I do. Not because of the gluing, though, but rather the simple act of pulling the stylus and putting it back in.
"Don't let me be misunderstood" (a'm nothing but an animal)
Now, that was a good blow.😱
After half an hour been lying down half unconscious, I called my lawyer and he told me there is little I can do to defend my case in the court. It might be beneficial though if I could formulate a text listing my strong and weak points. So, I thought of the following:
Fact 1: I have removed the stylus assy 2-3 times and put it back- in from the time of purchase till the glue application.
Fact 2: I have pictures taken just before the glue application showing good fit of the stylus assy.
Hypothesis 1: SY’s reasoning is based upon his experience from analogous cases.
Fact 3: I have no statistical or theoretical proof to provide for to reject SY’s reasoning.
Statement 1: Therefore SY’s reasoning remains a logical possibility-thus valid- until any opposing proof is presented.
Fact 4: All the information and data that I have provided so far are the outcome of my experimental set-up, based on my experimental methods working on the specific piece of the cartridge I own. Indeed I have not as yet communicated in this forum the complete list of equipment, nor reported with adequate details the methodology of the experimental work, on the basis that this work is still in progress and under the initial thought that some participants of the forum may find it somehow an interesting subject.
Statement 2: My involvement in this experiment is based on my desire to expand my knowledge into the technical aspects of audio reproduction, triggered by other’s information and my own curiosity. Having not enough means (knowledge and capability) to design and manufacture an equipment from the start, I have opted to modify a product that was under my disposal.
Statement 3: I understand and fully respect the fact that said product is designed by competend engineers and manufactured as a mass product.
Statement 4: I do not imply in any ways that the particular cartridge under modification is neither worse nor better than any other cartridge (also any other’s cartridge). This, applies equally to the pre-mod as well as to the after mod condition of my cartridge.
Statement 5: I have no intention to convince anyone for the validity of my results.
Fact 5: I have presented part of the data on which my expressed opinion is based (as an attachment) into my posts. I have made known that the complete data (recordings) can be asked and will be e-mailed to anyone interested (this is for free) for doing his/her own analysis and draw his/her own conclusions, if any.
Statement 6: I understand that any of my reporting in such a forum is subject to peer review. This is in fact my own wish.
Statement 7: Any statement of mine that seems objectionable or not supported by adequate data, is to be deemed by the participants of this forum as an erroneous one and treated as such. Upon their judgment, it can be ignored altogether. But it would not be treated as an intend from my part to impress or mislead anyone.
Statement 8: Audio is what I can describe as a hobby for me. It helps me enjoy my free time in a pleasant and some times in a beneficial (as the realization of the hobby produces usable equipment) way. It differs from my professional activities in four respects:
A. I do not profit from this.
B. I have to finance it, so I have to target projects capable to fit my pocket-money budget.
C. I am the one who decides on what to do and how far I go with it.
D. The time I spend on it has to take into account my social activities and responsibilities as a father and husband.
Regards
George
Now, that was a good blow.😱
After half an hour been lying down half unconscious, I called my lawyer and he told me there is little I can do to defend my case in the court. It might be beneficial though if I could formulate a text listing my strong and weak points. So, I thought of the following:
Fact 1: I have removed the stylus assy 2-3 times and put it back- in from the time of purchase till the glue application.
Fact 2: I have pictures taken just before the glue application showing good fit of the stylus assy.
Hypothesis 1: SY’s reasoning is based upon his experience from analogous cases.
Fact 3: I have no statistical or theoretical proof to provide for to reject SY’s reasoning.
Statement 1: Therefore SY’s reasoning remains a logical possibility-thus valid- until any opposing proof is presented.
Fact 4: All the information and data that I have provided so far are the outcome of my experimental set-up, based on my experimental methods working on the specific piece of the cartridge I own. Indeed I have not as yet communicated in this forum the complete list of equipment, nor reported with adequate details the methodology of the experimental work, on the basis that this work is still in progress and under the initial thought that some participants of the forum may find it somehow an interesting subject.
