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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hello RomyI had a friend pick up the Expressive from the seller for me. I am a little disapointed in the physical apperance as there are a few scratches and the seller thinks I a crazy for saying so.I haven't tried it yet as my friend still has...
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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, so far the interconnect shields were connected to the phono pre grounding bolt only--I do not want to pass any equalizing currents between the TT and the phono via the shields (the TT chassis, armtube, etc was connected to the same place via a ...
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The topic is absolutely idiotic but it is what it is. For the last week I was trying alternative power cords for my PP3000. Not that I was looking for some kind of different sound but I was trying a heavy shielded power cord with 30A power receptacle...
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Years ago i was testing various signal and speaker cables and wire configurations (as many did). Various gauges, shielded co-axials as well as single and multiple strands in various shapes/relations between signal and ground. My conclusion was that a...
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Hmmmm. Nset I will tell you something that will disturb you but it is what it is. If you did not use transformers and your phono was noisy and shielding did help it to be not noisy then you do not a proper grounding in your phonstage. The non- shield...
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Is the "ground plane" in this case literally a sheet of copper that you run all the grounds to? If so, this may be overkill on the one hand and an antenna/noise magnet/generator on the other hand, and/or it may well make for ground loops. It is u...
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...is a pita, no, no, PITA! In my circumstances I've had so farreasonable results using foamed natural rubber to mechanicalydamp the chassis. Has anyone tried that ridiculously expensivesilicone gel tape/chips?As for the multiple shields on MC's. Hig...
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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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This is probably a related question to LED bulbs with their electronic transformer crap inside.I have not noticed any noise with the full volume up on my Stax O2 so far andI was intentionally looking for it. There is only a gentle crack when I switch...
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I got a pair of good Pultec shielded coils that I am planning to stick in the Rohde & Schwarz’s multiples decoder to replace the Schwarz’s original RC based 75ms FM de-emphasis. I still am contemplation if to stick the filter in open loop where t...
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[quote user="miab"]Adrian, can you confirm whether you were using cable with shielding or without? Like you I had the buzzing go away when on battery or without PP2000 in system. It became dead silent. Then with PP2000 back in system there was buzzin...
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May I ass-u-me that any real alternative to the PP is also Class D, with "dashed" 'scope traces? In that case, regarding fan noise from alternatve regeneration devices, shouldn't any switching devices (including the PP) be kept away - or even shield...
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... then I feel it needs to be addressed not shielded cables but by searching the source of it. if it is the case then I'm pretty sure that somewhere in battery charging circuitry there is some kind of pulse transformer or any other magnetic dispersi...
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By the time I realized (last year) that I'd kissed off 2016 a year early, it was too late to edit/correct my mistake. Ironically, 2016 has been an "off year" for me, in terms of hi-fi, so, in fact, I've little to reprise for this year. I have poked ...
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Glad to hear you finally went and did IT! Now let's see (hear) how buffered per-channel level-set resistance works with the per-channel curves, and how easy this is to tune and integrate per total (stereo) side. It seems like this pretty much "has t...
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2010 was marked by the best music sessions I have had in my life. Changes to the K&K and iDAT DAC that I have chronicled were challenging to integrate but ultimately very worthwhile, and re-working the DEBZ crossovers has gotten me, I think, abo...
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We are very happy that in spite of your wishes for specific features, the new PurePower+ units are performing in your system the way we intended.You may find the appearance of the voltage sine wave a little less elegant, but is a small compromise f...
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[quote user="oxric"]Whilst as Romy points out, the room might well be on the small side, it has a very high ceiling (say 4.5 m) that in my mind always presents fabulous opportunities. [/quote] I have a second opinion about the size of the room. My in...
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Over 10 year later, I finally "finished" and installed a shielded version of the above cable for the short run between my phono SUT and my phono stage, replacing the nondescript Placette cables I've been using there all this time. As anyone experien...
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[quote user="manisandher"]Sorry Romy I can't help you - I've never heard of this before. But I'm certainly tempted to explore further now...(Incidentally, my new PP2000 will arrive tomorrow.)[/quote]You can Google the “Legally Slow Down Power Meter” ...
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N-set, starting from reasonable input, the 6E5P can swing some serious voltage, and Romy also sings its praises in terms of sound. Maybe sim that, running it in its safe zone to a 6C33C. From there, you have all the power you'd want to drive -- what...
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I was wondering what is coming out from PP2000 that makes one unit affect another. It might be radio and magnetic stray fields. Last night I took my gauss meter and was sniffing all around my PurePower regenerators. I was not able to see any signific...
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I set up one of my TU-X1 to work from own front end and from Schwarz via high quality relay. It very convenient – push a button and the front-end switched. Everything is well shielded, there are no noises and everything is very nice. What however sur...
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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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[quote user="Paul S"]No way to guess about grounding, at least until you show the final traces. I simply must use shielded inputs, and I bleed these "upstream" via a "dedicated" ground (and certainly NOT the "house ground"...). Yes, I realize this ...
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I think you did not understand what I mean. Also, there was a subtle word "implicite" in my statement which makes a difference here.Closed magnetic loops: I did not mean the cores of magnetics, but thegeometry of the shields. To catch the magnetic fl...
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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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[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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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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