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#41
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"Tony" wrote in message
On Sat, 4 Sep 2004 14:35:48 -0400, "Arny Krueger" wrote: "Mike Rivers" wrote in message news:znr1094259452k@trad In article writes: Are you suggesting that they select the tempcos as well? or that it always just happens that if a resistor is very close to its design value, it automatically has a tighter tempco? Or that the makers lie about the specs? Or have you just managed to find 0.1% resistors with bad tempcos? I have never been concerned with "tempcos" (I assume that's Australian for temperature coefficient) for a device that will always be used at room temperature. Not to mention the fact that if the components of an attenuator are kept in reasonbly close thermal contact with each other, their ratio, which sets the attenuation, will remain the same, even if their values change with temperature. That's very true, and certainly for the mic attenuator and many other applications, tempcos would not be an issue. But my comment was directed at Mike's assertion that 0.1% resistors were simply selected from 1% production, which I still don't believe to be true. I agree - AFAIK 0.1% resistors are cut from nicer *cloth*, figuratively speaking. |
#42
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"Tony" wrote in message
On Sat, 4 Sep 2004 14:35:48 -0400, "Arny Krueger" wrote: "Mike Rivers" wrote in message news:znr1094259452k@trad In article writes: Are you suggesting that they select the tempcos as well? or that it always just happens that if a resistor is very close to its design value, it automatically has a tighter tempco? Or that the makers lie about the specs? Or have you just managed to find 0.1% resistors with bad tempcos? I have never been concerned with "tempcos" (I assume that's Australian for temperature coefficient) for a device that will always be used at room temperature. Not to mention the fact that if the components of an attenuator are kept in reasonbly close thermal contact with each other, their ratio, which sets the attenuation, will remain the same, even if their values change with temperature. That's very true, and certainly for the mic attenuator and many other applications, tempcos would not be an issue. But my comment was directed at Mike's assertion that 0.1% resistors were simply selected from 1% production, which I still don't believe to be true. I agree - AFAIK 0.1% resistors are cut from nicer *cloth*, figuratively speaking. |
#43
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"Don Pearce" wrote in message
You are right - it certainly isn't true. If it were, all resistors other than the very best would have a bimodal distribution - a hole in the middle where the best ones had been removed. They don't. Typically resistor tolerance describes the width of the three-sigma level of distribution, and that distribution tends to be normal. In other words, resistors are "made" to the appropriate tolerance. You've obviously never bought any parts from Digi-Key! ;-) |
#44
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"Don Pearce" wrote in message
You are right - it certainly isn't true. If it were, all resistors other than the very best would have a bimodal distribution - a hole in the middle where the best ones had been removed. They don't. Typically resistor tolerance describes the width of the three-sigma level of distribution, and that distribution tends to be normal. In other words, resistors are "made" to the appropriate tolerance. You've obviously never bought any parts from Digi-Key! ;-) |
#46
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#47
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Mike Rivers wrote:
Is there any tradeoff between temperature coefficient and quiescent noise? That is, if you want a low TC, might you have to accept a resistor made of a material, or of a construction method that generates more noise than one with a higher (but still acceptable) TC? None that I know of. Excess noise ( over and above thermal ) is material related for sure but I'm unaware of any tempco/noise correlation. An array with resistors on a substrate would certainly be a good approach to keep whatever you started out with tracking together. Neve used this approach for the custom gain setting R packs that they have used for balanced line ins. Graham |
#48
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Mike Rivers wrote:
Is there any tradeoff between temperature coefficient and quiescent noise? That is, if you want a low TC, might you have to accept a resistor made of a material, or of a construction method that generates more noise than one with a higher (but still acceptable) TC? None that I know of. Excess noise ( over and above thermal ) is material related for sure but I'm unaware of any tempco/noise correlation. An array with resistors on a substrate would certainly be a good approach to keep whatever you started out with tracking together. Neve used this approach for the custom gain setting R packs that they have used for balanced line ins. Graham |
#49
