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 Post subject: Nikko 450 attenuator issues
PostPosted: Nov Thu 08, 2018 3:23 am 
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Joined: Nov Thu 08, 2018 3:06 am
Posts: 2
I have a late 1980 Nikko 450 alpha beta gamma integrated system built in equalizer that the attenuator crackles the speakers when I raise the volume can I repair my self or is it complicated


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 Post subject: Re: Nikko 450 attenuator issues
PostPosted: Nov Thu 08, 2018 3:09 pm 
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Joined: Jan Fri 02, 2009 11:32 pm
Posts: 618
Location: Equinunk PA 18417
http://www.antiqueradios.com/forums/viewtopic.php?t=99189
There are dozens more threads full of knowledge ready for your search.

It looks like the attenuator is a typical twist knob style with a circular potentiometer inside. Does the control crackle when turned even with silent audio? If it makes obvious "scratchy" sound even with no signal then there is current leakage through the potentiometer from aging capacitors. Those capacitors and the potentiometer that should be replaced. If the crackle is obvious only when audio is present, have a look inside. Many potentiometers of that era have an opening in their case where 3 electrical contacts are made. If yours is sealed up, the fix is to replace the potentiometer component with one of the same specifications. If yours has an opening around those contacts, a temporary fix can be made with a can of "contact cleaner". Squirt some in the opening then exercise the knob a few times, spray another squirt, exercise the knob again, then let it dry for 5-10 minutes. The crackles should be gone now but they will eventually return. You can spray again. A longer-term fix is to replace the potentiometer component.

I strongly recommend that you use proper contact cleaner. Those are designed to clean and flush away dirt without harming most plastics or paint. I use Caig Fader Lube when I want a lubricating residue left behind, or GC Chemicals Big Bath when I want no residue. Other products I know will do a good job are GC Chemicals Jiffy Bath and Caig Deoxit. I have heard that WD-40 branded "Specialist Electrical Contact Cleaner" is very good. There are many other products that should do the job too. You want something that will flush away dirt and then evaporate. Some products also leave behind a residue that is designed for wiper electrical contacts, which may help the temporary fix to last a bit longer. I would personally never use regular WD-40 but others say they do with good results. I do not like the oily residue it leaves behind.

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-Richard


Last edited by richfair on Nov Thu 08, 2018 3:19 pm, edited 1 time in total.

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 Post subject: Re: Nikko 450 attenuator issues
PostPosted: Nov Thu 08, 2018 3:18 pm 
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Joined: Nov Thu 08, 2018 3:06 am
Posts: 2
Thanks that what I thought was just curious as to how others would fix this issue


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