kuruvilajacob
Well-Known Member
I feel the RCA cables provided by Project may be of poor quality. Change the cables and you will not have the hum sound.
How to reduce hum with phono preamp
- Thread starter mahiruha
- Start date
I didn't read all of the posts but many are talking around shielding your cables.
An area that is perhaps not covered by the previous posters is grounding the body / components of your turntable to the electrical ground. I had to do this with my turntable after being befuddled with wire shielding solutions that didn't get rid of the hum.
Try attaching a grounding wire from the motor and/or turntable metal part of the chassis and/or base of the arm to the electrical ground. I found, through experimentation, that just touching these various components had a audible effect on the hum. Once I attached a grounding wire my hum was eliminated.
You can try the same after turning up the volume so the hum is at a good level and try this. Hope this helps in your circumstance. It did for me.
Ground loops, etc are quite mysterious....
Last edited:
kuruvilajacob
Well-Known Member
I didn't read all of the posts but many are talking around shielding your cables.
An area that is perhaps not covered by the previous posters is grounding the body / components of your turntable to the electrical ground. I had to do this with my turntable after being befuddled with wire shielding solutions that didn't get rid of the hum.
Try attaching a grounding wire from the motor and/or turntable metal part of the chassis and/or base of the arm to the electrical ground. I found, through experimentation, that just touching these various components had a audible effect on the hum. Once I attached a grounding wire my hum was eliminated.
You can try the same after turning up the volume so the hum is at a good level and try this. Hope this helps in your circumstance. It did for me.
Ground loops, etc are quite mysterious....
Grounding is one area many do not give much importance. But it is one of the most important things in getting the best in vinyl reproduction of magnetic cartridge. I make it a point to shield any exposed wire even inside the Turntable even though it may have overall shielding due to the position of the wire. It is easy to squeeze out water from the towel but the squeezing out the last few drops are the most neglected. Similar with Turntable shielding
reignofchaos
Well-Known Member
Why are you folks digging graves? Afaik mahiruha upgraded to a VPI TT and doesn't even use a project turntable anymore.
kuruvilajacob
Well-Known Member
That's okay. As long as the experience on this issue can benefit many others facing similar problem. That's why such forums are so useful provided members give accurate personal experience on any relevant issue
M
mpw
Guest
for a new TT owner - it can be quite a ride to eliminate the hum. The topic is still quite relevant and helpful just like the multitude of questions but no answers on cables and dacs.
regards
Hello,
it is indeed a problem to eliminate hum in a system specially when a turntable is introduced with a phono pre amp.From my experience with different TTs and phono stages I can say that there are two aspects of this problem. Many of us experience hum in a system the moment we introduce a TT and a phono stage . Two things can be happening here. One is the system to start with had ground loop issues so when a Phono stage is introduced along with a TT that ground loop problem gets magnified and as a result we hear hum. Eliminating ground loop problem is not easy and we have to isolate the equipment causing problem and make sure it is grounded properly to the electrical ground. A good product to solve ground loop issue is Ground Zero ground loop elimination system by Granite Audio. Listen to your music, not your hum. I haven't used it but the approach is very good and sounds reasonable. What I do in my system is I have connected a big extension box to the servo stabilizer output and all my plugs are connected to it. The idea is all the components must see same residual ground Voltage. It has eliminated hum significantly.
The second source of problem is most of the entry level TT uses long unshielded interconnects to connect the TT with a phono stage which in turn picks up lot of RF and EMI signals and introduces hum in the system.To eliminate this problem we need to use very good shielded cable of short length that is permissible. Nice discussion here Is it better to have short interconnects and long speaker cables or visa-versa? : Empirical Audio
Thanks.
it is indeed a problem to eliminate hum in a system specially when a turntable is introduced with a phono pre amp.From my experience with different TTs and phono stages I can say that there are two aspects of this problem. Many of us experience hum in a system the moment we introduce a TT and a phono stage . Two things can be happening here. One is the system to start with had ground loop issues so when a Phono stage is introduced along with a TT that ground loop problem gets magnified and as a result we hear hum. Eliminating ground loop problem is not easy and we have to isolate the equipment causing problem and make sure it is grounded properly to the electrical ground. A good product to solve ground loop issue is Ground Zero ground loop elimination system by Granite Audio. Listen to your music, not your hum. I haven't used it but the approach is very good and sounds reasonable. What I do in my system is I have connected a big extension box to the servo stabilizer output and all my plugs are connected to it. The idea is all the components must see same residual ground Voltage. It has eliminated hum significantly.
