell you that those of us who have designed audio gear have never, ever designed an RIAA preamp that boosts rather than reduces high frequencies, Do some web research and see if you can find one. d -- Pearce Consulting http://www.pearce.uk.com Don, baby: You amused me with your barns and rods (should they be roods?) in this thread where Sander fed his slug Amstel, made me wonder if I shouldn't give you another chance, if I hadn't misjudged you as just another humourless purveyor of excessive negative feedback who should be kicked on sight. So, just in case you really aren't an enemy of fidelity, I'm going to give you a tip and hope St Peter is watching and inscribing my incredible generosity in the Big Book Before the Pearly Gates. Save yourself a lot of grinding frustration and anger and either: a) do not argue with John Byrns on this, meaning drop out now, don't even tell him to look it up or b) accept that what you think you know has some pinholes in it to which John has already taken a reamer and, before this is over, will take a bloody great big angle grinder, and therefore go look it up yourself with your prejudices (what you might prefer to call your education and knowledge) put firmly aside in a locked box I've seen John grind down the graduate engineers before, politely, persistently. He never hesitates to apologize when he is wrong, and he will always give your argument full consideration and your goodwill the benefit of the doubt, but I have never seen him fail to understand the warp and weft of something thoroughly before he starts. You might note that Chris Hornbeck, a guy who sees through bull**** and encrustations of hallowed practice to the true fundmentals beneath, has decided that John is right, giving you the key to why John is right: "differences between amplitude and velocity, and *why* they're historically treated differently in cutter-head amplifiers". (Thanks, Chris. I was struggling with whether that is it or whether it is more complicated.). Or, in pure self-protection, Don me old gabbas, you might look up some old RAT threads in which John (ever so politely!) wiped the floor with that toe-rag Pasternack, admittedly a dullard, but a dullard who claims to have a Stanford MSEE and observably has a glib way with the math that often borders on deceit about professional matters, and sometimes deliberately steps over that limit, after which Pasternack usually claims that John drove him to betraying his profession or, even more laughably, "I did it in my zeal to flame Andre". See above for either of two simple acts you may perform to save yourself from landing up in the same position as Plodnick vis a vis John. There, my duty is done. My money is on Mr Byrns to find all the tees that aren't crossed and all the eyes that aren't dotted, and to slot them into a Teflon-covered, Kevlar-armoured argument. Thanks again for the chuckle. Andre Jute The trouble with most people is not what they don't know, but what they know for certain that isn't true. --- Mark Twain There are more things in Heaven and Earth, Horatio, than in thy fondest dreams. --- Will the Shake I've read and re-read John Byrne's arguments and still think he's wrong. Every RIAA amplifier I've ever designed and every one I've measured has a voltage amplitude response that boosts the bass end and cuts the treble end. The RIAA curve calls for a 19.36dB boost at 20Hz, and a 19.95dB cut at 21kHz. Both are relative to 1kHz. The IEC curve is identical to the RIAA curve with the exception of the extreme low end which is boosted less on replay to act as a built-in rumble filter. No curve I've ever seen has a 12dB boost to the treble. If John is so precise, I can't understand for the life of me what curve he is referring to. You only have to put a generator to any RIAA input stage to see that the curve is as above, with 19 odd dB boost at the bess end and almost 20 dB cut at the top. S. -- http://audiopages.googlepages.com |
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Intelligence and RIAA
Serge Auckland wrote:
I've read and re-read John Byrne's arguments and still think he's wrong. Every RIAA amplifier I've ever designed and every one I've measured has a voltage amplitude response that boosts the bass end and cuts the treble end. The RIAA curve calls for a 19.36dB boost at 20Hz, and a 19.95dB cut at 21kHz. Both are relative to 1kHz. Of course it does because it is designed to be fed from a magnetic pickup which has a rising output with frequency, that's what the bass boost/top cut are for and the published RIAA replay curve has that assumption built in. The curve does not directly describe the amplitude actually recorded on the disc. Ian |
#143
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Intelligence and RIAA
