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It is currently 18 Mar 2019, 09:33

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 Post subject: Turntable hum
PostPosted: 13 Mar 2019, 17:49 
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Joined: 19 Oct 2018, 15:30
Posts: 73
Location: Montréal, Québec
Hi everyone !

I’ve been reading about turntable hum in hope of finding a way to reduce my thorens td-165 hum. The hum only happens when the needle touches the vinyl. When the motor turns with the needle up, it’s completely silent. I’ve separated the cassis ground from the signal and added a ground wire according to the owners manual. When I cleaned the grounds of this wire, the hum reduced, but there is still too much for me. Also, the hum is only present with the turntable. CD and other sources are fine. Could you point me out on what could cause a hum that’s only audible when the needle is down ?

Thanks to all !


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 Post subject: Re: Turntable hum
PostPosted: 13 Mar 2019, 20:13 
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Joined: 23 Feb 2017, 02:02
Posts: 361
Don't have any exprience with turntables but could be just that poor quality design.
Some humm and noise pickup when the needle is down is might be normal.

Second could possibly be power supply, I think this is vintage turntable, maybe capacitors dry up.
Or maybe orignal design has capacitors for power supply too small.


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 Post subject: Re: Turntable hum
PostPosted: 14 Mar 2019, 12:22 
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Joined: 19 Oct 2018, 15:30
Posts: 73
Location: Montréal, Québec
There is no real power supply in this turntable. It as a synchronous motor that uses the mains frequency (60hz) to keep its speed. There originally was a cap between the hot and the neutral wires, supposedly to prevent pops when you turn the motor on and off. Maybe I could try to replace it with a new safety cap (Y2 rated wich fails open to prevent both ac wires to get shorted)


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 Post subject: Re: Turntable hum
PostPosted: 14 Mar 2019, 18:46 
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Joined: 23 Feb 2017, 02:02
Posts: 361
Yes I think that may help.
Could it also possibliy be a warned out turntable needle that needs replacing or is dirty that causing the noise?


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