Grounding check for SE 300B amp

HornTube · 07:07 PM

I want to optimize my SE 300B monoblocks and rebuild them completely. Even that I never managed to build one with hum or noise, I want the ultimate grounding scheme for this one. Anybody with suggestions? Thanks

BTW, all ground wires will be 1mm OF Silver with cotton sleeves.

http://www.flickr.com/photos/horntub...in/dateposted/

Gluca · 28th January 2011, 07:23 PM

I never had hum problems with star grounding like yours but consider that you can pick up 50/60Hz noise from wiring or transformer coupling and that has nothing to do with grounding. Also check if there is any ground loop at the input.

tomchr · 07:31 PM

Star grounding is your friend. Keep loop areas small - i.e. signal "hot" and signal "return/ground" need to be closely coupled. Think twisted pair.

I suggest verifying the grounding scheme with regular copper wire before moving to any kind of boutique wire. What matters for signal integrity is the resistance and coupling capacitances, leakage/coupling inductances.

~Tom

28th January 2011, 06:59 PM	#1
HornTube diyAudio Member Join Date: Nov 2009	Grounding check for SE 300B amp I want to optimize my SE 300B monoblocks and rebuild them completely. Even that I never managed to build one with hum or noise, I want the ultimate grounding scheme for this one. Anybody with suggestions? Thanks BTW, all ground wires will be 1mm OF Silver with cotton sleeves. http://www.flickr.com/photos/horntub...in/dateposted/ Last edited by HornTube; 28th January 2011 at 07:07 PM.

28th January 2011, 07:28 PM	#3
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	Star grounding is your friend. Keep loop areas small - i.e. signal "hot" and signal "return/ground" need to be closely coupled. Think twisted pair. I suggest verifying the grounding scheme with regular copper wire before moving to any kind of boutique wire. What matters for signal integrity is the resistance and coupling capacitances, leakage/coupling inductances. ~Tom Last edited by tomchr; 28th January 2011 at 07:31 PM.

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28th January 2011, 07:23 PM	#2
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	I never had hum problems with star grounding like yours but consider that you can pick up 50/60Hz noise from wiring or transformer coupling and that has nothing to do with grounding. Also check if there is any ground loop at the input.

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