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"Mike Rivers" Is there any tradeoff between temperature coefficient and quiescent noise? ** Resistors of all types have exactly the same thermal self noise level. If they did not, then one with more thermal noise could deliver power to one with less and defy the principle of conservation of energy. NB: The ****wit, featherless, context snipping, lying parrot will fall right of his perch trying to work this one out. Squawk ..... squawk ... squawk ..... ............. Phil |
#50
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"Mike Rivers" Is there any tradeoff between temperature coefficient and quiescent noise? ** Resistors of all types have exactly the same thermal self noise level. If they did not, then one with more thermal noise could deliver power to one with less and defy the principle of conservation of energy. NB: The ****wit, featherless, context snipping, lying parrot will fall right of his perch trying to work this one out. Squawk ..... squawk ... squawk ..... ............. Phil |
#51
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#52
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#53
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"Mike Rivers" Phil Allison I asked: Is there any tradeoff between temperature coefficient and quiescent noise? And Phil Allison answered: ** Resistors of all types have exactly the same thermal self noise level. Did you see anything in my question about thermal noise? ** More ****wit parrot ****e: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Do you think there are no other sources of noise from a resistor other than what results from molecules moving around at different rates depending on the temperature? ** Not in the quiescent condition. Once again, Phil has reduced the question.. ** That was no question - that was another ****wit parrot RED HERRING !!! Same parrot's trick he always uses to change the subject. If you want to talk about something different, start a new thread. ** Like Mike Rivers never does himself. He just snips the old context out of site and slips in a new one. But there's no need to regurgitate information that, while valid, is an incomplete answer to a question. ** More putrid ****wit parrot ****e. And particularly to do so in an arrogant and insulting manner. " ** NB: The ****wit, featherless, context snipping, lying parrot will fall right of his perch trying to work this one out. Squawk ..... squawk ... squawk ..... " Where is the insult ???? I just posted the facts. ............. Phil |
#54
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"Mike Rivers" Phil Allison I asked: Is there any tradeoff between temperature coefficient and quiescent noise? And Phil Allison answered: ** Resistors of all types have exactly the same thermal self noise level. Did you see anything in my question about thermal noise? ** More ****wit parrot ****e: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Do you think there are no other sources of noise from a resistor other than what results from molecules moving around at different rates depending on the temperature? ** Not in the quiescent condition. Once again, Phil has reduced the question.. ** That was no question - that was another ****wit parrot RED HERRING !!! Same parrot's trick he always uses to change the subject. If you want to talk about something different, start a new thread. ** Like Mike Rivers never does himself. He just snips the old context out of site and slips in a new one. But there's no need to regurgitate information that, while valid, is an incomplete answer to a question. ** More putrid ****wit parrot ****e. And particularly to do so in an arrogant and insulting manner. " ** NB: The ****wit, featherless, context snipping, lying parrot will fall right of his perch trying to work this one out. Squawk ..... squawk ... squawk ..... " Where is the insult ???? I just posted the facts. ............. Phil |
#55
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Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... I suspect an Assilon debate shortly about what 'quiescent' is. I'm sure he's heard of excess noise caused by current flow. Graham |
#56
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Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... I suspect an Assilon debate shortly about what 'quiescent' is. I'm sure he's heard of excess noise caused by current flow. Graham |
#57
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"Pooh Bear" Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... ** Resistors are hum free as well - in the quiescent state. I suspect an Assilon debate shortly about what 'quiescent' is. ** The context here is a resistive attenuator for mic signals - so "quiescent" means ( in context) with no voltage applied. Just you watch while some *******head parrot** or **incontinent bear** pretends that some other context was intended. I'm sure he's heard of excess noise caused by current flow. ** Told ya ..... ............. Phil |
#58