Statement 2: My involvement in this experiment is based on my desire to expand my knowledge into the technical aspects of audio reproduction, triggered by other’s information and my own curiosity. Having not enough means (knowledge and capability) to design and manufacture an equipment from the start, I have opted to modify a product that was under my disposal.
Statement 3: I understand and fully respect the fact that said product is designed by competend engineers and manufactured as a mass product.
Statement 4: I do not imply in any ways that the particular cartridge under modification is neither worse nor better than any other cartridge (also any other’s cartridge). This, applies equally to the pre-mod as well as to the after mod condition of my cartridge.
Statement 5: I have no intention to convince anyone for the validity of my results.
Fact 5: I have presented part of the data on which my expressed opinion is based (as an attachment) into my posts. I have made known that the complete data (recordings) can be asked and will be e-mailed to anyone interested (this is for free) for doing his/her own analysis and draw his/her own conclusions, if any.
Statement 6: I understand that any of my reporting in such a forum is subject to peer review. This is in fact my own wish.
Statement 7: Any statement of mine that seems objectionable or not supported by adequate data, is to be deemed by the participants of this forum as an erroneous one and treated as such. Upon their judgment, it can be ignored altogether. But it would not be treated as an intend from my part to impress or mislead anyone.
Statement 8: Audio is what I can describe as a hobby for me. It helps me enjoy my free time in a pleasant and some times in a beneficial (as the realization of the hobby produces usable equipment) way. It differs from my professional activities in four respects:
A. I do not profit from this.
B. I have to finance it, so I have to target projects capable to fit my pocket-money budget.
C. I am the one who decides on what to do and how far I go with it.
D. The time I spend on it has to take into account my social activities and responsibilities as a father and husband.
Regards
George
Attachments
I think you understood my comment in the spirit it was given, but if not, I was merely pointing out that there is more than one variable here, not criticizing your work in any way. I think there's great merit in fixing the stylus assembly firmly into place and, in fact, used cyanoacrylate to do this with my old V15-III back in the day.
3dB is audible in direct comparison, but I suspect not in an informal one where there is a significant time lapse between auditions. One of the banes of removable styli is that they do not always return to a perfectly repeatable position, so the level difference is very plausible. I just hesitate to attribute it to something mysterious (why would gluing down the stylus increase the electrical output?) when there's an obvious explanation.
3dB is audible in direct comparison, but I suspect not in an informal one where there is a significant time lapse between auditions. One of the banes of removable styli is that they do not always return to a perfectly repeatable position, so the level difference is very plausible. I just hesitate to attribute it to something mysterious (why would gluing down the stylus increase the electrical output?) when there's an obvious explanation.
SY,
You are on Statement 1.
The blow was given by the last 8 words.
After having read your post yesterday night, I went to bed. I was too tired to reply. In the morning that I woke up, what i could recall from my dreams was that, I was in one corner of a boxing ring, and you were sitting in the oposite corner, warming up for the fight. You were a mixture of Mark Tyson and "IsNoGood".
The refery did not let the fight to start until I woke up to go to work (one of the benefits of waking-up early).
Your "obvious" explanation is a plausable one for me, OK.
But the one that you call it mysterious may have a deterministic root. Let me lay down my hypothesis:
All the electrical energy that the motor of the cartridge provides to it's output pins, comes from the kinetic energy of the cantilever (better expressed: All the modulation of the moving magnet's magnetic energy, is provided by the kinetic energy supplied by the cantilever).
Where does cantilever draws this energy from? From the modulated grooves of the rotating disk.
This is the only energy source, the amount of which depends on the modulation velocity of the recording.
Now suppose that some parts of the cartridge are vibrating.
For vibration to occur, energy has to be supplied to originate vibration, as well as to sustain it.
The source of this energy according to my hypothesis is the kinetic energy provided by the cantilever.
Now the cantilever has to draw energy from the record "pool" in order to feed two power consumers.One the motor and the other the vibrating parts.
Since the energy provided by the record grooves is finite and defined, the result is that, the motor takes only part of the energy that it would, had there were no vibrating bodies.
This is the explanation that I believe makes for 80-90% of the recorded 2-3 db increase.
