Thump

[Jimbo]

I have had a large thump for many years that is heard through my speakers when I turn on/off my turntable motor. The turntable is very well earthed ie the tonearm is earthed and I have an earth wire connected to a ground on the back of my preamp.

All my RCA cables are shielded as are all my mains cables. However the earth cable is not shielded.

Do you think shielding the earth cable would help?

[struth]

check the spark suppressor capacitor across motor switch.. might need replacing

[Firebottle]

^ what he says,

Sheilding the earth cable will not change things IMO.

[hifi_dave]

As above.

Is the thump audible when you turn down the volume ?

[Jimbo]

As above.

Is the thump audible when you turn down the volume ?

No the thump is not audible at all when I turn down the volume. I think it is some electrical surge that is probably picked up by the tonearm cable which is highly exposed as you can see in the picture or by the preamp?

https://live.staticflickr.com/65535/52767033422_3a1c5b3a01_k.jpg (https://flic.kr/p/2ooQQEj)7961D2D5-4889-4701-A409-09450658FB0A (https://flic.kr/p/2ooQQEj) by y (https://www.flickr.com/photos/162281319@N03/), on Flickr

[mbic]

I take it that you cannot switch the loudspeakers out?

[Jimbo]

I take it that you cannot switch the loudspeakers out?

I have a mute switch the preamp which will cut out the thump when I turn off the turntable but its a bit of a paint keep doing.

[Jimbo]

I wonder if the preamp is picking up the noise of the motor switching on and off and causing the thump. Not sure if there is anything I can do about it?

[Wakefield Turntables]

Mine does the same and has done for years, all my kit still works and no explosions. I wouldn't worry about it.

[Macca]

Surprised no-one has asked if it's a normal thump or an ecky thump.


https://www.youtube.com/watch?v=o5UZgELC57g