The second source of problem is most of the entry level TT uses long unshielded interconnects to connect the TT with a phono stage which in turn picks up lot of RF and EMI signals and introduces hum in the system.To eliminate this problem we need to use very good shielded cable of short length that is permissible. Nice discussion here Is it better to have short interconnects and long speaker cables or visa-versa? : Empirical Audio
Thanks.
pappu
New Member
Dear Mahiruha,
You are saying that your turntable having 3 pin plug that means it has an extra earth connection. When you are plugging in your TT from mains three connections are coming one LIve220 volt one neutral and 3rd one is earth. If it is like this then search for the point where the earthing wire is connected inside the turntable. I doubt that the point where earthing wire is connected is not shielded to ground that also may cause humm.
If it is like this then inside the TT you have to connect that earthing with ground .
You are saying that your turntable having 3 pin plug that means it has an extra earth connection. When you are plugging in your TT from mains three connections are coming one LIve220 volt one neutral and 3rd one is earth. If it is like this then search for the point where the earthing wire is connected inside the turntable. I doubt that the point where earthing wire is connected is not shielded to ground that also may cause humm.
If it is like this then inside the TT you have to connect that earthing with ground .
varunbadola1974
Member
Friends,
I face the problem of hum with my ENBEE ZX1 and ZX80 combination. It did not exist before. Even with the TT not connected, I hear a hum when the preamp is turned to phonological and the volume is raised. I have put a thin tin sheet on top of the phono circuits and the hum has reduced but not eliminated. With the volume set on 12 o clock the hum sets in. TT does not have any issue. Something more that I can do?
thanks
Varun
I face the problem of hum with my ENBEE ZX1 and ZX80 combination. It did not exist before. Even with the TT not connected, I hear a hum when the preamp is turned to phonological and the volume is raised. I have put a thin tin sheet on top of the phono circuits and the hum has reduced but not eliminated. With the volume set on 12 o clock the hum sets in. TT does not have any issue. Something more that I can do?
thanks
Varun
varunbadola1974
Member
The system is at present kept on a chest with a non working t.v. behind it. The plugs and the sockets are behind the t.v. the cables used are well shielded. So that aspect is taken care of. What is more annoying is the fact that the phono stage of my other amplifier, a PULZ 180, at best produces a hiss with the volume cranked up. So did the ENBEE, till this problem cropped up recently.
varunbadola1974
Member
Oh yes OM sir the mains are in the same room, but at least 10 to 12 feet away. We are talking of the mains of the house right? No transformers. Infact I got the problem examined by a gentleman who has been taking care of my other vintage stuff. He was the one who came up with the idea of putting a thin metal sheet on top of the phono circuit. The power supply caps to the phono circuit also seem to be in good shape.
If other phono stages working then no problem from surrounding environment. Something to do with particular phono stage itself.
How you say earlier it was not there initially? Was this same setup within same place was hum free?
How you say earlier it was not there initially? Was this same setup within same place was hum free?
varunbadola1974
Member
Yes it was Om sir. Unless, this being an old system, the components are giving in.
varunbadola1974
Member
I have even cut down on the gain of the system, which I thought was too high as 9 o clock should not have produced the volume it did. But I still feel that the hum can be reduced further.
varunbadola1974
Member
I'll surely look in there. Thanks
Do check how you route the phono cable from turntable to phono preamp. Keep it as far away from other equipment even if the phono cables are shielded. In my experience shielded phono cables pick up interference when passed close to other equipment.
vmscbe1974
Active Member
Hi
I have a different issue to solve. I get a feed back to the speakers when i tap the turntable or the wooden table on which i have placed my turntable. What could be the reason? my set up is Cosmic cogram 4000 /techncis SLQD 35, cambridge audio, Hk 6550, Speakers Sansui s-517.
Regards
Srinivas
I have a different issue to solve. I get a feed back to the speakers when i tap the turntable or the wooden table on which i have placed my turntable. What could be the reason? my set up is Cosmic cogram 4000 /techncis SLQD 35, cambridge audio, Hk 6550, Speakers Sansui s-517.
Regards
Srinivas
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