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Removing oxidation from valve pins

Time Audio said:
Think it depends on era and where manufactured.
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It's all the same metal. Octal valves have different metal used in their construction as the pins don't need to go through the glass.
Kovar is a special alloy which has the same coefficient of expansion as glass....
 
Arkless Repairs said:
It's all the same metal. Octal valves have different metal used in their construction as the pins don't need to go through the glass.
Kovar is a special alloy which has the same coefficient of expansion as glass....
Click to expand...

Maybe the pins themselves are same material...yeah it would have to be wetted by glass and not expand different rate etc - I know they use a different glass at the base than for the tube body itself...for this pin wetting etc

Moderns have a shiny plating for example. The old ones are dull grey metal. Some seem to have a build up of some nasty corrosion or whatever - esp if stored for ages... Think this is what we are talking about cleaning :)
 
i_should_coco said:
Generally a fibreglass pencil does the trick.
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A bit abrasive though and probably only a last resort if really bad.

The Silvo mentioned earlier was recommended by a friend in the trade and he was right :)
Not sure what chemicals are on the wadding but it does the trick on all kinds of electrical contacts. follow up with IPA as a final clean.
 
Mark Grant said:
A bit abrasive though and probably only a last resort if really bad.

The Silvo mentioned earlier was recommended by a friend in the trade and he was right :)
Not sure what chemicals are on the wadding but it does the trick on all kinds of electrical contacts. follow up with IPA as a final clean.
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Great. Thanks.:)
 
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