"Serge Auckland" wrote in
message I've read and re-read John Byrne's arguments and still think he's wrong. Every RIAA amplifier I've ever designed and every one I've measured has a voltage amplitude response that boosts the bass end and cuts the treble end. Or if one prefers, a RIAA playback preamp for a magnetic (velocity) cartridge is roughly an integrator above 50 Hz, except for a bump in response between about 500 and 2122 Hz. If one uses a pickup that does not respond to velocity but instead responds to amplitude, then you don't need the integrator, but you do need the bump. The RIAA curve calls for a 19.36dB boost at 20Hz, and a 19.95dB cut at 21kHz. Both are relative to 1kHz. Agreed. The IEC curve is identical to the RIAA curve with the exception of the extreme low end which is boosted less on replay to act as a built-in rumble filter. Agreed. No curve I've ever seen has a 12dB boost to the treble. Agreed. The two possible alternatives for treble cut are either 20 dB cut above 2122 Hz for a velocity-sensitive pickup, or no cut for an amplitude-sensitive one. If John is so precise, I can't understand for the life of me what curve he is referring to. You only have to put a generator to any RIAA input stage to see that the curve is as above, with 19 odd dB boost at the bess end and almost 20 dB cut at the top. Been there done that, many times. |
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Intelligence and RIAA
Ian Bell wrote:
Serge Auckland wrote: I've read and re-read John Byrne's arguments and still think he's wrong. Every RIAA amplifier I've ever designed and every one I've measured has a voltage amplitude response that boosts the bass end and cuts the treble end. The RIAA curve calls for a 19.36dB boost at 20Hz, and a 19.95dB cut at 21kHz. Both are relative to 1kHz. Of course it does because it is designed to be fed from a magnetic pickup which has a rising output with frequency, that's what the bass boost/top cut are for and the published RIAA replay curve has that assumption built in. The curve does not directly describe the amplitude actually recorded on the disc. A magnetic pickup has a flat response. It converts stylus velocity to voltage. You could consider it as a device that differentiates the stylus displacement, as John Byrns does, but that is not useful so nobody else does it. -- Eiron. May contain traces of irony. |
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Intelligence and RIAA
"Peter Wieck" wrote in message ps.com... On May 14, 9:34 pm, Eeyore wrote: You've lost your edge you know. Never had one. Sometimes "bitter" may be ineptly described as "sharp", but the commander is a one-note instrument badly played by Mr. McCoy. There is nothing there of independent mien. Peter Wieck Wyncote, PA Who is this McCoy that you refer to so often? Is it AJ? If yes, why do you use McCoy? west |
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Intelligence and RIAA
In article i,
"Iain Churches" wrote: "John Byrns" wrote in message ... Iain, you are the one that seem to have got your RIAA curves confused. Perhaps your confusion derives from your phobia of equalizers. Read again what I wrote, notice the phrase "groove amplitude", I was speaking of the amplitude that is cut into the groove. What I said is correct, and since you mention the "physical room on the surface of the disc", it is worth mentioning that it is the "amplitude" that determines how much physical room is required to accommodate a given recording on the surface of the disc. Precisely! And that is the very reason the LF needs to be attenuated when the disc is cut. The RIAA cutting curve, together with variable pitch set by the advance head, allows some 25 mins of a typical symphonic work to be cut on one side. This is quite a contrast to flat response and fixed pitch which allows 8 mins! I have a Westrex cutting amp in my workshop. It's response is almost identical to the RIAA recording curve at: http://www.kolumbus.fi:80/iain.churc...cord_Curve.png At 100Hz about -14dB (ref 1kHz) and at 10kHz some +13dB Come over and take a look if you don't believe me:-) Hi Iain, You are making the wrong measurement, the relevant measurement for this discussion is the input to the combination of the cutting amp and "RIAA" equalizer vs. the amplitude, a.k.a. displacement, of the signal actually cut into the grooves of the LP. I think that if you make this measurement it will give you a different perspective on how LP records actually work. The train is leaving the station, Andre, Arny, Chris, Eiron, and Ian are already on board, you wouldn't want to be left behind, you don't want to have people thinking you have an incomplete knowledge of LP cutting. :-) Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
