Why is my tt generating static?

[Primalsea]

P.S. I wouldn't use a rubber mat of any variety - nothing to do with static, I just think they sound cr*p.

Theres rubber mats and then theres rubber mats. I heard a few crap turntables once didn't mean that I thought they were all crap.

The problems with matts is that felt is thought to sound one of the best. It causes too much static though which is a real pain. Apparently felt mats absorb all audio frequencies more or less equally, making them quite netural.

Other matts tend not to do this so you just have to keep trying until you get something you like that doesn't cause static. Sometimes a mix of 2 or more mats can work.

I've been hunting for a pure carbon fibre matt as they are conductive, no static but haven't found one yet.

Earthing the spindle is a very good idea.

[YNWaN]

I take your point, but actually I have tried a lot of mats and made a lot of mats. I haven't tried all rubber mats by any means, but I have tried a number of soft ones and hard ones - I preferred the hard ones (particularly dislike the Silicone one).

The felt mat is a pretty good compromise in terms of sound (I agree that it may well exacerbate static) but is not my own choice.

I use a minimal contact mat in which small nibs of metal make contact with both the record label and the metal platter; the main bearing on my deck is also run to earth - I never experience issues with static.

[pentode10]

Thanks.

That was my initial thought (and fear of a sudden flying experience!)

How would I check that it is earthing properly?

Firstly you need to be satisfied that you have suficient electrical knowlege to do any work or tests safely.If in any doubt take your deck along to a proper sevice engineer for testing.

First switch off at the mains and remove the plug.
Then just open the plug and check all is well and the wiring is sound.

Try and obtain a continuity tester or a small electronics meter from most DIY stores.

Set the meter to low ohms range and connect one probe to the earth centre pin of the mains plug and the other probe to the metalwork on your deck including the spindle.

The meter should deflect right over to the right around 0 ohms or if using a circuit tester the lamp should illuminate.
If it doesn't the earth is open circuit and your deck should be sent for service.

If you feel happy you could open up the deck and check for lose wiring and make good any bad connections and then retest.

All this must be done with the mains dissconnected...

The only proviso to all of this is if your deck has a two core mains lead and as such should be double insulated. ( ie no earth connection )

It may be as well to check you mains delivery outlets ie power block 4 way etc in the same way. ( Dissconnected from the mains )

The only less likely possibility is your house wiring.
If you've had fuse blowing or light bulb failier for no apparent reason on a regular basis, have your wiring checked out ( especially the earth )

Hope this helps

Andy.

[symon]

Andy - thanks. That is very helpful.

My electrical knowledge is minimal. But, what you have laid out here gives me confidence to at least do the checks, even if I can't fix any problems!

[Primalsea]

I use a minimal contact mat in which small nibs of metal make contact with both the record label and the metal platter; the main bearing on my deck is also run to earth - I never experience issues with static.

To be fair most rubber mats are made as cheaply as possible. You can tell this because they smell or their surface is not uniform in colour, or both. The mat I use is of good quality but its probably the very small contact it has with the record thats the important part.

I've just had an idea

An industrial gasket supplier should be able to supply a 10" and 4" soft graphite ring gasket. These could be glued to a cork matt

[YNWaN]

Hmm...well, the graphite ring gasket idea is an interesting one - I will look into it. I have tried cork as a radial ring mat, and rubber, and acylic. I quite like cork as a mat material but still signifacntly less than the system I use now.

[chris@panteg]

I've been hunting for a pure carbon fibre matt as they are conductive, no static but haven't found one yet.

i have one ' had it for years never really used it until now, been experimenting with my SL1210 with rubber mat then carbon fibre mat on top ' interesting results so far.

[greenhomeelectronics]

Rather than a bowl of water go to your garden centre and find some pot plants that like to be well watered. Buy two or three of them as a present to your missus, make sure the pots match the colour of the room your hifi is in, make sure she reads the label withthe watering instructions. It might be a good idea to start an argument with her first otherwise she might get suspicious that you have started bringing flowers home. Not only will you have a chuffed missus, you will have sorted your static problem and will have someone to replenish the water supply while you enjoy the music.
That will be job done, that will.
Dave.

[break-3]

You can get proper humidifiers to put moisture into the air. At their simplest, they cost a few pounds and hang over your radiator - those are the ones I use.

[Tony G]

It is also possible to use the Milty ZeroStat pistol - not having air conditioning or central heating, static is rarely a problem for me but I have one of these and use it when a record raises the hairs on my arm - it does the job.
I am not personally in favour of antistatic products applied to the record surface no matter how effective they are - we don't like extra gunk in our grooves we don't.
A light brushing with a carbon fibre brush while the record turns prior to play can also help but often not.
Best to treat the static on the record before play to reduce attraction of airborne dust - this is where the Milty is good.
All the humidity related info is good, just wanted to add an option.