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Conrad-Johnson It just sounds right

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  #51  
Old 07-02-2016, 11:11 PM
mfoley3 mfoley3 is offline
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Hi.
I've owned CJ preamps for many years (PV10A, Premier 10, Premier 16LS2 and currently a GAT). My experience is that while all, with the exception of the GAT, have had some discernible noise that the amount of noise was never particularly objectionable and that with each newer model the amount of inherent noise was reduced.

I've had ground loop hums with all, however. The most recent of which was solved by using a cheater plug on an Oppo 105D that was connected to the GAT for movie audio. The Oppo was plugged into a separate power circuit which was different than the two dedicated circuits into which my power conditioners were plugged. I've had one occurrence of very serious preamp-induced noise with the Premier 16LS2 and that was related to a bad tube. Once replaced the system returned to its previous low level of noise.

From my experience, I believe that the problem is related to a malfunction in your ET-5 rather than a design flaw. I would let your dealer chase down the problem. If they can't, then I'd find another CJ dealer rather than throw in the towel on the ET-5 or CJ.

Good luck,
Mike
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  #52  
Old 07-03-2016, 02:57 AM
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Briz Vegaas Briz Vegaas is offline
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For me its not a matter of throwing in the towel on CJ. After yet another upgrade to audirvana software on my systems ( regulated Paul Hynes linear powered) macbook the system is sounding great. Best ever. ( not sure how this keeps occurring with each upgrade to that particular music player, but it does).

I was listening to some Dave Brubeck earlier and it sounds brillliant.

The ET5 is just a case of audiophile nervosa. What if it can sound even better, etc etc. If anything the CT5 is sounding quieter right now, not that it is ever particularly noisy. Its also just struck me that the HT input is currently not hooked up, maybe that adds a tiny bit of noise, but only noticable when you remove it, if you know what i mean.
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  #53  
Old 07-03-2016, 01:25 PM
stereoquest stereoquest is offline
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Hi Briz Vegaas,

I take it you are running two LP70's ? Are they both plugged into the same circuit ? Have you tried plugging all the components into the same circuit ?
Ground loop is generally caused by an earth differential --- two components plugged into different circuits with different earth drop voltages --- the RCA connecting the components is the 'second ' earth and when there is a ground differential on power this will cause hum in the RCA 'second earth .

The cheater plug is a band aid that removes the second earth ' the RCA earth/ground'. The other way is to lift or float the ground on the power supply on the component -- this should be looked into carefully before attempting it .

The best way to start is With everything -- Amps, pre and source -'everything that has a physical connection via RCA ' plugged into the same socket and nothing else because this eliminates the differential ---that includes the laptop power supply --/ try to keep all power cables at least 100mm ( 4 inches ) away from interconnects . Power sockets also as far away as possible from interconnect .

Ground loop can be solved -- it may not be easy.

Good luck and keep up the persistence . Hope the above helps.

Derk
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  #54  
Old 07-08-2016, 04:30 AM
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Briz Vegaas Briz Vegaas is offline
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Two LP70s, no, why do you think that? Its a stereo amp and sounds fabulous with KT120s, Nordost titanium sort cones and an Odin power cord :-). Definitely can be fine tuned to up the anti.

Anyway, as a quick update, i took the ET5 back to the dealers. It took him 3 seconds of listening to say " thats not a ground loop". The ET5 had developed a fault just for little old me. Its currently being diagnosed. No word at this time.
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  #55  
Old 07-08-2016, 07:33 AM
stereoquest stereoquest is offline
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Great news the dealer has found the unit to be faulty --- not that it helps your time lost 😔

-- not knowing your system it's hard to see on the net whether LP70s or LP70s is one amp or two -- running two stereo amps laterally or vertically is not uncommon and can lead to ground loop if they are not plugged into the same circuit -- hence my suspicion , that's all .
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