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"Pooh Bear" Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... ** Resistors are hum free as well - in the quiescent state. I suspect an Assilon debate shortly about what 'quiescent' is. ** The context here is a resistive attenuator for mic signals - so "quiescent" means ( in context) with no voltage applied. Just you watch while some *******head parrot** or **incontinent bear** pretends that some other context was intended. I'm sure he's heard of excess noise caused by current flow. ** Told ya ..... ............. Phil |
#59
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Phil Allison wrote:
"Pooh Bear" Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... ** Resistors are hum free as well - in the quiescent state. LOL ! I used to get told off for humming ( in that way ) by one of my old colleagues. I suspect an Assilon debate shortly about what 'quiescent' is. ** The context here is a resistive attenuator for mic signals - so "quiescent" means ( in context) with no voltage applied. Ahhh..... but what is the point of an attenuator if there is no voltage ( current ) present ? QED. No voltage means no need for attenuator ! It's acknowledged that a DC 'bias' on resistors causes excess noise. ( don't mean phantom power here - just in general ) . Agreed ? Excess noise due to DC current is widely quoted and easily measured in uV/V .. ( AC noise / DC bias Voltage ). Note - the noise mechanism is current but it's easier to measure Volts as the variable. Now - what is AC but 'moving DC' ? Therefore an AC current ( the signal ) *will* create excess noise in resistors. Maybe not much - but it's there. Just you watch while some *******head parrot** or **incontinent bear** pretends that some other context was intended. I'm sure he's heard of excess noise caused by current flow. ** Told ya ..... Uhuh - it's so though isn't it ? Gotcha ! ;-) Graham |
#60
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Phil Allison wrote:
"Pooh Bear" Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... ** Resistors are hum free as well - in the quiescent state. LOL ! I used to get told off for humming ( in that way ) by one of my old colleagues. I suspect an Assilon debate shortly about what 'quiescent' is. ** The context here is a resistive attenuator for mic signals - so "quiescent" means ( in context) with no voltage applied. Ahhh..... but what is the point of an attenuator if there is no voltage ( current ) present ? QED. No voltage means no need for attenuator ! It's acknowledged that a DC 'bias' on resistors causes excess noise. ( don't mean phantom power here - just in general ) . Agreed ? Excess noise due to DC current is widely quoted and easily measured in uV/V .. ( AC noise / DC bias Voltage ). Note - the noise mechanism is current but it's easier to measure Volts as the variable. Now - what is AC but 'moving DC' ? Therefore an AC current ( the signal ) *will* create excess noise in resistors. Maybe not much - but it's there. Just you watch while some *******head parrot** or **incontinent bear** pretends that some other context was intended. I'm sure he's heard of excess noise caused by current flow. ** Told ya ..... Uhuh - it's so though isn't it ? Gotcha ! ;-) Graham |
#61
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Pooh Bear wrote:
Phil Allison wrote: ** Resistors are hum free as well - in the quiescent state. .... I suspect an Assilon debate shortly about what 'quiescent' is. It means "without solder". |
#62
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Pooh Bear wrote:
Phil Allison wrote: ** Resistors are hum free as well - in the quiescent state. .... I suspect an Assilon debate shortly about what 'quiescent' is. It means "without solder". |
#63
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On Sun, 05 Sep 2004 23:14:53 -0700, S O'Neill
wrote: 'quiescent' It means "without solder". Whoah! I was afraid it had some disturbing sexual meaning about having lead in your pencil. Chris Hornbeck |
#64
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On Sun, 05 Sep 2004 23:14:53 -0700, S O'Neill
wrote: 'quiescent' It means "without solder". Whoah! I was afraid it had some disturbing sexual meaning about having lead in your pencil. Chris Hornbeck |
#65
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"Pooh Bear" Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... ** Resistors are hum free as well - in the quiescent state. LOL ! I used to get told off for humming ( in that way ) by one of my old colleagues. I suspect an Allison debate shortly about what 'quiescent' is. ** The context here is a resistive attenuator for mic signals - so "quiescent" means ( in context) with no voltage applied. Ahhh..... ** Pooh just let a big one go ............ phew it stinks !! but what is the point of an attenuator if there is no voltage ( current ) present ? QED. No voltage means no need for attenuator ! ** He says - again ignoring the context. Therefore an AC current ( the signal ) *will* create excess noise in resistors. Maybe not much - but it's there. ** Pedantic twaddle - plus still ignores the context "quiescent". Just you watch while some *******head parrot** or **incontinent bear** pretends that some other context was intended. I'm sure he's heard of excess noise caused by current flow. ** Told ya ..... Uhuh - it's so though isn't it ? ** What is so ?? That Excreta Bear is posturing pommy prick is in no doubt. .............. Phil |
