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Post by dougport on May 1, 2015 12:31:31 GMT -5
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Post by Priapulus on May 1, 2015 12:37:30 GMT -5
> Also, it got really bad when I touched the Tonearm.
I had a hum. Connecting a ground wire between the preamp ground screw and the turntable chassis helped. Extending the ground wire to also connect to the metal part of the tonearm eliminated the hum entirely. Loose, bad or reversed cartridge wires can also cause a hum.
/b
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KeithL
Administrator
Posts: 10,002
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Post by KeithL on May 1, 2015 16:42:17 GMT -5
A phono cartridge is basically both a mechanical transducer and a magnetic sensor. A noise that only occurs when the arm is down could be a mechanical vibration being transmitted through the record itself (which could be from the motor, vibrating the platter). It could also be an electro-magnetic signal being picked up by the cartridge. The motor, along with everything else in the room, and even the wires outside, all radiate magnetic noise into the air. Changing the relationship between the cartridge and those noise sources will change how much it picks up (for example, if there is a wire running under the turntable, the arm will be closer to it when it's down than when it's up). Along with wiring you need to experiment with turntable position and orientation (try turning the turntable 90 degrees; try it on a different table; especially try moving the wires between the turntable and the preamp around a bit; any of those might affect hum pickup). And try moving it further away from devices that use a lot of power - like big amplifiers. Likewise, tiny signals like those put out by cartridges can easily be contaminated by tiny amounts of noise in the power lines, or radiated into the air. Therefore, try turning off all lights and appliances, and especially lights with dimmers and CF bulbs - which include tiny switching power supplies. Ditto for cordless phones, WiFi routers, and cell phones. Ditto for TVs and monitors. Unlike digital equipment, turntables are very sensitive to even the tiniest amounts of mechanical vibration and electro-magnetic noise. Sure, it could be motor hum too, but why would that sound more when he drops the needle?
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Post by qdtjni on May 1, 2015 17:10:19 GMT -5
Just to clarify, I interpreted motor hum as an electrical interference and not motor vibrations.
Being familiar with that particular model Project, the motor and it's cables are on the left side and back side, so lowering the arm would make it close to those cables, but just by 1 mm or so, roughly 20.1 cm instead of 20 cm. I would have thought that could be neglected.
What puzzles me is that the noise started to occur after removing an ethernet switch and a media center (i.e. computer). Could it be a problem with floating ground, which was not there with the switch hooked up to a LAN even though Ethernet is supposed to be galvanic insulated?
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Post by brubacca on May 1, 2015 18:48:41 GMT -5
I obviously have some experimenting to do. Not sure why it started happening. I honestly believe that the Switch and ethernet cab;e/media server are ancillary concerns. Removing them should in no way cause this. IN fact they were on the shelf below the TT so if anything removing them should have improved things.
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Post by vneal on May 1, 2015 18:50:27 GMT -5
Just as I suspected you have a phono pre amp with a cheapo plug transformer. Where exactly is this plugged in? If it is into a reciever . or preamp that is the cause of your hum. Personally I would loose the phono pre
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Post by brubacca on May 1, 2015 20:02:39 GMT -5
Just as I suspected you have a phono pre amp with a cheapo plug transformer. Where exactly is this plugged in? If it is into a reciever . or preamp that is the cause of your hum. Personally I would loose the phono pre I was using a Lounge Audio LCR. I have had it 6 months with no problem. Today I removed it from the chain and plugged the TT directly into the phono section of my Rogue Audio Cronus Integrated Amp. So as of now on that system the only wall warts are the TT wall wart and the wall wart for my iPod Dock, a Pure i-20 dock. Again i have been using these components for months without problem. I hear what you are saying about cheap power supplies. I'll start by removing everything from the system except the Integrated Amp and TT. I'll build from there add add components one by one. Probably will not happen quickly, but i'll try to find time this weekend to make the changes. Regards, Charlie
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Post by brubacca on May 2, 2015 15:22:16 GMT -5
I unplugged everything from outlets in the room.
Then plugged in my CMX-2 -- (1) - Naim , Qute, (2) Outlet expander-- phono AC Adapter, TT DC Adapter...
Still loud humm. It has to be the TT. Very frustrating. I'm not sure it's worth the grief for my 25 albums. 23 of which i also have digitally. This may be the end of the TT experiment.
Everything worked previously.
