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Old 28th November 2008, 01:01 AM   #1
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Default Mechanic hum

Hi

How can there be some scilent mechanical hum from my recordplayer when it´s not on. It´s a Thoréns TD-150 mk1.
I have done all kind of restoring, but not the electrical part.
There is just only one capacitor and one resistor and no transformer.
Please give me some advise.
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Old 28th November 2008, 02:10 AM   #2
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Default Re: Mechanic hum

Quote:
Originally posted by Ragnwald
Hi

How can there be some scilent mechanical hum from my recordplayer when it´s not on. It´s a Thoréns TD-150 mk1.
I have done all kind of restoring, but not the electrical part.
There is just only one capacitor and one resistor and no transformer.
Please give me some advise.
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Can you draw a wiring circuit?
That 5,6K resistor is it paralleled to yellow cap? and both
are connected to the mechanical switch?
Try to change "polarity!!!" of the power cord in the wall socket!
This might help

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Old 28th November 2008, 09:40 AM   #3
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What i can see, it looks like this.
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Old 28th November 2008, 04:01 PM   #4
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Can you try this?
Warning:
This is under mains voltage 230Volts.
Before you try anything, pull out the power cord from the wall socket.
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Old 28th November 2008, 04:30 PM   #5
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zoranaudio

He he... your proposal, is like pull the connecting plug out of the wall.
But... i got your point, it´s a leaking 10nF cap?
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Old 28th November 2008, 04:37 PM   #6
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Yeeeeees!
Your motor is under voltage even when turntable turn off.
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Old 28th November 2008, 04:52 PM   #7
cbdb is offline cbdb  Canada
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does it hum when unpluged? An easy check to see if your cartridge is picking up EMI from somewhere else.
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Old 28th November 2008, 04:55 PM   #8
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Quote:
Originally posted by cbdb
does it hum when unpluged? An easy check to see if your cartridge is picking up EMI from somewhere else.
The Man have mechanical hum!!! not hum in the"speakers"

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Old 28th November 2008, 04:59 PM   #9
cbdb is offline cbdb  Canada
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sorry, misunderstood. does it vibrate when playing?
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Old 28th November 2008, 05:12 PM   #10
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Quote:
Originally posted by cbdb
sorry, misunderstood. does it vibrate when playing?

As the man said, it is vibrating when built in automatic switch turned off
I also hate any humming in my very silent room when the music stops.
BTW I never turn off my 2KW equipment when full loaded, the lights is light shows!
I think that easiest way to stop this is to remove 10 nf cap, or to put lower value like 2n2 cap. and try.
Without cap will cost some sparking in the switch contacts, and might some short pops in the speakers!!!
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