#66
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"Pooh Bear" Phil Allison wrote: Quiescent noise of a resistor = its thermal noise. Thermal noise depends on the resistance value alone. Hmmmm.... ** Resistors are hum free as well - in the quiescent state. LOL ! I used to get told off for humming ( in that way ) by one of my old colleagues. I suspect an Allison debate shortly about what 'quiescent' is. ** The context here is a resistive attenuator for mic signals - so "quiescent" means ( in context) with no voltage applied. Ahhh..... ** Pooh just let a big one go ............ phew it stinks !! but what is the point of an attenuator if there is no voltage ( current ) present ? QED. No voltage means no need for attenuator ! ** He says - again ignoring the context. Therefore an AC current ( the signal ) *will* create excess noise in resistors. Maybe not much - but it's there. ** Pedantic twaddle - plus still ignores the context "quiescent". Just you watch while some *******head parrot** or **incontinent bear** pretends that some other context was intended. I'm sure he's heard of excess noise caused by current flow. ** Told ya ..... Uhuh - it's so though isn't it ? ** What is so ?? That Excreta Bear is posturing pommy prick is in no doubt. .............. Phil |
#67
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#68
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#69
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"Mike Rivers" = the biggest, stinking charlatan on this NG Phil Allison Did you see anything in my question about thermal noise? Quiescent noise of a resistor = its thermal noise. Not entirely. ** More ****wit parrot ****e. Thermal noise depends on the resistance value alone. I'll go along with that, but what about other sources of noise in a component, which has more than just pure resistance? ** More ****wit parrot ****. Do you think there are no other sources of noise from a resistor other than what results from molecules moving around at different rates depending on the temperature? ** More ****wit parrot ****. ** Not in the quiescent condition. Again, you're obscuring application with pure theory. ** More ****wit parrot **** - quiescent was * YOUR * word. A resistor connected to nothing is of no use to anyone but a pedantic who wants to calculate its theoretical noise. To a circuit designer, "quiescent" can (and often does) mean "in the circuit, with known terminations, powered up, but with no input signal". ** So ??????. Where is the insult ???? The way you stated facts with no concern for how those facts relate to the subject. ** More ****wit parrot ****. Folks, we have to feed Phil's ego here now and then. ** No need to feed the ****wit parrot anything - except a nice dose of arsenic. Squawk ... squawk ..... squawk ....... puke ....puke ....fart fart .... ............... Phil |
#70
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"Mike Rivers" = the biggest, stinking charlatan on this NG Phil Allison Did you see anything in my question about thermal noise? Quiescent noise of a resistor = its thermal noise. Not entirely. ** More ****wit parrot ****e. Thermal noise depends on the resistance value alone. I'll go along with that, but what about other sources of noise in a component, which has more than just pure resistance? ** More ****wit parrot ****. Do you think there are no other sources of noise from a resistor other than what results from molecules moving around at different rates depending on the temperature? ** More ****wit parrot ****. ** Not in the quiescent condition. Again, you're obscuring application with pure theory. ** More ****wit parrot **** - quiescent was * YOUR * word. A resistor connected to nothing is of no use to anyone but a pedantic who wants to calculate its theoretical noise. To a circuit designer, "quiescent" can (and often does) mean "in the circuit, with known terminations, powered up, but with no input signal". ** So ??????. Where is the insult ???? The way you stated facts with no concern for how those facts relate to the subject. ** More ****wit parrot ****. Folks, we have to feed Phil's ego here now and then. ** No need to feed the ****wit parrot anything - except a nice dose of arsenic. Squawk ... squawk ..... squawk ....... puke ....puke ....fart fart .... ............... Phil |
#71
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Ya know, if absolutely No One responded to "Phil", and everyone killfiled it,
it basically would cease to exist. In case it hasn't occurred to you, "Phil" is actually just a computer virus or fuzzy logic bot planted on this newsgroup by some techo guys in a lab in Cambridge with a weird sense of humor. Let's try a test to see what happens if we eliminate input to the bot and ignore its output. I'm guessing its internal feedback circuits will mount to such a high current that it may just go Poof! How Rod Serling-esque! Regards, Ty Ford -- Ty Ford's equipment reviews, audio samples, rates and other audiocentric stuff are at www.tyford.com |
#72
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Ya know, if absolutely No One responded to "Phil", and everyone killfiled it,
