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#282
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Hafler (the first MOSFET? I don't think so)
On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote: On Tue, 06 Jan 2004 13:17:05 GMT, wrote: Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My mind is really rusty (the 60's you know), but I think they were the 7500 and 8500 or so. That's correct, they were demonstration pieces for Hitachi FETs. Soundcraftsmen might have also predated the Hafler with its MA5502 and was concurrent with the Hitachi 8500 (both started in 1977). I'm not 100% positive that it was a MOSFET amp though, because I can't find any confirmation of this. My old Soundcraftsmen brochures were lost in a move. Anyone know for sure? |
#283
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Hafler (the first MOSFET? I don't think so)
On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote: On Tue, 06 Jan 2004 13:17:05 GMT, wrote: Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My mind is really rusty (the 60's you know), but I think they were the 7500 and 8500 or so. That's correct, they were demonstration pieces for Hitachi FETs. Soundcraftsmen might have also predated the Hafler with its MA5502 and was concurrent with the Hitachi 8500 (both started in 1977). I'm not 100% positive that it was a MOSFET amp though, because I can't find any confirmation of this. My old Soundcraftsmen brochures were lost in a move. Anyone know for sure? |
#284
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Amplifiers (was: Hafler)
"Sockpuppet Yustabe" said:
I assume you are talking about Cary single ended power amps. Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. The distortion in a tube guitar amp comes from the preamp section, not from the power amp. Umm, not entirely. There's a complex interaction between the speaker & housing, the output transformer and the usually low to zero NFB, which provides the certain brand's sound. Hence the need for power soaks in practicing and studio use. -- Sander deWaal Vacuum Audio Consultancy |
#285
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Amplifiers (was: Hafler)
"Sockpuppet Yustabe" said:
I assume you are talking about Cary single ended power amps. Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. The distortion in a tube guitar amp comes from the preamp section, not from the power amp. Umm, not entirely. There's a complex interaction between the speaker & housing, the output transformer and the usually low to zero NFB, which provides the certain brand's sound. Hence the need for power soaks in practicing and studio use. -- Sander deWaal Vacuum Audio Consultancy |
#286
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Amplifiers (was: Hafler)
"Sockpuppet Yustabe" said:
I assume you are talking about Cary single ended power amps. Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. The distortion in a tube guitar amp comes from the preamp section, not from the power amp. Umm, not entirely. There's a complex interaction between the speaker & housing, the output transformer and the usually low to zero NFB, which provides the certain brand's sound. Hence the need for power soaks in practicing and studio use. -- Sander deWaal Vacuum Audio Consultancy |
#287
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Amplifiers
In rec.audio.tech Sander deWaal wrote:
"Sockpuppet Yustabe" said: I assume you are talking about Cary single ended power amps. Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. Should have learned sooner as it's not rocket science. |
#288
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Amplifiers
In rec.audio.tech Sander deWaal wrote:
"Sockpuppet Yustabe" said: I assume you are talking about Cary single ended power amps. Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. Should have learned sooner as it's not rocket science. |
#289
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Amplifiers
In rec.audio.tech Sander deWaal wrote:
"Sockpuppet Yustabe" said: I assume you are talking about Cary single ended power amps. Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. Should have learned sooner as it's not rocket science. |
#291
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Amplifiers
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#292
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Amplifiers
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#293
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Amplifiers
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#294
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Amplifiers
In rec.audio.tech Sander deWaal wrote:
said: Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. Should have learned sooner as it's not rocket science. Yup, in the old days, they wouldn't have sold a single one. They might have sold a few, but wouldn't have been around to sell more. Things should still be that way, alas.............. |
#295
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Amplifiers
In rec.audio.tech Sander deWaal wrote:
said: Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. Should have learned sooner as it's not rocket science. Yup, in the old days, they wouldn't have sold a single one. They might have sold a few, but wouldn't have been around to sell more. Things should still be that way, alas.............. |
#296
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Amplifiers
In rec.audio.tech Sander deWaal wrote:
said: Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. Should have learned sooner as it's not rocket science. Yup, in the old days, they wouldn't have sold a single one. They might have sold a few, but wouldn't have been around to sell more. Things should still be that way, alas.............. |
#297
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Amplifiers
In rec.audio.tech Sander deWaal wrote:
said: Having some experience with Carys, while they might have some interesting sonical attributes, their concept sometimes sucks. They're running those poor 300Bs over their plate power ratings, and 1200 uF right at the cathode of a Gz37 rectifier isn't healthy, either. They seemed to have learned since those days, however. Should have learned sooner as it's not rocket science. Yup, in the old days, they wouldn't have sold a single one. They might have sold a few, but wouldn't have been around to sell more. Things should still be that way, alas.............. |
#298
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Hafler (the first MOSFET? I don't think so)
dave weil wrote:
On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart Pinkerton) wrote: On Tue, 06 Jan 2004 13:17:05 GMT, wrote: Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My mind is really rusty (the 60's you know), but I think they were the 7500 and 8500 or so. That's correct, they were demonstration pieces for Hitachi FETs. Soundcraftsmen might have also predated the Hafler with its MA5502 and was concurrent with the Hitachi 8500 (both started in 1977). I'm not 100% positive that it was a MOSFET amp though, because I can't find any confirmation of this. My old Soundcraftsmen brochures were lost in a move. Anyone know for sure? As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I think these amps also had switching power supplies. I clearly remember worrying how the upcoming amplifiers would sound with my newly purchased ADS L500 speakers. That was when I had a lot less to worry about. Several years later I purchased a Hafler DH200 and found out that a well designed amp sounds good with good speakers regardless of the design philosophy. (Hey, isn't this where this thread started???) |
#299
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Hafler (the first MOSFET? I don't think so)
dave weil wrote:
On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart Pinkerton) wrote: On Tue, 06 Jan 2004 13:17:05 GMT, wrote: Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My mind is really rusty (the 60's you know), but I think they were the 7500 and 8500 or so. That's correct, they were demonstration pieces for Hitachi FETs. Soundcraftsmen might have also predated the Hafler with its MA5502 and was concurrent with the Hitachi 8500 (both started in 1977). I'm not 100% positive that it was a MOSFET amp though, because I can't find any confirmation of this. My old Soundcraftsmen brochures were lost in a move. Anyone know for sure? As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I think these amps also had switching power supplies. I clearly remember worrying how the upcoming amplifiers would sound with my newly purchased ADS L500 speakers. That was when I had a lot less to worry about. Several years later I purchased a Hafler DH200 and found out that a well designed amp sounds good with good speakers regardless of the design philosophy. (Hey, isn't this where this thread started???) |
#300
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Hafler (the first MOSFET? I don't think so)
dave weil wrote:
On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart Pinkerton) wrote: On Tue, 06 Jan 2004 13:17:05 GMT, wrote: Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My mind is really rusty (the 60's you know), but I think they were the 7500 and 8500 or so. That's correct, they were demonstration pieces for Hitachi FETs. Soundcraftsmen might have also predated the Hafler with its MA5502 and was concurrent with the Hitachi 8500 (both started in 1977). I'm not 100% positive that it was a MOSFET amp though, because I can't find any confirmation of this. My old Soundcraftsmen brochures were lost in a move. Anyone know for sure? As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I think these amps also had switching power supplies. I clearly remember worrying how the upcoming amplifiers would sound with my newly purchased ADS L500 speakers. That was when I had a lot less to worry about. Several years later I purchased a Hafler DH200 and found out that a well designed amp sounds good with good speakers regardless of the design philosophy. (Hey, isn't this where this thread started???) |
#301
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Hafler (the first MOSFET? I don't think so)
dave weil wrote:
On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart Pinkerton) wrote: On Tue, 06 Jan 2004 13:17:05 GMT, wrote: Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My mind is really rusty (the 60's you know), but I think they were the 7500 and 8500 or so. That's correct, they were demonstration pieces for Hitachi FETs. Soundcraftsmen might have also predated the Hafler with its MA5502 and was concurrent with the Hitachi 8500 (both started in 1977). I'm not 100% positive that it was a MOSFET amp though, because I can't find any confirmation of this. My old Soundcraftsmen brochures were lost in a move. Anyone know for sure? As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I think these amps also had switching power supplies. I clearly remember worrying how the upcoming amplifiers would sound with my newly purchased ADS L500 speakers. That was when I had a lot less to worry about. Several years later I purchased a Hafler DH200 and found out that a well designed amp sounds good with good speakers regardless of the design philosophy. (Hey, isn't this where this thread started???) |
#302
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Hafler (the first MOSFET? I don't think so)
"wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. I think these amps also had switching power supplies. Not AFAIK, mine has a two voltage levels for each rail if that's what you mean, but it's not switch mode. TonyP. |
#303
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Hafler (the first MOSFET? I don't think so)
"wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. I think these amps also had switching power supplies. Not AFAIK, mine has a two voltage levels for each rail if that's what you mean, but it's not switch mode. TonyP. |
#304
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Hafler (the first MOSFET? I don't think so)
"wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. I think these amps also had switching power supplies. Not AFAIK, mine has a two voltage levels for each rail if that's what you mean, but it's not switch mode. TonyP. |