Regards
George
You are on Statement 1.
The blow was given by the last 8 words.
After having read your post yesterday night, I went to bed. I was too tired to reply. In the morning that I woke up, what i could recall from my dreams was that, I was in one corner of a boxing ring, and you were sitting in the oposite corner, warming up for the fight. You were a mixture of Mark Tyson and "IsNoGood".
The refery did not let the fight to start until I woke up to go to work (one of the benefits of waking-up early).
Your "obvious" explanation is a plausable one for me, OK.
But the one that you call it mysterious may have a deterministic root. Let me lay down my hypothesis:
All the electrical energy that the motor of the cartridge provides to it's output pins, comes from the kinetic energy of the cantilever (better expressed: All the modulation of the moving magnet's magnetic energy, is provided by the kinetic energy supplied by the cantilever).
Where does cantilever draws this energy from? From the modulated grooves of the rotating disk.
This is the only energy source, the amount of which depends on the modulation velocity of the recording.
Now suppose that some parts of the cartridge are vibrating.
For vibration to occur, energy has to be supplied to originate vibration, as well as to sustain it.
The source of this energy according to my hypothesis is the kinetic energy provided by the cantilever.
Now the cantilever has to draw energy from the record "pool" in order to feed two power consumers.One the motor and the other the vibrating parts.
Since the energy provided by the record grooves is finite and defined, the result is that, the motor takes only part of the energy that it would, had there were no vibrating bodies.
This is the explanation that I believe makes for 80-90% of the recorded 2-3 db increase.
Regards
George
Attachments
Hi George:
I have little time for NG activities so I must be brief.
you said: Now the cantilever has to draw energy from the record "pool" in order to feed two power consumers.One the motor and the other the vibrating parts.
My perspective is in the following question. When and where is the stray energy manifest in output? This focuses on the subject of distortion.
You have raised an interesting issue about tonearms in general. The term "tone" in tonearm is a very old one.
There has been much emphasis on the rigid tonearm in recent years, such as the ones with no headshell.
I know I'm not being very clear here. If this makes any sense.....should a tonearm be designed to change the resonant and/or misdirected energy into something harmless in terms of frequency? Or should is be damped as much as possible?
Mark
I have little time for NG activities so I must be brief.
you said: Now the cantilever has to draw energy from the record "pool" in order to feed two power consumers.One the motor and the other the vibrating parts.
My perspective is in the following question. When and where is the stray energy manifest in output? This focuses on the subject of distortion.
You have raised an interesting issue about tonearms in general. The term "tone" in tonearm is a very old one.
There has been much emphasis on the rigid tonearm in recent years, such as the ones with no headshell.
I know I'm not being very clear here. If this makes any sense.....should a tonearm be designed to change the resonant and/or misdirected energy into something harmless in terms of frequency? Or should is be damped as much as possible?
Mark
Results of...
Hi
I don't believe there are any 'misdirected' energy losses in mm carts with push-in styli. I would rather propose that due to the 'lossy' fitting of the stylus assembly in mm carts, the absolute true potential of the record grooves driving the cantilever is negated or not fully exploited due to flexing between the cart body and the cantilever holder. I guess that should there be any miniscule creaking or rattling between the latter two components, any audible result will travel to the headshell and further along the arm to the amp. Whether one would be able to measure such aberrations, is another question.
I further suspect that George's mods will result in a marginally higher output and an improved frequency response profile due to the integrity he introduced into the cartridge mass with the glue*
*) Regarding superglue or cyanowhatsisname: I use or have in my wife's fridge (where the cheese or butter should go), at least 5 or 6 different brands and kinds of the stuff. I use it to glue things together of course and have two unnamed favourites - one liquid and the other a gel. I also have in my workshop a branded superglue solvent, in gel form, as well as a large bottle of pure acetone. Sometimes, if mistakes are made in glueing, I prefer NOT to use either of the solvents I have as they make a mess. I still prefer to separate the items by heat (usualy my soldering iron set to 350C) and then scratch the remains off with an NT cutter blade.
So, what I'm getting at here - set superglue is not as hard as you may think. I have plenty of experience in scratching at blobs of the stuff with a cutter blade.
