GSSL HUM

[meekie0]

HI DOES ANYONE HAVE ANY FIXES FOR HUM,
ITS NOT TO BAD ,BUT YOU CAN HEAR IT AT LOUD VOLUME

 

[user 10827]

NO NEED TO SHOUT!!! :wink:

I had a probloem also, and implemented SSL techs "of the board" CRCRC..

worked wonders for me

use the search...

 

[keefaz]

Spidey Fixes the Hum :razz:

Sorry :wink: :thumb:
http://www.groupdiy.com/index.php?topic=27700
http://www.groupdiy.com/index.php?topic=28113

 

[SSLtech]

meekie0,

Is it 50Hz or 100Hz? -If it's 100Hz, then you'll need a Handy-dandy C/R/C/R/C board, and all of your troubles will be over. -If it's 50Hz, then you have a ground loop, either in your gear or in the piece of equipment which you're connecting it to.

I do believe that the C/R/C/R/C solution is something which will solve a number of people's GSSL hum problems though.

Keith

 

[matta]

This solved mine: http://www.groupdiy.com/index.php?topic=18855

Cheers

Matt

 

[desol]

Proper grounding solved mine..

 

[meekie0]

thanks. i will try your ideas and let you know how i get on.
but off to glastonbury for the week so party on.
let you know then.

anybody built a LA 2A, and can tell me how much it cost

cheers thomas

 

[meekie0]

HI

anybody got any info on a C/R/C/R/C board

 

[jdbakker]

[quote author="meekie0"]anybody got any info on a C/R/C/R/C board[/quote]
See the threads that were linked earlier. As far as I know there's no prefab C/R/C filter board available; you'll have to construct it yourself on perfboard/veroboard/whatever.

JDB.

 

[vertiges]

[quote author="matta"]This solved mine: http://www.groupdiy.com/index.php?topic=18855

Cheers

Matt[/quote]

I made the exact thing that clever man did wink and that solved my hum problem.

eD

 

[reg presley]

Hi Meekie0!

that's at least four Scottish members on here now :grin:

 

[meekie0]

jistaweedrapohusthen! reg.

 

[MartyMart]

[quote author="meekie0"]jistaweedrapohusthen! reg.[/quote]

"Translation"

"Just a small drop of ??? then" ..... 'hus' ??

OR : does that mean "Just a few of us then" !!!! ????

Marty, :green:

 

[meekie0]

it does indead sir

or

eyeyirrightmaman!

 

[squib]

I had this hum / buzz too. It is caused by poor ground design on the pcb. I cut two ground tracks, both near the edge of the pcb leading away from the large ground plane that the filter capacitors are soldered to. The rectifier noise dropped from -72dBu to below the noise floor at -90dBu.
There is also another issue which I haven't pursued as yet. When the threshold is set below the audio level ie compressor can occur then the distortion goes up significantly. This occurs even with the unit in bypass thus it is not the distortion that will occur with short release times. I suspect that once again it is a layout issue and the sidechain rectifier is injecting harmonics into the supply or ground for the audio path. It would be great to have a solution for this.