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Intelligence and RIAA
In article i,
"Iain Churches" wrote: "John Byrns" wrote in message ... Perhaps your confusion derives from your phobia of equalizers. Phobia, what phobia? My version of the three band equaliser which we discussed is up and running, while are you are still huffing and puffing and holding your RIAA plots upside-down:-) Hi Iain, What facilities did you ultimately decide to include in your equalizer? I thought you didn't like the idea of the third band? How did you handle the input and output buffering? Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
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Intelligence and RIAA
In article mvD2i.9294$yy6.2320@trnddc05, "west"
wrote: "Peter Wieck" wrote in message ps.com... On May 14, 9:34 pm, Eeyore wrote: You've lost your edge you know. Never had one. Sometimes "bitter" may be ineptly described as "sharp", but the commander is a one-note instrument badly played by Mr. McCoy. There is nothing there of independent mien. Who is this McCoy that you refer to so often? Is it AJ? If yes, why do you use McCoy? I find it strange that Peter would refer to Andre as "McCoy", which I believe is the pen name used on some of Andre's novels, as Peter much prefers to call Andre "It", in the process demeaning himself more than Andre. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
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Intelligence and RIAA
Ian Bell wrote: Serge Auckland wrote: I've read and re-read John Byrne's arguments and still think he's wrong. Every RIAA amplifier I've ever designed and every one I've measured has a voltage amplitude response that boosts the bass end and cuts the treble end. The RIAA curve calls for a 19.36dB boost at 20Hz, and a 19.95dB cut at 21kHz. Both are relative to 1kHz. Of course it does because it is designed to be fed from a magnetic pickup which has a rising output with frequency, that's what the bass boost/top cut are for No. The output of a magnetic cartridge itself rises @ 6dB/octave wheras the RIAA curve only averages about 4dB/octave. It's not that at all. Graham |
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Intelligence and RIAA
Eiron wrote: A magnetic pickup has a flat response. It converts stylus velocity to voltage. You could consider it as a device that differentiates the stylus displacement, as John Byrns does, but that is not useful so nobody else does it. Indeed. Graham |
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Intelligence and RIAA
west wrote: "Peter Wieck" wrote Eeyore wrote: You've lost your edge you know. Never had one. Sometimes "bitter" may be ineptly described as "sharp", but the commander is a one-note instrument badly played by Mr. McCoy. There is nothing there of independent mien. Peter Wieck Wyncote, PA Who is this McCoy that you refer to so often? Is it AJ? If yes, why do you use McCoy? It'a one of his psedonyms when writing AIUI. Graham |
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Intelligence and RIAA
Poopie snaps at the carrot. Who is this McCoy that you refer to so often? It'a one of his psedonyms when writing AIUI. You're telling one of his sockpuppets about another of his sockpuppets. What does that make you, you dorky donkey? -- Krooscience: The antidote to education, experience, and excellence. |
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Intelligence and RIAA
"George M. Middius" wrote: Poopie snaps at the carrot. Who is this McCoy that you refer to so often? It'a one of his psedonyms when writing AIUI. You're telling one of his sockpuppets about another of his sockpuppets. Nah. You got that wrong. Your 'brain' seems very unwell these days. Graham |
#154
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Intelligence and RIAA
Eeyore wrote:
George M. Middius" wrote: Poopie snaps at the carrot. Who is this McCoy that you refer to so often? It'a one of his psedonyms when writing AIUI. You're telling one of his sockpuppets about another of his sockpuppets. Nah. You got that wrong. Your 'brain' seems very unwell these days. Graham You're a hypocrite and it is your brain needs to be surgically removed and replace with molten lava from Mt. Kilauea. They're offering ticket at discount prices to Hawaii right now, fyi. This window of opportunity will only last you two weeks and I'll even pitch in for your return flight if that's alright.. How about it! |
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Intelligence and RIAA
On May 16, 9:49 am, John Byrns wrote:
