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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Almost all such hum finds its way into your audio signal path through a ground loop, although it is technically possible for AC 50/60 cycle hum to enter from adjacent unshielded power cables. Make sure the AC cable to the phono is well shielded and i...
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[quote user="son"]Its very clear right know,so i decide to build with 12,6v in series….[/quote] Son, when I proposed the series configuration I thought that you have already have an amp and would like to convert it to single plate configuration. Howe...
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[quote user="Romy the Cat"] Well, I have to admit that I did not listen the whole sound of AC vs. DC filaments yet. I will bring home today my DC lab supply that I use for my electromagnet coil and will give the try. I still at this point am not...
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Why not try to build on/off the best one has gotten to date? Without some kind of a pivot, there is only drifting; plus, it's got to be nice to have a fall-back position. I'd be perfectly happy to just BUY the damned cable, believe me, if...
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Power from the company grid is usually pretty decent in most respects, or at least it used to be. In the last 25 years or so the average home has seen an increasing number of devices which have switching power supplies (computers, monitors, etc...
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[quote user="RF at Ona"]Romy and friends,Reading about the sensitivity of your system to electrical power supply problems reminds me of the days when I used to make my own equipment as much for the learning experience as for the final result.One of t...
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[quote user="Romy the Cat"] Well, you need to get rid of transformers and to make your phonocorrector to have no noise of any kind with any transformers. From MM level you need to have no more then 1-3mV AC at output and absolute not noise. After you...
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Paul, after a month of vacations I've tried you advice:[quote user="Paul S"]If you can do it, try isolating both cases/chasses from your "ground plane(s)". Use one inclusive "ground plane" for both the PS and the gain/RIAA sections, and ground this "...
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SOS, as a starting point, it does not seem at all odd to me that adding an "other" piece of equipment to the electrical chain might require a reconfiguration of the system ground scheme. Of course, the phono stage is the worst case for hum, PP o...
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As a weekend-only listener, it can take me eons to break in some of my most stubborn components. In the case of the K&K, things seem to have reached +/- tonic equalibrium.I may have have mentioned it in passing, but at some point ...
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Romy, do you power your End of Life phono from the PP??
I have the same phono, with choke input PS for both the heating and the HV.
1) If I plug the phono just to the wall, the noise just normal wi...
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[quote user="RF at Ona"]Reading about the sensitivity of your system to electrical power supply problems reminds me of the days when I used to make my own equipment as much for the learning experience as for the final result.One of the mundane things...
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Thank you for the feedback guys!
- Bill and drdna below is the actual physical situation. The distance to the Decca is 110cm, to Phono 140cm (the noise is present even if I switch to a shorted MM input and the PP is on batteries...
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[quote
user="steverino"] Later after the PP battery was replaced hum disappeared
forever.
[/quote]
Interesting. What made you
to replace the battery? The reasons I ask is a because an old buttery would not
be different for powers supply then ...
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