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11-15-2020 Post does not mapped to Knowledge Tree
anthony
Posts 268
Joined on 08-18-2014

Post #: 1741
Post ID: 26001
Reply to: 25997
Alligator clips
 Romy the Cat wrote:
Solder 10-15 inch 10Ga wire to you negative grounded terminal. Then begin to tough diligent points of you circuitry with other sides of your wire. You very fast will find how to bridge you ground in order to get rid of you noise. You might hold that wire in hands and just short different pars of grounds, but your hands might act as own antenna. You get the idea….


Yes, I did this just with alligator clips...very quick results...
11-16-2020 Post does not mapped to Knowledge Tree
N-set
Gdansk, Poland
Posts 485
Joined on 01-07-2006

Post #: 1742
Post ID: 26003
Reply to: 26001
Thank you
Thank you very much for all the help/advise. I'm still to investigate the problem. The working hypothesis is that my phono has some GND routing problem. Will examine it with the scope and shortening method to see if that's the case.

PP does damp its filter caps noise to GND, the info I got from PP (hope can publish):

"The charger and the input AC filter circuits both connect to incoming AC and both are connected to ground  through their filter caps and therefore feed filtered noise to ground - where in a perfect ground system it would disappear from our life forever as intended."
Indeed, the noise at the output of my phono looks like charging voltage of a cap input filter (5ms base = 100Hz fundamental freq):
Output 5ms PP Online shorted MM.bmp
It is NOT present at the input RCA's and varies in amplitude depending which phono input I select (shorted MM smallest, Decca cart biggest).
Will let you know the results.



Cheers,
Jarek
STACORE
11-16-2020 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,246
Joined on 10-12-2006

Post #: 1743
Post ID: 26004
Reply to: 26003
Shield Unused Phono Jacks
Metal caps over phono stage unused RCA jacks can help with stray EMF/RFI. Cardas and others sell them.

Not saying something is wrong with the PP, just saying it doesn't take much to get noise from a phono stage, including any change in ground potential.


Paul S
11-16-2020 Post does not mapped to Knowledge Tree
N-set
Gdansk, Poland
Posts 485
Joined on 01-07-2006

Post #: 1744
Post ID: 26005
Reply to: 26004
Have them
The GND noise enters somewhere past the input RCA's. And this GND noise is not the PP RFI/EMF.

RFI/EMF of PP looks like this:
Output 5ms 2mV GND lifted PP Online Decca.bmp

This one is caught by my Decca cart (phono GND lifted) but similar is present in the air, caught just by measuring cables. Time basis is still 5ms (vertical is 25x less than above). You can see the characteristic 'pumping' in regular periods (try to ignore the 50Hz hum).
That's probably the charger.



Cheers,
Jarek
STACORE
11-16-2020 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,246
Joined on 10-12-2006

Post #: 1745
Post ID: 26006
Reply to: 26005
Switched PS
Hmmm...

Whatever it is, if it's on the ground leg it "should" be possible to route it to ground before it gets in the amplifiers. Have you tried moving around a sheet of well grounded Mu metal, see if it catches and/or drops hum volume?


Paul S
11-24-2020 Post does not mapped to Knowledge Tree
N-set
Gdansk, Poland
Posts 485
Joined on 01-07-2006

Post #: 1746
Post ID: 26012
Reply to: 26006
Still fighting
My exorcisms to eliminate 100Hz PP induced noise in the EndOfLife phono gave no results so far.

- I took GND from the PP socket and tried connecting it to various GND points I could access (the signal GND plane, input sockets GND, the case). This only increased the noise.

- I tried connecting different GND points within the circuit. No results.

- The noise seems larger when the PP batteries are not 100% charged, suggesting it comes from the charger working (it disappears when the PP is in the battery mode)

- On the SUT inputs, the noise changes its amplitude with changing the orientation of the signal unit  with respect to the power supply but never vanishes completely.

The last makes me suspect it might be emitted by the phono power supply and travel by the air to the signal unit. Perhaps PP excites the supply big chokes?  But then why lifting the phono ground from the PurePower eliminates the noise completely?? Cannot understand it. Will get a scope tomorrow and try seeing where the noise enters.



Cheers,
Jarek
STACORE
Page 88 of 88 (1,746 items) Select Pages:  « First ... « 84 85 86 87 88
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  What lives in Symmetric Sound?..  The beginning of our journey is ALWAYS symmetrical...  Audio Discussions  Forum     19  132547  05-28-2004
  »  New  Always check power-line polarity...  Polarity checker, for convenience...  Audio For Dummies ™  Forum     7  78742  07-10-2005
  »  New  RAAL “Water Drop” tweeter for Macondo...  Your comment takes me by surprise...  Horn-Loaded Speakers Forum     77  764506  02-16-2007
  »  New  My feelings about new exciting audio products..  Vacuumstate...  Audio Discussions  Forum     25  213526  04-30-2007
  »  New  Musique Concrete horns..  These are now sold as Kornhent products...  Horn-Loaded Speakers Forum     6  85765  06-12-2007
  »  New  Compression drivers and the “clean signal”...  The NEW “Compression drivers and the clean signal”....  Horn-Loaded Speakers Forum     14  128127  07-12-2007
  »  New  Digi Redux; Drive 1 transport and iDAT-44+ DAC..  Ha! It might have lasted FOREVER!...  Didital Things  Forum     25  169688  09-28-2007
  »  New  Metal domes..  Try the one Lansche is using...  Audio Discussions  Forum     6  62426  11-08-2007
  »  New  The power AC Outlets?..  Where to Pick Up the Gong?...  Audio Discussions  Forum     2  34048  10-31-2008
  »  New  The Avicenna's failure is the great Avicenna success!..  New life for Avicenna...  Audio Discussions  Forum     8  63998  02-03-2009
  »  New  Internet and electricity..  Suboptimal. . ....  Didital Things  Forum     1  21273  01-07-2010
  »  New  Electricity... power strips and ac improvements..  Electricity... power strips and ac improvements...  Audio Discussions  Forum     0  12802  03-30-2010
  »  New  Another example of energy..  Still fighting...  Audio Discussions  Forum     1745  7317773  01-29-2011
  »  New  I good spot-light for a turntable?..  Reply...  Analog Playback Forum     15  118262  10-24-2010
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