it basically would cease to exist. In case it hasn't occurred to you, "Phil" is actually just a computer virus or fuzzy logic bot planted on this newsgroup by some techo guys in a lab in Cambridge with a weird sense of humor. Let's try a test to see what happens if we eliminate input to the bot and ignore its output. I'm guessing its internal feedback circuits will mount to such a high current that it may just go Poof! How Rod Serling-esque! Regards, Ty Ford -- Ty Ford's equipment reviews, audio samples, rates and other audiocentric stuff are at www.tyford.com |
#73
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"Ty Ford" ** What do you do Mr Ford ? Are you not a festering pimple on the arse of the audio industry who operates an illegal marketing scam ? Do you not pretend to be a technical reviewer and independent advice giver when you are nothing of the sort ? Do you not spread, via the net, the very misinformation that makers dare not use in their published advertisements for fear of legal action ? Do you not prey on the irrational beliefs and fears of the gullible to make a living ? Are you not a professional charlatan ????? No wonder you want rid of anyone like me. ........... Phil |
#74
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"Ty Ford" ** What do you do Mr Ford ? Are you not a festering pimple on the arse of the audio industry who operates an illegal marketing scam ? Do you not pretend to be a technical reviewer and independent advice giver when you are nothing of the sort ? Do you not spread, via the net, the very misinformation that makers dare not use in their published advertisements for fear of legal action ? Do you not prey on the irrational beliefs and fears of the gullible to make a living ? Are you not a professional charlatan ????? No wonder you want rid of anyone like me. ........... Phil |
#75
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Chris Hornbeck wrote:
On Sun, 05 Sep 2004 23:14:53 -0700, S O'Neill wrote: 'quiescent' It means "without solder". Whoah! I was afraid it had some disturbing sexual meaning about having lead in your pencil. Uhhh ? Ohhh.... maybe I get it. The girls at a local school used to call a friend of mine 'pencil' for a certain physical attribute. Well.... you know that environmental legislation is moving towards 'lead free solder' ? Maybe we'll see lead free pencils soon ? ;-) Graham |
#76
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Chris Hornbeck wrote:
On Sun, 05 Sep 2004 23:14:53 -0700, S O'Neill wrote: 'quiescent' It means "without solder". Whoah! I was afraid it had some disturbing sexual meaning about having lead in your pencil. Uhhh ? Ohhh.... maybe I get it. The girls at a local school used to call a friend of mine 'pencil' for a certain physical attribute. Well.... you know that environmental legislation is moving towards 'lead free solder' ? Maybe we'll see lead free pencils soon ? ;-) Graham |
#77
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On Tue, 07 Sep 2004 02:20:59 +0100, Pooh Bear
wrote: Whoah! I was afraid it had some disturbing sexual meaning about having lead in your pencil. Uhhh ? Ohhh.... maybe I get it. Would have been a lot funnier if I'd gotten it right. Should read "putting lead in your pencil". Sorry. Chris Hornbeck |
#78
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On Tue, 07 Sep 2004 02:20:59 +0100, Pooh Bear
wrote: Whoah! I was afraid it had some disturbing sexual meaning about having lead in your pencil. Uhhh ? Ohhh.... maybe I get it. Would have been a lot funnier if I'd gotten it right. Should read "putting lead in your pencil". Sorry. Chris Hornbeck |
#79
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On Mon, 6 Sep 2004 20:12:26 -0400, Ty Ford
wrote: Ya know, if absolutely No One responded to "Phil", and everyone killfiled it, it basically would cease to exist. Easy for you to say. You got a nickname; all I get is "Hornbeck". Kind of a funny name I guess, but not at all the same thing as a nickname. But I refuse to respond to the AI until I get a nickname. And another shrubbery. In case it hasn't occurred to you, "Phil" is actually just a computer virus or fuzzy logic bot planted on this newsgroup by some techo guys in a lab in Cambridge with a weird sense of humor. You're starting to scare me now. How Rod Serling-esque! Or even Bruce Sterling or William Gibson. Now you're really scaring me. Chris Hornbeck |
#80
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On Mon, 6 Sep 2004 20:12:26 -0400, Ty Ford
wrote: Ya know, if absolutely No One responded to "Phil", and everyone killfiled it, it basically would cease to exist. Easy for you to say. You got a nickname; all I get is "Hornbeck". Kind of a funny name I guess, but not at all the same thing as a nickname. But I refuse to respond to the AI until I get a nickname. And another shrubbery. In case it hasn't occurred to you, "Phil" is actually just a computer virus or fuzzy logic bot planted on this newsgroup by some techo guys in a lab in Cambridge with a weird sense of humor. You're starting to scare me now. How Rod Serling-esque! Or even Bruce Sterling or William Gibson. Now you're really scaring me. Chris Hornbeck |
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