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I have a used 3.1 preamp. recently it started to make a scratching noise when the volume knob is turned. this happens every morning after the car sits all night long.

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Bring a contact cleaner spray with oil and apply it in volume knob try with the pipe to reach volume inner and move volume forward and backward-you can obtain the contact cleaner from (radio shack)near your home.

Posted on Nov 27, 2009

Testimonial: "great suggestion. i'll give a try."

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Posted on Jan 02, 2017

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1 Answer

I have a Kenwood KC 105 preamp and the volume is stuck on high. I turn the volume knob but it does nothing. Any suggestions?


Looks like you are going to have to replace the potentiometer, AKA volume control. It must be shorted out inside (probably) or knob came off the shaft. (doubtful)

Feb 02, 2015 | Kenwood Sc-75 Av Surround Processor...

1 Answer

Crackling noise with my volume knob when i turn the volume


It's probably dust in the volume control. It gets in between the carbon track and the wiper that rotates on the track, or the resistive / carbon track inside the control is wearing out. As yours is stereo there will be 2 tracks and 2 wipers, one could be worn more than the other.
This should give you an idea. Inside Pot

May 05, 2012 | Audio Players & Recorders

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Whichever direction I turn the volume control knob (clock or anticlock wise), the volume always increases. I cannot turn the volume down


There's a endless volume knob who has contacts to inform if the volume increase or decrease.
It's normally produce noise and the circuit understand it like a data.
You can put a 1uF/50V capacitor in the each of 2 soldering points of the volume control to the ground (there has 3 points. One is ground and the others are live).
Best regards

Jul 24, 2011 | Cambridge Audio Azur 740A 2Channel...

1 Answer

When you switch the amplifier on there is a strong background noise that is not linear with the volume, as it decrease a bit after the first quarter of the volume knob run. I have tried it in diferent...


If the noise does not go away when you turn the volume control down the problem is in the output stage. If the noise is in one channel, then you should only look at that channel. Use the other good channel as a guide to what is working. If in both channels then it can only be something common to both channels. The bad news is that anything can cause noise.

Nov 07, 2010 | Cambridge Audio Azur 540A Amplifier

1 Answer

Volume knob broken


needle nose pliers to turn it down,find another knob there pretty common even if you had to use a drop of super glue.

Aug 29, 2009 | Sony TA-N9000ES 5-Channel Amplifier

1 Answer

Noise when changing the volume


You can try cleaning it first.Unplug and disconnect the unit. get some electronics contact cleaner with lube. Spray the interior of the potentiometer liberally while rotating the knob back and forth. don't be afraid of using too much cleaner.
Good Luck

Dec 27, 2008 | Audio Players & Recorders

2 Answers

Annoying sound


i forgot to mention,when i take the belt away from the mechanism that turns the deck,the scratch noise stops..

Jan 15, 2008 | Panasonic Technics SL-BD22D Turntable

1 Answer

Volume starts out at full


If you read the owners manual careful it tells you something about setting the volume at start up buy setting the volume to desired level then push in and hold a few seonds the volume knob and that volume should be reached every time you start your vehicle.

Oct 12, 2007 | Dual XDVD8181 Car Video Player

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