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PostPosted: 28 Apr 2018, 17:04 
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Joined: 23 Feb 2017, 02:02
Posts: 545
The case can be grounded, but the amplifier return ground should not be connected via case.
The case should have its own independent ground directly to mains, and the amplifier return another independent wire to ground.
Thats how it worked best for me in my experience

Quote:
The best way I have found to handle internal circuit grounds is to connect them to the AC mains one (which would include the chassis) via either a resistor and parallel X2 capacitor or a bridge rectifier.


Apparently In New Zealand which I am currently in, the law requires the ground and all exposed metal to have a resistance of very low less than 1ohm.
This means series resistor or didodes are not allowed.


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PostPosted: 28 Apr 2018, 20:09 
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Joined: 04 Jun 2008, 20:59
Posts: 4023
Location: Arizona, USA
Hi, That is correct. Same here, the case needs to go to the AC mains (earth) ground and everything inside like signal has its own internal ground that may connect to the case via the resistor/capacitor or bridge. I believe we are saying the same thing...just us northerners don't get what all you down under say all the time. I've always wanted to visit NZ, but it is a rather goodly distance from here. :)

Good listening
Bruce

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PostPosted: 30 Apr 2018, 11:10 
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Joined: 07 Mar 2017, 03:14
Posts: 103
I implemented a star ground on the left RCA input jack ground of my preamp in the weekend. To be more precise, I connected all the ground cables (totally 6, including other input and output jack grounds) on one RCA input jack ground (central ground). Then I connected that central ground to chassis ground/mains ground (they are the same jack for my preamp) via capacitor and resistor just as Bruce recommended.

I also replaced signal cables with Amtrans gold plated OFC wire. It was DHLabs BL-I, a shielded cable, before.

Since I did both at the same time I don't know which one is more effective. Cable replacement or star ground? But, the change was beyond imagination. For the star ground part, I'm not sure if I can implement it for each and every case. But, I delightfully added the Amtrans cable to my personal favourites list.


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PostPosted: 07 May 2018, 06:09 
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Joined: 23 Feb 2017, 02:02
Posts: 545
ozapaydin wrote:
I implemented a star ground on the left RCA input jack ground of my preamp in the weekend. To be more precise, I connected all the ground cables (totally 6, including other input and output jack grounds) on one RCA input jack ground (central ground). Then I connected that central ground to chassis ground/mains ground (they are the same jack for my preamp) via capacitor and resistor just as Bruce recommended.

I also replaced signal cables with Amtrans gold plated OFC wire. It was DHLabs BL-I, a shielded cable, before.

Since I did both at the same time I don't know which one is more effective. Cable replacement or star ground? But, the change was beyond imagination. For the star ground part, I'm not sure if I can implement it for each and every case. But, I delightfully added the Amtrans cable to my personal favourites list.

nice upgrade :up:


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