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Post by ttocs on May 2, 2015 15:55:42 GMT -5
I had a ground loop hum suddenly appear one day, no audio or video equipment had changed. After a week of frustration, I discovered that it was the cable company's incoming coax. Just to be clear, no hum since I've lived here, then one day - hum. The only thing that fixed it was when I ran it through my Panamax which filtered out the hum.
All of the grounds in a house are connected at the main electric panel to the same bus.
I post this for extra info only because it seems that the OP's issue may lie in the TT.
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Post by brubacca on May 9, 2015 8:05:10 GMT -5
Just to follow back on this thread. I replaced the interconnects between turntable and phono pre. The factory ones were a bit loose. The new ones and nice and snug. The sound mostly went away. If you really crank the volume it is still there, but nowhere near as bad as it was.
I spoke with a local dealer and he said to remove the motor mount screws. He has had several customers with a very low level hum on this table. It is still there, but barely noticeable.
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Post by qdtjni on May 9, 2015 8:11:56 GMT -5
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Post by Priapulus on May 10, 2015 8:32:26 GMT -5
> Also, it got really bad when I touched the Tonearm. I had a hum. Connecting a ground wire between the preamp ground screw and the turntable chassis helped. Extending the ground wire to also connect to the metal part of the tonearm eliminated the hum entirely. Loose, bad or reversed cartridge wires can also cause a hum. /b > "got really bad when I touched the Tonearm"
"Extending the ground wire to the metal part of the tonearm"
/b
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Post by brubacca on Nov 3, 2015 21:09:12 GMT -5
Problem fixed. I got rid of the Pro-Ject. My new table has no problem.
As a dealer told me, the Carbon is built to a price point and the components reflect it.
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novisnick
EmoPhile
CEO Secret Monoblock Society
Posts: 27,235
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Post by novisnick on Nov 3, 2015 21:15:15 GMT -5
Problem fixed. I got rid of the Pro-Ject. My new table has no problem. As a dealer told me, the Carbon is built to a price point and the components reflect it. Yep. Sometimes ya gets whats ya pays for. The good part is, you've decided you like vinyl and have taken the next step. What did you get? What cartridge? Edit; found it,,,,,time to change your sig. may I sugest an LP thats been repressed almost every year since it was recorded? this is one of my absalute favorites, last time i played it , I could smell the cigarettes burning! Incredible!!
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Post by brubacca on Nov 3, 2015 21:32:35 GMT -5
That Dave Brubeck album is on my list. My last name is actually Brubach... I should own that album. I got the table at Soundstage Direct and they treated me very well. I went over there after speaking with the Owner.
I ended up ordering 3 new albums tonight. Eric Clapton Crossroads 2013, Billy Joel Piano Man and Van Morrison Moondance.
I'm listening to Keb Mo as I type this.
This traveler is my second heaviest component after my tube amp.
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novisnick
EmoPhile
CEO Secret Monoblock Society
Posts: 27,235
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Post by novisnick on Nov 3, 2015 21:41:55 GMT -5
That Dave Brubeck album is on my list. My last name is actually Brubach... I should own that album. I got the table at Soundstage Direct and they treated me very well. I went over there after speaking with the Owner. I ended up ordering 3 new albums tonight. Eric Clapton Crossroads 2013, Billy Joel Piano Man and Van Morrison Moondance. I'm listening to Keb Mo as I type this. This traveler is my second heaviest component after my tube amp. Shame the Mets didn't have you!!! There all home runs!!!
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Post by brubacca on Nov 3, 2015 21:47:54 GMT -5
Nick,
I really wanted that RP6, but I couldn't get comfortable with the cost. The Traveler was the cost of the RP3. I am the bargain hunter. The table sounds really great. The fluidity of Vinyl is what is striking to me after months without.
Now I need to explain to the Mrs where the fire engine red TT came from.
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Post by sidvicious on Nov 4, 2015 8:41:34 GMT -5
You did well with the Traveler, it's a good table. Vinyl is great once you get the right table. I went through several to get to my VPI HW-19 MK 4 and I love it as I'm sure you will love your table. Now go out and buy plenty of vinyl and find some good used stores. This is how you build your collection for next to nothing, in your area and enjoy!!!
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Post by vneal on Nov 4, 2015 9:01:06 GMT -5
I would take an VPI Travelor over any Rega table. VPI tables hold their value. Kind of the McIntosh of turn tables on the used market
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