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3-wire power cord for Marantz 2270

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Posted on August 2, 2016 at 18:50:51
sherod
Audiophile

Posts: 4842
Location: Texas
Joined: August 3, 2003
 I recently gave my Marantz 2270 a rebuild with all new caps on the boards. It sounds amazing. Now, for the icing on the cake, I'd like to put a better power cord on it. I have a standard 3-wire cord ready for it, but I'm not sure if I can connect a ground wire to it without getting a ground loop hum. I have read that ideally you should connect the ground to the chassis, but to connect it also to the ground wire from the transformer. Can someone help me with this? Also where to connect the hot(black) and neutral(white). The guys on the Marantz forum said to leave it as-is with original cord as the receiver was designed to have a floating ground. Thanks for your consideration.

 

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RE: 3-wire power cord for Marantz 2270, posted on August 3, 2016 at 07:16:36
FenderLover
 If it's working fine, I'd leave it as is.

 

RE: 3-wire power cord for Marantz 2270, posted on August 3, 2016 at 12:14:30
cloudwalker
Audiophile

Posts: 634
Location: central wa
Joined: September 27, 2012
 do you realize that the white (neutral) wire and the ground wire are connected to the same bar in the panel box? If a device is wired at the factory to work without a ground (usually double insulated), I would not change it..

 

RE: 3-wire power cord for Marantz 2270, posted on August 3, 2016 at 13:05:18
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
 Safety ground is a noise antenna. You dont need to connect it.


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: 3-wire power cord for Marantz 2270, posted on August 4, 2016 at 07:20:38
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Hey I like that description.

thanks

 

RE: If your concern is safety, posted on August 4, 2016 at 12:29:34
Russ57
Audiophile

Posts: 3754
Location: South Florida
Joined: November 16, 2001
 Then changing the electrical outlet to a ground fault type is the best possible thing to do. A ground fault outlet does not need a ground to work as intended. They offer a greater level of safety than any other solution.

 

RE: 3-wire power cord for Marantz 2270, posted on August 4, 2016 at 13:41:55
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
 I stole it from Charles Hansen I must admit.



ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: If your concern is safety, posted on August 4, 2016 at 18:43:13
cloudwalker
Audiophile

Posts: 634
Location: central wa
Joined: September 27, 2012
 You are partially correct. Do you know how a ground fault circuit interrupter works (a GFCI)? There is an even safer one now..it is called an arc fault circuit interrupter. Either will work..

 

RE: If your concern is safety, posted on August 4, 2016 at 19:06:56
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 How could some one know so much about GFR and so little about speakers.

You need to read those links we were sending you!!!!

Don't worry it's still a mystery to most of us. Also ignore the math it only confuses things.

charles

 

RE: If your concern is safety, posted on August 4, 2016 at 22:24:17
cloudwalker
Audiophile

Posts: 634
Location: central wa
Joined: September 27, 2012
 thank you guys for teaching me. I have all those sites saved and have read them all. We all had to start somewhere. I like music, but I also like to live. My mottos are "don't die before you live", and "we do these things not to escape life, but to keep life from escaping us" and "life is not measured by the number of breaths we take, but by the number of things that take our breath away"

 

RE: 3-wire power cord for Marantz 2270, posted on August 5, 2016 at 03:24:54
FenderLover
 Not only your unit is UL passed with two cord outlet, but changing the wiring COULD lower the resale value (believe it or not).

 

RE: If your concern is safety, posted on August 5, 2016 at 07:58:14
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Now I just like to not deny myself small pleasures. Like an ice cream or listening to my stereo at night and an nice hike on a desert trail.

Some one once told me "The greatest moments in your life just past you by while you never even knew they were happening".

I can't tell you how true that is


 

RE: If your concern is safety, posted on August 13, 2016 at 03:54:13
JURB
Audiophile

Posts: 2056
Location: North Ohio
Joined: May 29, 2016
 If you do not want hum and want a three prong AC cord the design of the whole unit is different. Ground currents through the chassis themselves are a subject of study, like, NO, don't put a circuit board pad there for the screw. It is a different design, not quite from the "ground" up so to speak, but close.

The engineer has to reconsider everything that has to do with grounds in the unit. Older units did not have as bad a problem with this so it was not addressed. Now it is but it has made things practically unserviceable. Going this way solved some problems but created a few others. In fact, back then when things only had two prong cords they were less likely to get blown up by a lightning hit. I know it was a different world but that fact holds true.

In my opinion, audio equipment should not use the grounded cord unless the ground is isolated by a suppressor or whatever network, like a 0.001 uF cap in parallel with a 2.2 meg resistor, and if you want safety two Zeners back to back, perhaps 40 volt units. And none of this shit gets you better sound, it is more likely to get you a hum and you will just cut it all out. If it was safe in 1975 it is safe now. When you talk 1935 that is different. But this is not that.

Unless the insulation is breaking down or the blades fall out of the plug, my advice is to leave it alone.

 

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