Senior Member
Location: Birmingham
Posts: 6,811
I'm James.
Thump
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?
Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702
Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2
Super Moderator
Location: W Lothian
Posts: 99,005
I'm Grant.
check the spark suppressor capacitor across motor switch.. might need replacing
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Senior Member
Location: The Black Country
Posts: 6,089
I'm Alan.
^ what he says,
Sheilding the earth cable will not change things IMO.
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Trade: Radlett Audio
Location: Near Saffron Walden, Essex
Posts: 7,090
I'm Dave.
As above.
Is the thump audible when you turn down the volume ?
Senior Member
Location: Birmingham
Posts: 6,811
I'm James.
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?Originally Posted by hifi_dave
7961D2D5-4889-4701-A409-09450658FB0A by y, on Flickr
Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702
Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2
Senior Member
Location: Birmingham
Posts: 142
I'm Michael.
I take it that you cannot switch the loudspeakers out?
Senior Member
Location: Birmingham
Posts: 6,811
I'm James.
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.
Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702
Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2
Senior Member
Location: Birmingham
Posts: 6,811
I'm James.
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?
Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702
Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2
Trade: Wakefield Turntables
Location: Yorkshire
Posts: 9,325
I'm Andrew.
Mine does the same and has done for years, all my kit still works and no explosions. I wouldn't worry about it.
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Drunken Moderator
Location: Staffordshire, England
Posts: 37,927
I'm Martin.
Surprised no-one has asked if it's a normal thump or an ecky thump.
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