#305
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Hafler (the first MOSFET? I don't think so)
"wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. I think these amps also had switching power supplies. Not AFAIK, mine has a two voltage levels for each rail if that's what you mean, but it's not switch mode. TonyP. |
#306
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Hafler (the first MOSFET? I don't think so)
On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote: "wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. Actually, Siliconix invented the VFET, but theirs were mostly for RF and small signal use, audio band power VFETs came later from both Sony and Hitachi. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#307
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Hafler (the first MOSFET? I don't think so)
On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote: "wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. Actually, Siliconix invented the VFET, but theirs were mostly for RF and small signal use, audio band power VFETs came later from both Sony and Hitachi. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#308
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Hafler (the first MOSFET? I don't think so)
On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote: "wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. Actually, Siliconix invented the VFET, but theirs were mostly for RF and small signal use, audio band power VFETs came later from both Sony and Hitachi. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#309
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Hafler (the first MOSFET? I don't think so)
On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote: "wß" wrote in message ... As I recall, Sony, yech, was the first to market an integrated amplifier, at least in the U.S., utilizing MOSFET outputs. It would have been late 1975 or early 1976. I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. Actually, Siliconix invented the VFET, but theirs were mostly for RF and small signal use, audio band power VFETs came later from both Sony and Hitachi. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#310
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Hafler (the first MOSFET? I don't think so)
"Tony Pearce" said:
I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77 MOSFETS. A giant beast, and those transistors looked like 2N3055s on steroids (twice the size of a TO-3) . Cool! -- Sander deWaal Vacuum Audio Consultancy |
#311
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Hafler (the first MOSFET? I don't think so)
"Tony Pearce" said:
I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77 MOSFETS. A giant beast, and those transistors looked like 2N3055s on steroids (twice the size of a TO-3) . Cool! -- Sander deWaal Vacuum Audio Consultancy |
#312
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Hafler (the first MOSFET? I don't think so)
"Tony Pearce" said:
I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77 MOSFETS. A giant beast, and those transistors looked like 2N3055s on steroids (twice the size of a TO-3) . Cool! -- Sander deWaal Vacuum Audio Consultancy |
#313
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Hafler (the first MOSFET? I don't think so)
"Tony Pearce" said:
I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you overlook the device construction difference, then I think Sony were the first to use high power FET's in a power amp. Sony invented the VFET, the Hitachi power MosFET's came later. IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77 MOSFETS. A giant beast, and those transistors looked like 2N3055s on steroids (twice the size of a TO-3) . Cool! -- Sander deWaal Vacuum Audio Consultancy |
#314
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Hafler
On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote: A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny and Stew. Nice to see you clarifying why you are universally known as 'Moron'. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#315
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Hafler
On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote: A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny and Stew. Nice to see you clarifying why you are universally known as 'Moron'. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#316
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Hafler
On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote: A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny and Stew. Nice to see you clarifying why you are universally known as 'Moron'. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#317
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Hafler
On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote: A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny and Stew. Nice to see you clarifying why you are universally known as 'Moron'. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
#318
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Hafler
Stewart Pinkerton a écrit :
On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein" wrote: A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny and Stew. Nice to see you clarifying why you are universally known as 'Moron'. Hey, Pinky Warrior give him a chance. |
#319
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Hafler
Stewart Pinkerton a écrit :
On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein" wrote: A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny and Stew. Nice to see you clarifying why you are universally known as 'Moron'. Hey, Pinky Warrior give him a chance. |
#320
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Hafler
Stewart Pinkerton a écrit :
On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein" wrote: A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny and Stew. Nice to see you clarifying why you are universally known as 'Moron'. Hey, Pinky Warrior give him a chance. |
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