This glue will help with what George is trying to achieve but I guess that a hard-curing cement of one kind of another would give more favourable results.
I have here a substance (and I'm not quite sure if it is "Resin") but is a brown translucent stick and has a very low melting point. If you dig at this stuff with a cutter blade, it shatters into fragments like glass. Using such a substance for the purpose of what George has done, would have resulted in an even more rigid assembly.
If I have time, I'll make some experiments a la George (hope no infringement of his ideas), using a 'scope and some frequency response test records.
bulgin
Hi
I don't believe there are any 'misdirected' energy losses in mm carts with push-in styli. I would rather propose that due to the 'lossy' fitting of the stylus assembly in mm carts, the absolute true potential of the record grooves driving the cantilever is negated or not fully exploited due to flexing between the cart body and the cantilever holder. I guess that should there be any miniscule creaking or rattling between the latter two components, any audible result will travel to the headshell and further along the arm to the amp. Whether one would be able to measure such aberrations, is another question.
I further suspect that George's mods will result in a marginally higher output and an improved frequency response profile due to the integrity he introduced into the cartridge mass with the glue*
*) Regarding superglue or cyanowhatsisname: I use or have in my wife's fridge (where the cheese or butter should go), at least 5 or 6 different brands and kinds of the stuff. I use it to glue things together of course and have two unnamed favourites - one liquid and the other a gel. I also have in my workshop a branded superglue solvent, in gel form, as well as a large bottle of pure acetone. Sometimes, if mistakes are made in glueing, I prefer NOT to use either of the solvents I have as they make a mess. I still prefer to separate the items by heat (usualy my soldering iron set to 350C) and then scratch the remains off with an NT cutter blade.
So, what I'm getting at here - set superglue is not as hard as you may think. I have plenty of experience in scratching at blobs of the stuff with a cutter blade.
This glue will help with what George is trying to achieve but I guess that a hard-curing cement of one kind of another would give more favourable results.
I have here a substance (and I'm not quite sure if it is "Resin") but is a brown translucent stick and has a very low melting point. If you dig at this stuff with a cutter blade, it shatters into fragments like glass. Using such a substance for the purpose of what George has done, would have resulted in an even more rigid assembly.
If I have time, I'll make some experiments a la George (hope no infringement of his ideas), using a 'scope and some frequency response test records.
bulgin
experiments?--go for it, we'll read 'em
Hello Bulgin:, by misdirected energy I mean this:
Any energy that makes it into the tone arm is going to travel around in the tubular arm. Some of it will be returned to the cartridge. This energy will be of different phase and amplitude than it's origin. It creates distortion.
Distortion causes mistracking, which causes more distortion.
It is a viscous cycle that is perpetuated by the flexible medium, the vinyl.
The fact that there are so many types of vinyl and also types of cartridges makes tonearm design difficult.
The superglue is rigid enough to transmit sound. This is what I was referring to.
Hello George: I think what Bulgin was referring to was the sloppy fit that many stylii have in the cartridge body. This is the main reason I use the gasket silicon to hold them in. If I remember correctly, 3 db is a 50% increase. (I can't find my db chart) 2.7 is not far behind. I originally thought you said 2.7 percent. This would have been more believable. I do not say that you are mistaken in your experimental results. 2.7db is an unusually large increase indicating that you had a very sloppy fit without the glue. Mark
Hello Bulgin:, by misdirected energy I mean this:
Any energy that makes it into the tone arm is going to travel around in the tubular arm. Some of it will be returned to the cartridge. This energy will be of different phase and amplitude than it's origin. It creates distortion.
Distortion causes mistracking, which causes more distortion.
It is a viscous cycle that is perpetuated by the flexible medium, the vinyl.
The fact that there are so many types of vinyl and also types of cartridges makes tonearm design difficult.
The superglue is rigid enough to transmit sound. This is what I was referring to.
