Out of curiousity; does anybody have a 100% hum-free vinyl set-up? And if so, what are your set-up; cartridge, tonearm, turntable. And is it stock, or did you do anything to achieve hum-freedom(!?). Any exotic grounding- schemes? And when I say hum-free I mean hum-free - nothing whatsever with your ear to the speakers.
If you have hum then you have a grounding issue. Check that the ground wire is actually connected to the ground it is supposed to be connected to and that the ground wire is actually soldered to where it is supposed to be on the arm itself. The solder connection could have broken.
Also are you using a grado cartridge? If so, those are notorious for picking up hum from a turntable motor.
My setup is this...
Revolver turntable/Jelco arm/Ortofon VMS20E mk2 cartridge -> diy 6dj8 passive tube phono preamp -> 6sn7 preamp -> 6v6pp amp.
The turntable is grounded (via the ground wire) to my phono preamp. I have no hum what so ever.
Also are you using a grado cartridge? If so, those are notorious for picking up hum from a turntable motor.
My setup is this...
Revolver turntable/Jelco arm/Ortofon VMS20E mk2 cartridge -> diy 6dj8 passive tube phono preamp -> 6sn7 preamp -> 6v6pp amp.
The turntable is grounded (via the ground wire) to my phono preamp. I have no hum what so ever.
Hi,
No hum whatsover with an MC into Audiolab 8000A.
Proper 5 wire grounding, though I did convert the
Rega arm from 4 wire to 5 wire many years ago.
rgds, sreten.
No hum whatsover with an MC into Audiolab 8000A.
Proper 5 wire grounding, though I did convert the
Rega arm from 4 wire to 5 wire many years ago.
rgds, sreten.
I currently have three players. Lenco L75 (modded) w. Mission 774C and Ortofon 2M red. Rega P3 w. Rega rb300 and Goldring 1012gx and Systemdek Transcription w. Rega rb300 and Audio Technica 30e. The Rega P3 is the quietest but none are 100% quiet. The Lenco/Mission has a separate groundwire, the other two are grounded internally. The phono in use is Jasmine 2.5. Of course the grounding is working in that if I disconnect the earth the hum gets a lot worse. It is not the turntables, I still have the noice if the turntables are not plugged in. Could I have a problem with the incoming power?
So you have hum even when the interconnects coming from the TT are disconnected? Or what do you mean by "not plugged in"?
Could the source of noise be the phono preamp itself? Got enough PSU filtering there?
In my experience hum free vinyl is possible, but it requires good grounding, good screening, careful routing of interconnects and, of course, silent amps.
Could the source of noise be the phono preamp itself? Got enough PSU filtering there?
In my experience hum free vinyl is possible, but it requires good grounding, good screening, careful routing of interconnects and, of course, silent amps.
By not plugged in I mean turntable power plug disconnected, i.e. only tonearm to riaa connocted. Phono has a separate power supply, and I had the same noice with my other phono pramps - a naim and a brik. The rest of my system is dead quiet - got two tube-amps (ac heated) and they are totally silent. In my quest for black background I do ask myself questions I don´t have the knowledge to answer. For instance - in regaarms the black earth is connected to the blue lead. But many mm carts have a tab grunding the cart to the green lead. Does that not pose a problem? I mean the cart is surely connected to the tonearm via mountingsrews and whatnot?
Okay, so the amplifier chain without any plugged interconnects from the turntable is silent?
Do you have hum if the power plug of the TT is unplugged and only one single interconnect (for example only the left channel) from the TT is connected to the phono pre?
Do you have hum if the power plug of the TT is unplugged and only one single interconnect (for example only the left channel) from the TT is connected to the phono pre?
So, I think that my problem might be that my AC, wall socket, that is, doesn´t have a ground connected. (just found out) Meaning that my system has a floating ground, which seems to be OK for amps, tuners and cd players but not for turntables. Now I don´t know enough about this stuff yet, but I´m thinking of maybe grounding to a radiator, or the balcony? I live in an apartment so my hands are somewhat tied. Ideas, suggestions?
Hum is very difficult to diagnose if you don't have knowledge of the internal grounding schemes of your electronics. You could have everything just right but still have hum induced by the internal grounding, as I did. But in my case it was a diy preamp, so I had some control, and I found that I had grounded the phono input to a noisy spot shared by the heater supply. I had it go to the phono section directly and the hum disappeared.
There is a very good paper here on the website in the articles section on grounding that you should read, which is where I learned enough to see my problem.
http://www.diyaudio.com/forums/diya...udio-component-grounding-interconnection.html
There is a very good paper here on the website in the articles section on grounding that you should read, which is where I learned enough to see my problem.
http://www.diyaudio.com/forums/diya...udio-component-grounding-interconnection.html
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"maybe grounding to a radiator, or the balcony? " - hope you've got your life insurance paid up..... & public liability... get a good electrician to install an earthed AC outlet
+1
Humphrey Acetate was a 1920's celluloid star....
Perhaps Humphrey Vinyl seeks to emulate him or works for a flooring manufacturer...🙂
Section 3.3 in the paper I mentioned. Galvanic isolation and Common mode rejection are the main benefits.
Will check in to balanced inputs. However, on a basic trial and error attempt ( still don´t know what I´m doing I got the Rega quiet (haven´t tried the other ones yet) The Rega has a two prong plug (the other ones three). I plugged a powerstrip/rack without a ground into the strip were all the other stuff is connected, then plugged the Rega into the unearthed strip. Bingo - dead quiet.
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