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Amplifier Crackle


 
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yottie

from United Kingdom

Joined: 03 Jun 2007
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Location: Cumbria,
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PostPosted: Sat Jan 21, 2012 12:47 pm Reply with quote

I have a Sony Legato Linear amplifier (OK it's very old like me !) which has developed a crackle now and again. This seems to originate from the volume slider. Was wondering if there is a fix for this, I think I recall a spray to tackle it from the outside, if not is it possible to dismantle the case etc.
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Sam Gangee

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PostPosted: Sat Jan 21, 2012 2:43 pm Reply with quote

For decades I've sprayed WD-40 inside and it works fine.
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yottie (21 Jan 2012)
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ChrisFrost

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PostPosted: Sat Jan 21, 2012 3:00 pm Reply with quote

I'd definitely go with dismantling the case before you start spraying anything inside an amp. You want to get the fluid where it's needed rather than missing and just making a horrible gunky mess.

Contact Cleaner (A.K.A. switch cleaner is the stuff you want)
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yottie (21 Jan 2012)
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Sam Gangee

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PostPosted: Sat Jan 21, 2012 4:26 pm Reply with quote

He said it's a slider so it's easy to squirt WD-40 inside the potentiometer. Use it sparingly. No dismantling required. Should be good for a few more years.

I wouldn't use switch cleaner. It will remove all lubrication and make it worse in the long run. I don't even use it for cleaning switch contacts. They really need a film of grease or oil to prevent oxidation.
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wotan

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PostPosted: Sun Jan 22, 2012 2:43 am Reply with quote

In the past I have cured crackling volume controls, by dismantling and rubbing a soft pencil over the tracks, worked a treat.

Wotan
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yottie (22 Jan 2012)
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yottie

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Joined: 03 Jun 2007
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PostPosted: Sun Jan 22, 2012 12:16 pm Reply with quote

Many thanks Sam......WD40 works a treat !!

ADOPT,ADAPT,IMPROVE
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timtheenchanter

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Joined: 04 Jan 2006
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PostPosted: Tue Jan 24, 2012 3:27 pm Reply with quote

whats wrong with a switch cleaning lubricant then?



works well for me, I use this, and just normal IPA for other, non lubracative (is that even a word) , uses (which is all "switch cleaner" seems to be anyway
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yottie

from United Kingdom

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Location: Cumbria,
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PostPosted: Wed Jan 25, 2012 5:33 pm Reply with quote

I think I've used switch cleaner on this in the far past but as I can't find it at the moment I've used WD40 (which every-one has to hand !), it really has sorted the problem.
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Sam Gangee

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PostPosted: Wed Jan 25, 2012 7:21 pm Reply with quote

timtheenchanter wrote:
whats wrong with a switch cleaning lubricant then?

It's probably fine but it's generally not available locally (unless you have a "Maplin's" store nearby) so it's going to cost you between 3 and 5 plus postage. WD-40 at around the same price, dependent on can size, tends to be easier to obtain locally and most people have a can at home. It contains a petroleum based degreaser and a light oil.
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yottie

from United Kingdom

Joined: 03 Jun 2007
Posts: 324
Location: Cumbria,
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PostPosted: Wed Jan 25, 2012 9:18 pm Reply with quote

A local shop sells small aeros of WD for.....guess how much !
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