Hello George: I think what Bulgin was referring to was the sloppy fit that many stylii have in the cartridge body. This is the main reason I use the gasket silicon to hold them in. If I remember correctly, 3 db is a 50% increase. (I can't find my db chart) 2.7 is not far behind. I originally thought you said 2.7 percent. This would have been more believable. I do not say that you are mistaken in your experimental results. 2.7db is an unusually large increase indicating that you had a very sloppy fit without the glue. Mark
Hi all
I am in mod. mode today. I just stop for a while to have lunch (in front of the pc) and I saw a lot of posts.
Mark
3db (voltage, not power) is 37% increase. It is still a high number.
The measurement is correct, the explanation for this increase is under debate (either SY's explanation, or mine). Both explanations though, lead to high tolerances in the product (SY's at the magnet to coils interface, mine at all the external connections).
Bulgin
Again, if surfaces are well prepared and in intimate contact, cuanoacrylate is really strong.
You can weaken the Cyanoacrylate bond by putting components in a freezer for a few hours.
There isn't any bright idea here.
But even there was one, it would be beneficial to remain free for use. (Has anyone of the bright guys who privatised the outcome of the human genome project ever thought how the world would be if every idea from the past was already under copyright?)
In any case, feel all free to do what you wish. Just please report back.
I am going back to moding.
Regards
George
I am in mod. mode today. I just stop for a while to have lunch (in front of the pc) and I saw a lot of posts.
Mark
3db (voltage, not power) is 37% increase. It is still a high number.
The measurement is correct, the explanation for this increase is under debate (either SY's explanation, or mine). Both explanations though, lead to high tolerances in the product (SY's at the magnet to coils interface, mine at all the external connections).
Bulgin
Again, if surfaces are well prepared and in intimate contact, cuanoacrylate is really strong.
You can weaken the Cyanoacrylate bond by putting components in a freezer for a few hours.
There isn't any bright idea here.
But even there was one, it would be beneficial to remain free for use. (Has anyone of the bright guys who privatised the outcome of the human genome project ever thought how the world would be if every idea from the past was already under copyright?)
In any case, feel all free to do what you wish. Just please report back.
I am going back to moding.
Regards
George
already under copyright?
if every idea from the past was already under copyright?
Someone actually patented the Star Trek warp drive last year. They had no design or theory, but they got a patent. The news report showed the diagrams. It was prime time news. Not supposed to be a joke. Whoever actually learns to use gravity as propulsion may have to pay royalties on his own invention.
I figured out what happened George. You have a bottle of that new low-voltage formula superglue with viagra and didn't tell us. Mark
if every idea from the past was already under copyright?
Someone actually patented the Star Trek warp drive last year. They had no design or theory, but they got a patent. The news report showed the diagrams. It was prime time news. Not supposed to be a joke. Whoever actually learns to use gravity as propulsion may have to pay royalties on his own invention.
I figured out what happened George. You have a bottle of that new low-voltage formula superglue with viagra and didn't tell us. Mark
Mark and all
Although I am getting off-topic, I would like to write a few words about by stance on copyright implications.
In the beginning, money was a tool utilized to facilitate the exchange of essential products.
A farmer producing vegetables only, instead of exchanging his vegetables with the meat that a stock farmer was able to supply him, he was using money instead.
At that time, the value of money was undistinguishable from the value of hard work which the products or services represented.
Later on, this bond weakened and for centuries we are living in a world that considers money as something that can exist on it’s own. Finally we have given to money a status of moral value (having thrown the established social and moral values to the waste bin).
I was raised up in a low income environment. Now, I am in a better financial state, but I still consider money as then: A product of hard and useful work.
Easy money is something I try to teach my kids to stay away from (socially useless work as well).
Copywriting everything under a totally arrogant personal attitude just for the purpose of sacking hot money, should have been considered an unethical act (for the moral morons).
It doesn’t promote anything. It should be considered an act against true invention and productivity (for the rest of us morons).
Well Mark, I have to admit it. I have great results with this propriatary mixture. Vibrations increase up to 12 dB. For best results, I use a lighter slab (younger woman)
Regards
George
Although I am getting off-topic, I would like to write a few words about by stance on copyright implications.
In the beginning, money was a tool utilized to facilitate the exchange of essential products.