In article mvD2i.9294$yy6.2320@trnddc05, "west" wrote: "Peter Wieck" wrote in message ups.com... On May 14, 9:34 pm, Eeyore wrote: You've lost your edge you know. Never had one. Sometimes "bitter" may be ineptly described as "sharp", but the commander is a one-note instrument badly played by Mr. McCoy. There is nothing there of independent mien. Who is this McCoy that you refer to so often? Is it AJ? If yes, why do you use McCoy? I find it strange that Peter would refer to Andre as "McCoy", which I believe is the pen name used on some of Andre's novels, as Peter much prefers to call Andre "It", in the process demeaning himself more than Andre. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ Actually, John, whereas I respect you as an audio/electronics historian of considerable note (and peculiar manner), I find McCoy to be naught but a chimera of pretense and pose of no substance whatsoever. So out of respect for human beings in general, I also choose to consider it to be a farce, a pose, an alias for the purposes of venting, not for any activity of substance. True, there must be someone quite clever behind it... but I seriously doubt that the persona we observe here is anything at all like that actual individual. So, whereas I may not *like* you, I must respect you. McCoy I neither like nor dislike as I do not believe there is an actual "there" to deserve such efforts. Tweaking it is great fun, however. Peter Wieck Wyncote, PA |
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Intelligence and RIAA
George M. Middius cmndr _ george @ comcast . net wrote:
Poopie snaps at the carrot. What does that make you, you dorky donkey? Seems to me that Poopie Stevenson's problem stems precisely from the fact that he is a whole dork short of being one half of an exotic dancer & donkey act. So he became a sound-man for other people's public perversions instead and has resented it ever since, forty long years. Poopie is only Eeyore's bray; the rest of him is mule. Andre Jute Dispensing today |
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Intelligence and RIAA
On May 16, 8:49 am, John Byrns wrote:
In article mvD2i.9294$yy6.2320@trnddc05, "west" wrote: "Peter Wieck" wrote in message ups.com... On May 14, 9:34 pm, Eeyore wrote: You've lost your edge you know. Never had one. Sometimes "bitter" may be ineptly described as "sharp", but the commander is a one-note instrument badly played by Mr. McCoy. There is nothing there of independent mien. Who is this McCoy that you refer to so often? Is it AJ? If yes, why do you use McCoy? I find it strange that Peter would refer to Andre as "McCoy", which I believe is the pen name used on some of Andre's novels, as Peter much prefers to call Andre "It", in the process demeaning himself more than Andre. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ 'Scuse if I stutter, the connection is a bit wonkey lately at the DSL switch across the street. John: As it happens, I respect you as an audio/electronic historian of considerable knowledge (and peculiar behavior). It is my considered opinion that McCoy is a chimera of pretense and pose and not any sort of reality. Put another way, I do agree that there is a clever individual behind the smoke and mirrors, but that the persona displayed here is an alias, an empty costume and not any sort of reality, created only for the purpose of venting its maker's frustrations and hiding its limitations. Put another way, I may not like you, but I do have to respect you. McCoy I neither like nor dislike, and certainly do not respect. There is not enough substance, no "there" there worthy of such efforts. But tweaking it is good great fun. Peter Wieck Wyncote, PA |
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Intelligence and RIAA
Arny Krueger a scris: The Middiot had an. The Middiot out here and raving coneheads, and downhill rapidly there. Now, he take credit completely destroying once-vibrant Usenet group with endless spew cryptic mutterings. I've been trying out this new Krooglish decoder. Arnie makes much more sense when you disregard every thid word he babbles. |
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Intelligence and RIAA
Clyde Slick said: I've been trying out this new Krooglish decoder. Arnie makes much more sense when you disregard every thid word he babbles. Is that the one based on the new eco-friendly sewage treatment system? More nitrogen and less oxygen allows for slower disintegration of fecal matter. Just what Arnii needs. ;-) -- Krooscience: The antidote to education, experience, and excellence. |
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Intelligence and RIAA/cycling and fitness.
"Patrick Turner" wrote in message ... Keith G wrote: snip, 60 eh? - I'm 60 *tomorrow*!! :-) Look, I lied a bit. I have 2 months to go before 60 arrives. I feel 30 most days You're lucky - I barely get to feel more than a couple a month.... |
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