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Old School: Wiring Amphenol MC3M to Male XLR
Hi there. Here's a question for the "veterans" in this newgroup. I have an
old Shure 55s microphone (the Elvis type). This microphone uses an old school version of a modern XLR connector known as an Amphenol MC3M. This is a three pin arrangement (pin 1, pin 2, pin 3). Now, I have a brand new old-stock Amphenol MC3M connector, a brand new modern male XLR connector, and a length of mic cable. I want to put it all together and make a functional mic cable. Do I simply go pin 1 XLR to pin 1 Amphenol, pin 2 to pin 2, and pin 3 to pin 3? I have tried to locate this information through Google, but I cannot find anything that shows a proper diagram. As a sidenote, this 55s mic has a three way impedence switch (L-M-H), and I am not sure if that factors into the way the cable would be soldered up. Please advise. Thank you very much in advance. Regards, Darren |
#2
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Newsguy wrote:
Hi there. Here's a question for the "veterans" in this newgroup. I have an old Shure 55s microphone (the Elvis type). This microphone uses an old school version of a modern XLR connector known as an Amphenol MC3M. This is a three pin arrangement (pin 1, pin 2, pin 3). Now, I have a brand new old-stock Amphenol MC3M connector, a brand new modern male XLR connector, and a length of mic cable. I want to put it all together and make a functional mic cable. Do I simply go pin 1 XLR to pin 1 Amphenol, pin 2 to pin 2, and pin 3 to pin 3? No. I forget the pinout offhand, but get an ohmmeter. You will find one pin goes to the case. That one goes to pin 1 on the XLR. The other two have no connection to the case but have fairly low resistance between them. Those go to pins 2 and 3. I have tried to locate this information through Google, but I cannot find anything that shows a proper diagram. As a sidenote, this 55s mic has a three way impedence switch (L-M-H), and I am not sure if that factors into the way the cable would be soldered up. Actually, if you go to the Shure web site, and look at the discontinued products page, you will be able to download the original data sheet for the mike, with the schematic and everything. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#3
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Scott Dorsey wrote: Newsguy wrote: Hi there. Here's a question for the "veterans" in this newgroup. I have an old Shure 55s microphone (the Elvis type). This microphone uses an old school version of a modern XLR connector known as an Amphenol MC3M. This is a three pin arrangement (pin 1, pin 2, pin 3). Now, I have a brand new old-stock Amphenol MC3M connector, a brand new modern male XLR connector, and a length of mic cable. I want to put it all together and make a functional mic cable. Do I simply go pin 1 XLR to pin 1 Amphenol, pin 2 to pin 2, and pin 3 to pin 3? No. I forget the pinout offhand, but get an ohmmeter. You will find one pin goes to the case. That one goes to pin 1 on the XLR. The other two have no connection to the case but have fairly low resistance between them. Those go to pins 2 and 3. I have tried to locate this information through Google, but I cannot find anything that shows a proper diagram. As a sidenote, this 55s mic has a three way impedence switch (L-M-H), and I am not sure if that factors into the way the cable would be soldered up. Actually, if you go to the Shure web site, and look at the discontinued products page, you will be able to download the original data sheet for the mike, with the schematic and everything. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." http://www.shure.com/pdf/discontinued/55s_1951.pdf http://www.shure.com/pdf/discontinued/55s.pdf |
#4
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"Scott Dorsey" wrote in message ... Newsguy wrote: Hi there. Here's a question for the "veterans" in this newgroup. I have an old Shure 55s microphone (the Elvis type). This microphone uses an old school version of a modern XLR connector known as an Amphenol MC3M. This is a three pin arrangement (pin 1, pin 2, pin 3). Now, I have a brand new old-stock Amphenol MC3M connector, a brand new modern male XLR connector, and a length of mic cable. I want to put it all together and make a functional mic cable. Do I simply go pin 1 XLR to pin 1 Amphenol, pin 2 to pin 2, and pin 3 to pin 3? No. I forget the pinout offhand, but get an ohmmeter. You will find one pin goes to the case. That one goes to pin 1 on the XLR. The other two have no connection to the case but have fairly low resistance between them. Those go to pins 2 and 3. I have tried to locate this information through Google, but I cannot find anything that shows a proper diagram. As a sidenote, this 55s mic has a three way impedence switch (L-M-H), and I am not sure if that factors into the way the cable would be soldered up. Actually, if you go to the Shure web site, and look at the discontinued products page, you will be able to download the original data sheet for the mike, with the schematic and everything. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Hi Scott. Thank you very much much for your quick and informative reply. I am on track now. However, here's one that is a little confusing: I found an old cable in the bottom of a drawer that has the above-mentioned amphenol on on end and a 1/4 phone jacl on the other. So, I cut off the 1/4 jack and was going to put on a modern XLR. After I cut the cable, I noticed that this cable only contains one inner wire and the "shield". In other words, we have only two conductors here to connect to the modern XLR. Now, perhaps the shield goes to pin 1 of the xlr, but then we have only one conductor left over. Does the one that's left go to XLR pin 2 or XLR pin 3? By the way, I checked the Shure web site and found the document you were referring to, thank you. But with my extremely limited electronics knowledge, it really makes no sense to me. Darren |
#5
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Newsguy wrote:
Hi Scott. Thank you very much much for your quick and informative reply. I am on track now. However, here's one that is a little confusing: I found an old cable in the bottom of a drawer that has the above-mentioned amphenol on on end and a 1/4 phone jacl on the other. So, I cut off the 1/4 jack and was going to put on a modern XLR. After I cut the cable, I noticed that this cable only contains one inner wire and the "shield". In other words, we have only two conductors here to connect to the modern XLR. Now, perhaps the shield goes to pin 1 of the xlr, but then we have only one conductor left over. Does the one that's left go to XLR pin 2 or XLR pin 3? Right, that cable is for an unbalanced high-Z line. Throw the cable away and use a 2-conductor mike cable. That cable is not useful. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#6
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#7
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Mike Rivers wrote:
You really shouldn't use that cable with an XLR connector, but if you insist, connect the center conductor to pin 2 and connect the shield to pins 1 and 3. Be sure to turn the switch on the mic to M or L. Then plug it in, and when you hear how bad it sounds, you'll have second thoughts about whether it's worth the time and trouble to make the proper cable. He'll still want it on H because that's only about 150 ohms anyway. M and L are something like 50 and 25 and those positions really DO sound terrible. If you add some HF eq, the mic sounds a little better. |
#8
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#9
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S O'Neill wrote: Mike Rivers wrote: You really shouldn't use that cable with an XLR connector, but if you insist, connect the center conductor to pin 2 and connect the shield to pins 1 and 3. Be sure to turn the switch on the mic to M or L. Then plug it in, and when you hear how bad it sounds, you'll have second thoughts about whether it's worth the time and trouble to make the proper cable. He'll still want it on H because that's only about 150 ohms anyway. M and L are something like 50 and 25 and those positions really DO sound terrible. If you add some HF eq, the mic sounds a little better. The Shure published documentation refers to the "rated" impedence as: L = 38 ohms M = 150 ohms H = 40,000 ohms rd |
#10
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Mike Rivers wrote:
In article writes: He'll still want it on H because that's only about 150 ohms anyway. M and L are something like 50 and 25 and those positions really DO sound terrible. If you add some HF eq, the mic sounds a little better. There were several models of the Shure 55. I'm pretty sure at least one of them had a real step-up tap on the transformer so it could be run into a high impedance lower gain mic input that was typical of "the day." And as OT confirms later, once again I am full of it. I wonder where I got that...? Maybe it'll sound better now. |
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