A farmer producing vegetables only, instead of exchanging his vegetables with the meat that a stock farmer was able to supply him, he was using money instead.
At that time, the value of money was undistinguishable from the value of hard work which the products or services represented.
Later on, this bond weakened and for centuries we are living in a world that considers money as something that can exist on it’s own. Finally we have given to money a status of moral value (having thrown the established social and moral values to the waste bin).
I was raised up in a low income environment. Now, I am in a better financial state, but I still consider money as then: A product of hard and useful work.
Easy money is something I try to teach my kids to stay away from (socially useless work as well).
Copywriting everything under a totally arrogant personal attitude just for the purpose of sacking hot money, should have been considered an unethical act (for the moral morons).
It doesn’t promote anything. It should be considered an act against true invention and productivity (for the rest of us morons).
Well Mark, I have to admit it. I have great results with this propriatary mixture. Vibrations increase up to 12 dB. For best results, I use a lighter slab (younger woman)
Regards
George
Dear all
I edited last paragraph of previous post.
It occured to me that some layer might see it googling "superglue" and I would have troubles afterwards.
Regards
George
I edited last paragraph of previous post.
It occured to me that some layer might see it googling "superglue" and I would have troubles afterwards.
Regards
George
We are not the morons. The morons are the spoiled children of the super rich who were raised to defend the family fortune. They don’t know what a days work is. All they know is their global power game. We are pawns on their little cheap plastic chessboard. Welcome to the world of globalization. The pain is only beginning. Globalization has been an ongoing process that began centuries ago. Modern technology is allowing it to gain undue advantage.
My cartridge is a dude
His stylus is nude
He is never rude
Good vibrations include.
Just clean off his needle
It does him so proud
Crank up the Beatles
And scream with the crowd.
Diamonds are forever
007 mil infact
Dynagroove in action
Flawless groove contact.
New virgin vinyl
Reproduction pristine
Happy transducer
His stylus is clean
I believe that political posts are taboo on this forum. Nothing personal, but this was a pretty wonderful thread until that little treasure slithered in.
John
politics and audio don't mix
Point well taken. I was supporting George's concern that the patent process is being abused.
True, political spins can go out of control.
Best Regards, Mark
Point well taken. I was supporting George's concern that the patent process is being abused.
True, political spins can go out of control.
Best Regards, Mark
To quote Aristoteles, "Human is a political animal"
Nevertheless, I fully accept the responsibility for the inappropriate spin-off.
Mea culpa.
hailteflon is innocent.
He is a poet after all. Poets should never be charged for intellectual “crimes”.
As a self-punishment I will refrain myself from posting for 4 days (96 hours).
Again, my apologies.
Regards
George
Nevertheless, I fully accept the responsibility for the inappropriate spin-off.
Mea culpa.
hailteflon is innocent.
He is a poet after all. Poets should never be charged for intellectual “crimes”.
As a self-punishment I will refrain myself from posting for 4 days (96 hours).
Again, my apologies.
Regards
George
George, Can't you just let yourself go with a warning?
You do realize that the punishment for thought crime can go as high as being superglued to your chair at work?
O' lamentable day
Freedom forlorn
I solve my problems
With alittle corn
If perchance
The light do see
Freedom reigns
I shout with glee
Happiness is yours
Do take
If light humor
You will make
So I say
With dutiful light
So humor make
I make my flight.
The poet has left the planet and is now in sailing through the universe with pen in hand. Oooh, didn't see that asteroid.
But he's a pinball wizard
They made him purdy tuff.
Play the Moody Blues
And Hare Krsna stuff.
I sure miss the 60s. Best Regards, Mark
You do realize that the punishment for thought crime can go as high as being superglued to your chair at work?
O' lamentable day
Freedom forlorn
I solve my problems
With alittle corn
If perchance
The light do see
Freedom reigns
I shout with glee
Happiness is yours
Do take
If light humor
You will make
So I say
With dutiful light
So humor make
I make my flight.
The poet has left the planet and is now in sailing through the universe with pen in hand. Oooh, didn't see that asteroid.
But he's a pinball wizard
They made him purdy tuff.
