{Collins} Caig Laboratories contact cleaners



Greetings to Collins fans. Yes, some threads die hard. Concerned with the
ultimate longevity of S-line gear and the prospect of purchasing a unit that
may have been mistreated, I will offer a somewhat pointed opinion on the
subject. The rotary switches in S-line gear have phenolic insulation. Caig
laboratories clearly cautions one about using Deoxit D5 variants around
phenolic. If you can keep it on the contact material and immediately remove
spillover, fine. D5 variants are also not recommended for carbon element
potentiometers as they may actually dissolve some of the carbon. 
 

Here is a link that one of their applications engineers sent me to review
some germane Q and A:

 

http://store.caig.com/s.nl?sc=12
<http://store.caig.com/s.nl?sc=12&category=8&ctype=KB&KB=215&search=phenolic
> &category=8&ctype=KB&KB=215&search=phenolic

 

I too have used Deoxit D5 and D100 products successfully for quite a few
years. However, matching the chemical to the job is important. Fast
evaporating, residue free cleaners are what is called for on the rotary
switches.

 

Be careful about relay contacts too. The K1 and K2 relays used by Collins
through the years had different contact materials, each calling for a
different cleaning method - another subject.

 

Keep them running!

 

73

Bob

KF6BC



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