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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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...in my case the problem seems to be a GND loop *inside* my End of Life phono. Thanks to the continous help of PP Richard, I started to suspect the terrible noise I'm getting actually may be the charging voltage of the PP el caps (indeed it is 100Hz...
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Jarek, when you say disconnecting the phono ground from the PP ground stops the noise, why is it you don't just do that? Are we confusing "ground" and "neutral again? If the phono stage works quietly when its ground is disconnected, why don't you jus...
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Ideally, you'd want to drive 35 feet of balanced interconnect with the low impedance source ( say below 150 ohms or so). How low depends upon interconnect capacitance. You can try Jensen output transformer to convert SE to Balanced at the phono-stage...
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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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All the research and theory; all those exotic, expensive little bits and pieces; too bad there's no way to tell if a cartridge will work until you try it. And then there's precious little you can do to fix it if it doesn't.In plotting an end-around,...
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I followed exactly Romy's advice. I disconnected EVERYTHING from PP1500 apart from the Endoflife phono. The phono output was monitored via RTA software on a battery powered laptop. There was only phono connected to the PP. [I don't have GND loop...
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[quote user="Paul Costa"]I have a PDF file of the manual if it interests you to read it, I can email it to you. The unit weighs 80lbs, uses 6 6sn7's. What I found a little odd was the spec for the phono is it says : MM Phono Stage Gain: 64 dB at 1 kH...
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Maybe someone read this http://twogoodears.blogspot.com/2009/05/we-437-based-phono-stage-solid-rock-did.html, worth reconsidering its design - also (partially) using WE 437A - after the last posts discussion at Roman's... also worth remembering that ...
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On any USA electrical wiring system, ALL circuits are referenced to and mechanically connected directly to a common ground at all times via the "neutral" wire, which ultimately connects to the grounded bus in the service box. And all UL electronics a...
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Again, there is no need, even for "safety", to have a separate ground wire if everything is star grounded. Since the neutral and the safety ground connect at the service bus, running the "safety ground" back to that bus for your phono stage apparentl...
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Correction: The CH brand phono stage I looked at is (of course) a current amplifier, and no reason to be curious about a regular old, typical voltage amplifier. I see there is also a VERY Expensive, 4-chassis version of this (already expensive) pho...
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Paul, with my semi-nomadic life I don't have much chance to work on what I want to work on...The grounding etc I have +/- understood. What now is beyond me is cart-phono interaction and calibration.How do you calibrate your phono? Cheers,n-set...
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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 potentia...
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Romy, I have noticed the same thing with the phono stage power supplies, that the big multi-chassis units with dual 100 lb. PS get no overall sonic advantage, all said and done. So how do we deal with the stupid, lousy AC that is too often...
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Rowuk, we do not disagree about the "battery/dynamics" equation. As you know, the "accepted notion" from the pundits is that "battery phono stages lack dynamics", and the one expensive unit I've heard did seem lethargic, albeit in a "salon". Howeve...
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Adrian, was your PP1500 noise present ONLY in the phono section or across the sources/components? My tuner and digital work like a wonder, only phono picks the noise. I read your earlier description and my noise is not high pitched but rather upper b...
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I heard the 'cole' LCR phono by the hifi supply recently at a friends house and it sounded ok, the Allnic 1500 that I am using at the moment is the best phono I have heard, and the price is extremely reasonable for the design, valve regula...
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I have no idea who Panagiotis Karavitis is. He isist that he is doctor and I hope he is better doctor then an audio reviewers, if not then I hope he cure only republicans…. Honestly I did not read the Karavitis’ review in while. I did first paragraph...
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***The proper loading value is difficult to say without knowing your system, as it is partly a preamp and ultrasonic RF issue as well as one that involves the cartridge and audible frequencies. Some cartridges have frequency abberations within ...
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[quote user="gurevise"]Ideally, you'd want to drive 35 feet of balanced interconnect with the low impedance source ( say below 150 ohms or so). How low depends upon interconnect capacitance. You can try Jensen output transformer to convert SE to Bala...
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Good advice, to be sure.I have chosen the most "neutral", "tape-like" MC I have found, but of course it remains a phono cartridge/transducer... Meanwhile, I just checked VTF on a hunch and was annoyed to find that at some point&n...
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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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I think I have had enough time with this phono stage now to make a few remarks about it. In keeping with the spirit of this website I am not recommending this component, just reporting on it.
I got my unit off AudioGon after keeping my eyes pe...
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This is always good advice, to get to know the character of the phono stage. Because my favorite cartridges are not low voltage (I use Decca London Jubilee and Reference) I have never had a need for the ET SU-1 step up unit. In fact, I had this in my...
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I am somewhat familiar with the dact: I used it in non controlled manner but familiar environment; it was assembled by someone else who also provided the necessary power supply; it was in two chassis about 15x15x~30 cm each (one for ps), so the equal...
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If a car engine does not stat then among zillion reasons why it does not start there are only two main reasons - there is nothing to burn or there is nothing to light up. The very same I think is about my Second Tonearm. Since all cartridges on this ...
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Adrian, I wonder how you wound up with the never-mentioned FET 10? FWIW, it was one of the better all around phono stages I've heard, and - not that it matters - I prefer it to the EAR 834 I heard. Is this another case wher...
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I have been adding and reconfiguring gear recently and I will be needing a 6' digital cable very soon, when I add batteriy power, so I just went ahead and bought one of the "Synopsis" remainders Romy mentioned.This $5 discontinued Belkin blue ca...
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Here's a decent attempt to boil down basic "ground" issues. Generally speaking, according to best practices, grounding one's hi-fi is a systematic attempt to equalize the ground potential throughout the system at "zero". Again, phono stages are harde...
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It is the second Romy, the noise is always present. There was always a little noise but when I had a soundsmith strain gauge system arrive, I was expecting not to have any noise. It is a hum free device. When I installed it thought, there was a buzz....
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