Play the Moody Blues
And Hare Krsna stuff.
I sure miss the 60s. Best Regards, Mark
cartridge shell alteration
George, After you have punished yourself and have a brand new attitude you may want to read this (no more poetry, I promise)
The following is from another forum found while trying to find information on an old Empire 200 cartridge.
http://www.audioheritage.org/vbulletin/printthread.php?t=3169&pp=1000
the grado black was really boring at the start but after a couple of days it seemed as if it had beaked in a bit. and opened up! but still pretty boring so i removed the steel shell that surrounds it so the pickup was "open" i could now see the coils. and WOOHOO! now it really opened up! totally diffrent pickup, smooth, airy sound instead of the "heldback" original sound! it was like playing it outside of a beercan instead of iniside! i did this on a ortofon VMS-20 also with the same results! higly recomended. not on 500 dollar pickups but on the cheap ones, could howerver work on the expensive pickups too.
-------------------------
It is a good read, this extract is from about the middle of the page.
The point here is that your increased output may have had to do with gluing the shell. This guy took it off and liked the difference. Not sure what order you glued things in. Mark
George, After you have punished yourself and have a brand new attitude you may want to read this (no more poetry, I promise)
The following is from another forum found while trying to find information on an old Empire 200 cartridge.
http://www.audioheritage.org/vbulletin/printthread.php?t=3169&pp=1000
the grado black was really boring at the start but after a couple of days it seemed as if it had beaked in a bit. and opened up! but still pretty boring so i removed the steel shell that surrounds it so the pickup was "open" i could now see the coils. and WOOHOO! now it really opened up! totally diffrent pickup, smooth, airy sound instead of the "heldback" original sound! it was like playing it outside of a beercan instead of iniside! i did this on a ortofon VMS-20 also with the same results! higly recomended. not on 500 dollar pickups but on the cheap ones, could howerver work on the expensive pickups too.
-------------------------
It is a good read, this extract is from about the middle of the page.
The point here is that your increased output may have had to do with gluing the shell. This guy took it off and liked the difference. Not sure what order you glued things in. Mark
At which chair? My workshop's? Oh, I would love it!!
Oh, no Mark, please. Don't do this to us. It is very rare (and extremely beneficial to all of us technofreaks here) to have the chance to enjoy some droplets of another kind of intelectuality.
Well, this probably doesn’t have to do with mechanical vibrations, but with the impact the steel shell (or was it mu-metal shell?)has over the electromagnetics of the cartridge.
I am not ready to deal with the innards of the cartridge, but a few words on the subject you brought up, won’t be a large side step.
Metal shielding of coils is done apparently for EMI reasons. That is, to “shield” the coil’s electromagnetic field from external fields, or to protect nearby components from coil’s electromagnetic field.
How does the shield function?
If the shield is made out of paramagnetic (mu~1) high electrically conductive copper or aluminum, it shields the electromagnetic field, but only at the high frequencies.
If the shield is made out of ferromagnetic (50<mu<30000) low electrically conductive materials, it shields the electromagnetic field even at the low frequencies.
This is the intended action of the shield.
The unintended action (as the intended one actually), has it’s roots in the eddy currents which are induced by the coil’s magnetic field (primary magnetic field) into the shield (Faraday’s Law).
These eddy currents in turn, produce a secondary magnetic field around them, which opposes the primary magnetic field (Lenz Law).
This way, primary and secondary magnetic fields work one against the other in a dynamic way.
The resultant composite magnetic field affects the electric current which is running through the coil.
If the current through the coil is of a steady-state form (sinusoid), an equilibrium finally is reached and the amplitude of the current is stabilized in some value. This is not the case for arbitrary waveforms though (distortion generation).
The parameters which affect the amplitude (and consequently the effects of) eddy currents are:
Coil current's amplitude and frequency.
Size, structure and shape of coil .
Proximity of coil to shield.
Conductivity of shield's material.
Permeability of shield's material.
Geometric shape of shield.
I hope the cartridge manufacturers take the eddy current effects into consideration.
Regards
George
- Status
- Not open for further replies.