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Audio and Video Talk
The Vintage Audio Section
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<blockquote data-quote="Ampdog" data-source="post: 266694" data-attributes="member: 144"><p>All excellent stuff, but it depends on how 'unclean' the switch contacts are.</p><p></p><p>When we are talking of say pre 80s, some quite persistent coating can exist. I occasionally had to take pre-1970 switches apart and dunk it in (of all things) diluted Deoxidene! (Not longer than necessary!) I feel certain chemists will be able to recommend other stuff, but that might require making up. Dust-gathering might also be a problem with open components as said.</p><p></p><p>For potentiometers I occasionally resorted to moving the wipers a small distance to one side so as to make contact with an unused part of the track. (Tracks are often wide enough.) Sometimes wipers lost some 'springiness'; they hardly put any pressure on the track any more. It is a precision job though, requiring a steady hand, enough light and a magnifier.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 266694, member: 144"] All excellent stuff, but it depends on how 'unclean' the switch contacts are. When we are talking of say pre 80s, some quite persistent coating can exist. I occasionally had to take pre-1970 switches apart and dunk it in (of all things) diluted Deoxidene! (Not longer than necessary!) I feel certain chemists will be able to recommend other stuff, but that might require making up. Dust-gathering might also be a problem with open components as said. For potentiometers I occasionally resorted to moving the wipers a small distance to one side so as to make contact with an unused part of the track. (Tracks are often wide enough.) Sometimes wipers lost some 'springiness'; they hardly put any pressure on the track any more. It is a precision job though, requiring a steady hand, enough light and a magnifier. [/QUOTE]
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Audio and Video Talk
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